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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>irusist - 坚持是一种美德</title>
<link href="/atom.xml" rel="self"/>
<link href="http://irusist.github.io/"/>
<updated>2017-11-06T15:29:11.000Z</updated>
<id>http://irusist.github.io/</id>
<author>
<name>irusist</name>
</author>
<generator uri="http://hexo.io/">Hexo</generator>
<entry>
<title>Github语言排行[人工置顶]</title>
<link href="http://irusist.github.io/2100/01/01/Github%E8%AF%AD%E8%A8%80%E6%8E%92%E8%A1%8C/"/>
<id>http://irusist.github.io/2100/01/01/Github语言排行/</id>
<published>2099-12-31T16:00:01.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>以下内容是通过github api动态生成的, 生成时间: 2016年01月02日22时05分56秒</p><a id="more"></a><h2 id="Go语言排行"><a href="#Go语言排行" class="headerlink" title="Go语言排行"></a>Go语言排行</h2><ul><li>docker: <a href="https://github.com/docker/docker" target="_blank" rel="noopener">Docker - the open-source application container engine</a>, stars: 27443</li><li>go: <a href="https://github.com/golang/go" target="_blank" rel="noopener">The Go programming language</a>, stars: 13394</li><li>kubernetes: <a href="https://github.com/kubernetes/kubernetes" target="_blank" rel="noopener">Container Cluster Manager from Google</a>, stars: 11933</li><li>syncthing: <a href="https://github.com/syncthing/syncthing" target="_blank" rel="noopener">Open Source Continuous File Synchronization</a>, stars: 10791</li><li>awesome-go: <a href="https://github.com/avelino/awesome-go" target="_blank" rel="noopener">A curated list of awesome Go frameworks, libraries and software</a>, stars: 10420</li><li>gogs: <a href="https://github.com/gogits/gogs" target="_blank" rel="noopener">Gogs (Go Git Service) is a painless self-hosted Git service.</a>, stars: 10332</li><li>lantern: <a href="https://github.com/getlantern/lantern" target="_blank" rel="noopener">:zap: Open Internet for everyone. Lantern is a free desktop application that delivers fast, reliable and secure access to the open Internet for users in censored regions. It uses a variety of techniques to stay unblocked, including P2P and domain fronting. Lantern relies on users in uncensored regions acting as access points to the open Internet.</a>, stars: 9147</li><li>build-web-application-with-golang: <a href="https://github.com/astaxie/build-web-application-with-golang" target="_blank" rel="noopener">A golang ebook intro how to build a web with golang</a>, stars: 8843</li><li>etcd: <a href="https://github.com/coreos/etcd" target="_blank" rel="noopener">Distributed reliable key-value store for the most critical data of a distributed system</a>, stars: 8347</li><li>martini: <a href="https://github.com/go-martini/martini" target="_blank" rel="noopener">Classy web framework for Go</a>, stars: 8078</li><li>hub: <a href="https://github.com/github/hub" target="_blank" rel="noopener">hub helps you win at git.</a>, stars: 7805</li><li>hugo: <a href="https://github.com/spf13/hugo" target="_blank" rel="noopener">A Fast and Flexible Static Site Generator built with love by spf13 in GoLang</a>, stars: 7717</li><li>influxdb: <a href="https://github.com/influxdb/influxdb" target="_blank" rel="noopener">Scalable datastore for metrics, events, and real-time analytics</a>, stars: 7074</li><li>cayley: <a href="https://github.com/google/cayley" target="_blank" rel="noopener">An open-source graph database</a>, stars: 6721</li><li>websocketd: <a href="https://github.com/joewalnes/websocketd" target="_blank" rel="noopener">Turn any program that uses STDIN/STDOUT into a WebSocket server. Like inetd, but for WebSockets. </a>, stars: 6703</li><li>ngrok: <a href="https://github.com/inconshreveable/ngrok" target="_blank" rel="noopener">Introspected tunnels to localhost</a>, stars: 6289</li><li>revel: <a href="https://github.com/revel/revel" target="_blank" rel="noopener">A high productivity, full-stack web framework for the Go language.</a>, stars: 6188</li><li>nsq: <a href="https://github.com/nsqio/nsq" target="_blank" rel="noopener">A realtime distributed messaging platform</a>, stars: 6015</li><li>gotty: <a href="https://github.com/yudai/gotty" target="_blank" rel="noopener">Share your terminal as a web application</a>, stars: 6004</li><li>cockroach: <a href="https://github.com/cockroachdb/cockroach" target="_blank" rel="noopener">A Scalable, Survivable, Strongly-Consistent SQL Database</a>, stars: 5971</li><li>drone: <a href="https://github.com/drone/drone" target="_blank" rel="noopener">Drone is a Continuous Integration platform built on Docker, written in Go</a>, stars: 5948</li><li>beego: <a href="https://github.com/astaxie/beego" target="_blank" rel="noopener">beego is an open-source, high-performance web framework for the Go programming language.</a>, stars: 5842</li><li>consul: <a href="https://github.com/hashicorp/consul" target="_blank" rel="noopener">Consul is a tool for service discovery, monitoring and configuration.</a>, stars: 5300</li><li>gin: <a href="https://github.com/gin-gonic/gin" target="_blank" rel="noopener">Gin is a HTTP web framework written in Go (Golang). It features a Martini-like API with much better performance – up to 40 times faster. If you need smashing performance, get yourself some Gin.</a>, stars: 5079</li><li>rkt: <a href="https://github.com/coreos/rkt" target="_blank" rel="noopener">rkt is an App Container runtime for Linux</a>, stars: 4976</li><li>packer: <a href="https://github.com/mitchellh/packer" target="_blank" rel="noopener">Packer is a tool for creating identical machine images for multiple platforms from a single source configuration.</a>, stars: 4846</li><li>gor: <a href="https://github.com/buger/gor" target="_blank" rel="noopener">Gor is an open-source tool for capturing and replaying live HTTP traffic into a test environment in order to continuously test your system with real data. It can be used to increase confidence in code deployments, configuration changes and infrastructure changes.</a>, stars: 4464</li><li>termui: <a href="https://github.com/gizak/termui" target="_blank" rel="noopener">Golang terminal dashboard</a>, stars: 4204</li><li>flynn: <a href="https://github.com/flynn/flynn" target="_blank" rel="noopener">A next generation open source platform as a service (PaaS)</a>, stars: 4143</li><li>groupcache: <a href="https://github.com/golang/groupcache" target="_blank" rel="noopener">groupcache is a caching and cache-filling library, intended as a replacement for memcached in many cases.</a>, stars: 4105</li></ul><h2 id="JavaScript语言排行"><a href="#JavaScript语言排行" class="headerlink" title="JavaScript语言排行"></a>JavaScript语言排行</h2><ul><li>FreeCodeCamp: <a href="https://github.com/FreeCodeCamp/FreeCodeCamp" target="_blank" rel="noopener">The http://FreeCodeCamp.com open source codebase and curriculum. Learn to code and help nonprofits.</a>, stars: 51482</li><li>angular.js: <a href="https://github.com/angular/angular.js" target="_blank" rel="noopener">HTML enhanced for web apps</a>, stars: 45619</li><li>d3: <a href="https://github.com/mbostock/d3" target="_blank" rel="noopener">A JavaScript visualization library for HTML and SVG.</a>, stars: 45030</li><li>jquery: <a href="https://github.com/jquery/jquery" target="_blank" rel="noopener">jQuery JavaScript Library</a>, stars: 37372</li><li>react: <a href="https://github.com/facebook/react" target="_blank" rel="noopener">A declarative, efficient, and flexible JavaScript library for building user interfaces.</a>, stars: 33959</li><li>html5-boilerplate: <a href="https://github.com/h5bp/html5-boilerplate" target="_blank" rel="noopener">A professional front-end template for building fast, robust, and adaptable web apps or sites.</a>, stars: 32280</li><li>meteor: <a href="https://github.com/meteor/meteor" target="_blank" rel="noopener">Meteor, the JavaScript App Platform</a>, stars: 31002</li><li>javascript: <a href="https://github.com/airbnb/javascript" target="_blank" rel="noopener">JavaScript Style Guide</a>, stars: 28096</li><li>impress.js: <a href="https://github.com/impress/impress.js" target="_blank" rel="noopener">It’s a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com.</a>, stars: 26178</li><li>reveal.js: <a href="https://github.com/hakimel/reveal.js" target="_blank" rel="noopener">The HTML Presentation Framework</a>, stars: 25512</li><li>react-native: <a href="https://github.com/facebook/react-native" target="_blank" rel="noopener">A framework for building native apps with React.</a>, stars: 24841</li><li>You-Dont-Know-JS: <a href="https://github.com/getify/You-Dont-Know-JS" target="_blank" rel="noopener">A book series on JavaScript. @YDKJS on twitter.</a>, stars: 24667</li><li>brackets: <a href="https://github.com/adobe/brackets" target="_blank" rel="noopener">An open source code editor for the web, written in JavaScript, HTML and CSS.</a>, stars: 24293</li><li>moment: <a href="https://github.com/moment/moment" target="_blank" rel="noopener">Parse, validate, manipulate, and display dates in javascript.</a>, stars: 24026</li><li>backbone: <a href="https://github.com/jashkenas/backbone" target="_blank" rel="noopener">Give your JS App some Backbone with Models, Views, Collections, and Events</a>, stars: 23799</li><li>three.js: <a href="https://github.com/mrdoob/three.js" target="_blank" rel="noopener">JavaScript 3D library.</a>, stars: 22678</li><li>jQuery-File-Upload: <a href="https://github.com/blueimp/jQuery-File-Upload" target="_blank" rel="noopener">File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.</a>, stars: 22331</li><li>express: <a href="https://github.com/strongloop/express" target="_blank" rel="noopener">Fast, unopinionated, minimalist web framework for node.</a>, stars: 22311</li><li>Semantic-UI: <a href="https://github.com/Semantic-Org/Semantic-UI" target="_blank" rel="noopener">Semantic is a UI component framework based around useful principles from natural language.</a>, stars: 22222</li><li>foundation-sites: <a href="https://github.com/zurb/foundation-sites" target="_blank" rel="noopener">The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites that work on any kind of device.</a>, stars: 22149</li><li>socket.io: <a href="https://github.com/socketio/socket.io" target="_blank" rel="noopener">Realtime application framework (Node.JS server)</a>, stars: 21919</li><li>ionic: <a href="https://github.com/driftyco/ionic" target="_blank" rel="noopener">Advanced HTML5 mobile development framework and SDK. Build incredible mobile apps with web technologies you already know and love. Best friends with AngularJS.</a>, stars: 21289</li><li>resume.github.com: <a href="https://github.com/resume/resume.github.com" target="_blank" rel="noopener">Resumes generated using the GitHub informations</a>, stars: 20310</li><li>hacker-scripts: <a href="https://github.com/NARKOZ/hacker-scripts" target="_blank" rel="noopener">Based on a true story</a>, stars: 19866</li><li>node: <a href="https://github.com/nodejs/node" target="_blank" rel="noopener">Node.js JavaScript runtime :sparkles::turtle::rocket::sparkles:</a>, stars: 18774</li><li>gulp: <a href="https://github.com/gulpjs/gulp" target="_blank" rel="noopener">The streaming build system</a>, stars: 18427</li><li>Ghost: <a href="https://github.com/TryGhost/Ghost" target="_blank" rel="noopener">Just a blogging platform</a>, stars: 18023</li><li>Chart.js: <a href="https://github.com/nnnick/Chart.js" target="_blank" rel="noopener">Simple HTML5 Charts using the <canvas> tag</canvas></a>, stars: 17621</li><li>Modernizr: <a href="https://github.com/Modernizr/Modernizr" target="_blank" rel="noopener">Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.</a>, stars: 16991</li><li>underscore: <a href="https://github.com/jashkenas/underscore" target="_blank" rel="noopener">JavaScript’s utility _ belt</a>, stars: 16882</li></ul><h2 id="Scala语言排行"><a href="#Scala语言排行" class="headerlink" title="Scala语言排行"></a>Scala语言排行</h2><ul><li>PredictionIO: <a href="https://github.com/PredictionIO/PredictionIO" target="_blank" rel="noopener">PredictionIO, a machine learning server for developers and ML engineers. Built on Apache Spark, HBase and Spray.</a>, stars: 8292</li><li>playframework: <a href="https://github.com/playframework/playframework" target="_blank" rel="noopener">Play Framework</a>, stars: 7239</li><li>spark: <a href="https://github.com/apache/spark" target="_blank" rel="noopener">Mirror of Apache Spark</a>, stars: 6771</li><li>scala: <a href="https://github.com/scala/scala" target="_blank" rel="noopener">The Scala programming language</a>, stars: 5377</li><li>gitbucket: <a href="https://github.com/gitbucket/gitbucket" target="_blank" rel="noopener">A GitHub clone powered by Scala which has easy installation and high extensibility</a>, stars: 5027</li><li>akka: <a href="https://github.com/akka/akka" target="_blank" rel="noopener">Akka Project</a>, stars: 4902</li><li>ArnoldC: <a href="https://github.com/lhartikk/ArnoldC" target="_blank" rel="noopener">Arnold Schwarzenegger based programming language</a>, stars: 4245</li><li>finagle: <a href="https://github.com/twitter/finagle" target="_blank" rel="noopener">A fault tolerant, protocol-agnostic RPC system</a>, stars: 4135</li><li>zipkin: <a href="https://github.com/openzipkin/zipkin" target="_blank" rel="noopener">Zipkin is a distributed tracing system</a>, stars: 2941</li><li>kestrel: <a href="https://github.com/twitter-archive/kestrel" target="_blank" rel="noopener">simple, distributed message queue system (inactive)</a>, stars: 2721</li><li>flockdb: <a href="https://github.com/twitter/flockdb" target="_blank" rel="noopener">A distributed, fault-tolerant graph database</a>, stars: 2709</li><li>sbt: <a href="https://github.com/sbt/sbt" target="_blank" rel="noopener">sbt, a build tool for Scala</a>, stars: 2454</li><li>snowplow: <a href="https://github.com/snowplow/snowplow" target="_blank" rel="noopener">Enterprise-strength web, mobile and event analytics, powered by Hadoop, Kinesis, Redshift and Elasticsearch</a>, stars: 2416</li><li>diffy: <a href="https://github.com/twitter/diffy" target="_blank" rel="noopener">Find potential bugs in your services with Diffy</a>, stars: 2399</li><li>scalding: <a href="https://github.com/twitter/scalding" target="_blank" rel="noopener">A Scala API for Cascading</a>, stars: 2381</li><li>snowflake: <a href="https://github.com/twitter/snowflake" target="_blank" rel="noopener">Snowflake is a network service for generating unique ID numbers at high scale with some simple guarantees.</a>, stars: 2294</li><li>scalaz: <a href="https://github.com/scalaz/scalaz" target="_blank" rel="noopener">An extension to the core Scala library for functional programming.</a>, stars: 2275</li><li>gatling: <a href="https://github.com/gatling/gatling" target="_blank" rel="noopener">Async Scala-Akka-Netty based Load Test Tool</a>, stars: 2195</li><li>spray: <a href="https://github.com/spray/spray" target="_blank" rel="noopener">A suite of scala libraries for building and consuming RESTful web services on top of Akka: lightweight, asynchronous, non-blocking, actor-based, testable</a>, stars: 2183</li><li>marathon: <a href="https://github.com/mesosphere/marathon" target="_blank" rel="noopener">Deploy and manage containers (including Docker) on top of Apache Mesos at scale.</a>, stars: 2114</li><li>scala-js: <a href="https://github.com/scala-js/scala-js" target="_blank" rel="noopener">Scala.js, the Scala to JavaScript compiler</a>, stars: 2055</li><li>gizzard: <a href="https://github.com/twitter/gizzard" target="_blank" rel="noopener">A flexible sharding framework for creating eventually-consistent distributed datastores</a>, stars: 2026</li><li>fpinscala: <a href="https://github.com/fpinscala/fpinscala" target="_blank" rel="noopener">Code, exercises, answers, and hints to go along with the book “Functional Programming in Scala”</a>, stars: 1931</li><li>scaloid: <a href="https://github.com/pocorall/scaloid" target="_blank" rel="noopener">Scaloid makes your Android code easy to understand and maintain.</a>, stars: 1847</li><li>scalatra: <a href="https://github.com/scalatra/scalatra" target="_blank" rel="noopener">Tiny Scala high-performance, async web framework, inspired by Sinatra</a>, stars: 1827</li><li>textteaser: <a href="https://github.com/MojoJolo/textteaser" target="_blank" rel="noopener">TextTeaser is an automatic summarization algorithm.</a>, stars: 1780</li><li>kafka-manager: <a href="https://github.com/yahoo/kafka-manager" target="_blank" rel="noopener">A tool for managing Apache Kafka.</a>, stars: 1714</li><li>bfg-repo-cleaner: <a href="https://github.com/rtyley/bfg-repo-cleaner" target="_blank" rel="noopener">Removes large or troublesome blobs like git-filter-branch does, but faster. And written in Scala</a>, stars: 1681</li><li>lila: <a href="https://github.com/ornicar/lila" target="_blank" rel="noopener">The forever free, adless and open source chess server.</a>, stars: 1666</li><li>summingbird: <a href="https://github.com/twitter/summingbird" target="_blank" rel="noopener">Streaming MapReduce with Scalding and Storm</a>, stars: 1660</li></ul><h2 id="Java语言排行"><a href="#Java语言排行" class="headerlink" title="Java语言排行"></a>Java语言排行</h2><ul><li>elasticsearch: <a href="https://github.com/elastic/elasticsearch" target="_blank" rel="noopener">Open Source, Distributed, RESTful Search Engine</a>, stars: 14203</li><li>Android-Universal-Image-Loader: <a href="https://github.com/nostra13/Android-Universal-Image-Loader" target="_blank" rel="noopener">Powerful and flexible library for loading, caching and displaying images on Android.</a>, stars: 11399</li><li>RxJava: <a href="https://github.com/ReactiveX/RxJava" target="_blank" rel="noopener">RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.</a>, stars: 9770</li><li>iosched: <a href="https://github.com/google/iosched" target="_blank" rel="noopener">The Google I/O 2015 Android App</a>, stars: 9570</li><li>java-design-patterns: <a href="https://github.com/iluwatar/java-design-patterns" target="_blank" rel="noopener">Design patterns implemented in Java</a>, stars: 9412</li><li>retrofit: <a href="https://github.com/square/retrofit" target="_blank" rel="noopener">Type-safe HTTP client for Android and Java by Square, Inc.</a>, stars: 8976</li><li>SlidingMenu: <a href="https://github.com/jfeinstein10/SlidingMenu" target="_blank" rel="noopener">An Android library that allows you to easily create applications with slide-in menus. You may use it in your Android apps provided that you cite this project and include the license in your app. Thanks!</a>, stars: 8759</li><li>storm: <a href="https://github.com/nathanmarz/storm" target="_blank" rel="noopener">Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more</a>, stars: 8746</li><li>picasso: <a href="https://github.com/square/picasso" target="_blank" rel="noopener">A powerful image downloading and caching library for Android</a>, stars: 8383</li><li>okhttp: <a href="https://github.com/square/okhttp" target="_blank" rel="noopener">An HTTP+SPDY client for Android and Java applications.</a>, stars: 8089</li><li>android-async-http: <a href="https://github.com/loopj/android-async-http" target="_blank" rel="noopener">An Asynchronous HTTP Library for Android</a>, stars: 8006</li><li>libgdx: <a href="https://github.com/libgdx/libgdx" target="_blank" rel="noopener">Desktop/Android/HTML5/iOS Java game development framework</a>, stars: 7668</li><li>EventBus: <a href="https://github.com/greenrobot/EventBus" target="_blank" rel="noopener">Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.</a>, stars: 7569</li><li>android-best-practices: <a href="https://github.com/futurice/android-best-practices" target="_blank" rel="noopener">Do’s and Don’ts for Android development, by Futurice developers</a>, stars: 7556</li><li>spring-framework: <a href="https://github.com/spring-projects/spring-framework" target="_blank" rel="noopener">The Spring Framework</a>, stars: 7418</li><li>fresco: <a href="https://github.com/facebook/fresco" target="_blank" rel="noopener">An Android library for managing images and the memory they use.</a>, stars: 7393</li><li>zxing: <a href="https://github.com/zxing/zxing" target="_blank" rel="noopener">Official ZXing (“Zebra Crossing”) project home</a>, stars: 7237</li><li>ActionBarSherlock: <a href="https://github.com/JakeWharton/ActionBarSherlock" target="_blank" rel="noopener">[DEPRECATED] Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.</a>, stars: 7160</li><li>leakcanary: <a href="https://github.com/square/leakcanary" target="_blank" rel="noopener">A memory leak detection library for Android and Java.</a>, stars: 6806</li><li>guava: <a href="https://github.com/google/guava" target="_blank" rel="noopener">Google Core Libraries for Java 6+</a>, stars: 6799</li><li>butterknife: <a href="https://github.com/JakeWharton/butterknife" target="_blank" rel="noopener">View “injection” library for Android.</a>, stars: 6729</li><li>androidannotations: <a href="https://github.com/excilys/androidannotations" target="_blank" rel="noopener">Fast Android Development. Easy maintainance.</a>, stars: 6714</li><li>MPAndroidChart: <a href="https://github.com/PhilJay/MPAndroidChart" target="_blank" rel="noopener">A powerful Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.</a>, stars: 6668</li><li>ViewPagerIndicator: <a href="https://github.com/JakeWharton/ViewPagerIndicator" target="_blank" rel="noopener">Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock.</a>, stars: 6667</li><li>HomeMirror: <a href="https://github.com/HannahMitt/HomeMirror" target="_blank" rel="noopener">Android application powering the mirror in my house</a>, stars: 6286</li><li>Android-PullToRefresh: <a href="https://github.com/chrisbanes/Android-PullToRefresh" target="_blank" rel="noopener">DEPRECATED</a>, stars: 6151</li><li>glide: <a href="https://github.com/bumptech/glide" target="_blank" rel="noopener">An image loading and caching library for Android focused on smooth scrolling</a>, stars: 6115</li><li>netty: <a href="https://github.com/netty/netty" target="_blank" rel="noopener">Netty project - an event-driven asynchronous network application framework</a>, stars: 5865</li><li>MaterialDesignLibrary: <a href="https://github.com/navasmdc/MaterialDesignLibrary" target="_blank" rel="noopener">This is a library with components of Android L to you use in android 2.2</a>, stars: 5848</li><li>PhotoView: <a href="https://github.com/chrisbanes/PhotoView" target="_blank" rel="noopener">Implementation of ImageView for Android that supports zooming, by various touch gestures.</a>, stars: 5077</li></ul><h2 id="C语言排行"><a href="#C语言排行" class="headerlink" title="C语言排行"></a>C语言排行</h2><ul><li>linux: <a href="https://github.com/torvalds/linux" target="_blank" rel="noopener">Linux kernel source tree</a>, stars: 28635</li><li>redis: <a href="https://github.com/antirez/redis" target="_blank" rel="noopener">Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, HyperLogLogs, Bitmaps.</a>, stars: 16124</li><li>git: <a href="https://github.com/git/git" target="_blank" rel="noopener">Git Source Code Mirror - This is a publish-only repository and all pull requests are ignored. Please follow Documentation/SubmittingPatches procedure for any of your improvements.</a>, stars: 11343</li><li>How-to-Make-a-Computer-Operating-System: <a href="https://github.com/SamyPesse/How-to-Make-a-Computer-Operating-System" target="_blank" rel="noopener">How to Make a Computer Operating System in C++</a>, stars: 9704</li><li>emscripten: <a href="https://github.com/kripken/emscripten" target="_blank" rel="noopener">Emscripten: An LLVM-to-JavaScript Compiler</a>, stars: 9374</li><li>php-src: <a href="https://github.com/php/php-src" target="_blank" rel="noopener">The PHP Interpreter</a>, stars: 8394</li><li>the_silver_searcher: <a href="https://github.com/ggreer/the_silver_searcher" target="_blank" rel="noopener">A code-searching tool similar to ack, but faster.</a>, stars: 7749</li><li>toxcore: <a href="https://github.com/irungentoo/toxcore" target="_blank" rel="noopener">The future of online communications.</a>, stars: 7574</li><li>The-Art-Of-Programming-By-July: <a href="https://github.com/julycoding/The-Art-Of-Programming-By-July" target="_blank" rel="noopener">本github已于14年6月基本停止更新，完整精致的纸质版《编程之法：面试和算法心得》已在京东/当当上销售！</a>, stars: 7552</li><li>wrk: <a href="https://github.com/wg/wrk" target="_blank" rel="noopener">Modern HTTP benchmarking tool</a>, stars: 7243</li><li>jq: <a href="https://github.com/stedolan/jq" target="_blank" rel="noopener">Command-line JSON processor</a>, stars: 5828</li><li>libgit2: <a href="https://github.com/libgit2/libgit2" target="_blank" rel="noopener">The Library</a>, stars: 5396</li><li>Signal-Android: <a href="https://github.com/WhisperSystems/Signal-Android" target="_blank" rel="noopener">A private messenger for Android.</a>, stars: 5360</li><li>h2o: <a href="https://github.com/h2o/h2o" target="_blank" rel="noopener">H2O - the optimized HTTP/1, HTTP/2 server</a>, stars: 5233</li><li>macvim: <a href="https://github.com/b4winckler/macvim" target="_blank" rel="noopener">Vim - the text editor - for Mac OS X</a>, stars: 5169</li><li>fish-shell: <a href="https://github.com/fish-shell/fish-shell" target="_blank" rel="noopener">The user-friendly command line shell.</a>, stars: 5137</li><li>firefox-ios: <a href="https://github.com/mozilla/firefox-ios" target="_blank" rel="noopener">Firefox for iOS</a>, stars: 5136</li><li>ccv: <a href="https://github.com/liuliu/ccv" target="_blank" rel="noopener">C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library</a>, stars: 4954</li><li>godot: <a href="https://github.com/godotengine/godot" target="_blank" rel="noopener">Godot Game Engine</a>, stars: 4943</li><li>twemproxy: <a href="https://github.com/twitter/twemproxy" target="_blank" rel="noopener">A fast, light-weight proxy for memcached and redis</a>, stars: 4870</li><li>WinObjC: <a href="https://github.com/Microsoft/WinObjC" target="_blank" rel="noopener">Objective-C for Windows</a>, stars: 4844</li><li>mjolnir: <a href="https://github.com/sdegutis/mjolnir" target="_blank" rel="noopener">Lightweight automation and productivity app for OS X</a>, stars: 4760</li><li>robotjs: <a href="https://github.com/octalmage/robotjs" target="_blank" rel="noopener">Node.js Desktop Automation. </a>, stars: 4501</li><li>memcached: <a href="https://github.com/memcached/memcached" target="_blank" rel="noopener">memcached development tree</a>, stars: 4184</li><li>Telegram: <a href="https://github.com/DrKLO/Telegram" target="_blank" rel="noopener">Telegram for Android source</a>, stars: 4138</li><li>disque: <a href="https://github.com/antirez/disque" target="_blank" rel="noopener">Disque is a distributed message broker</a>, stars: 4076</li><li>masscan: <a href="https://github.com/robertdavidgraham/masscan" target="_blank" rel="noopener">TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.</a>, stars: 4017</li><li>grpc: <a href="https://github.com/grpc/grpc" target="_blank" rel="noopener">The C based gRPC (C++, Node.js, Python, Ruby, Objective-C, PHP, C#)</a>, stars: 3895</li><li>tengine: <a href="https://github.com/alibaba/tengine" target="_blank" rel="noopener">A distribution of Nginx with some advanced features</a>, stars: 3766</li><li>streem: <a href="https://github.com/matz/streem" target="_blank" rel="noopener">prototype of stream based programming language</a>, stars: 3742</li></ul>]]></content>
<summary type="html">
Github语言排行
</summary>
<category term="github" scheme="http://irusist.github.io/categories/github/"/>
<category term="github" scheme="http://irusist.github.io/tags/github/"/>
<category term="语言" scheme="http://irusist.github.io/tags/%E8%AF%AD%E8%A8%80/"/>
</entry>
<entry>
<title>Java的一些内存泄露</title>
<link href="http://irusist.github.io/2017/11/27/Java%E7%9A%84%E4%B8%80%E4%BA%9B%E5%86%85%E5%AD%98%E6%B3%84%E9%9C%B2/"/>
<id>http://irusist.github.io/2017/11/27/Java的一些内存泄露/</id>
<published>2017-11-26T16:00:00.000Z</published>
<updated>2017-12-23T10:18:54.000Z</updated>
<content type="html"><![CDATA[<p>最近有个后台项目开发环境报OOM， 最后利用mat分析出具体原因是，在开发环境，开发人员为了方便，用jboss的热部署来部署更新完的war包，重新部署后，会reload spring的容器类，但是有的类实例不能被卸载，导致有多个实例，之前存在的实例的定时任务一直在执行，最后导致OOM。 于是分析了具体不能被卸载的类，主要有以下2种情况：</p><ul class="org-ul"><li>存在定时任务没有被停止，造成有活跃的Thread，由于被根对象引用，造成不能被回收</li><li>实例被静态单例的类实例引用，如果要回收这个实例，必须回收Class对象，但是Class对象ClassLoader引用，而ClassLoader不能被回收的话，造成静态实例不能被回收。</li></ul><a id="more"></a><p>以下用测试程序说明下：</p><div id="outline-container-sec-1" class="outline-2"><h2 id="sec-1">定时任务没有被停止</h2><div class="outline-text-2" id="text-1"></div><div id="outline-container-sec-1-1" class="outline-3"><h3 id="sec-1-1">修改之前</h3><div class="outline-text-3" id="text-1-1"><p>类对象</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TimerLeak</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Timer timer = <span class="keyword">new</span> Timer();</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">TimerLeak</span><span class="params">()</span> </span>{</span><br><span class="line">timer.schedule(<span class="keyword">new</span> TimerTask() {</span><br><span class="line"> <span class="annotation">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line">}, <span class="number">0</span>, <span class="number">5000</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>加载Spring Bean并reload</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line">ClassPathXmlApplicationContext ctx = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">"appContext.xml"</span>);</span><br><span class="line">ctx.getBean(<span class="string">"timerLeak"</span>);</span><br><span class="line">ctx.refresh();</span><br><span class="line">Thread.currentThread().join();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>mat分析dump得到如下</p><div class="figure"><p><img src="TimerLeakBefore.png" alt="TimerLeakBefore.png"></p></div><p>查看被哪个根路径引用</p><div class="figure"><p><img src="TimerLeakBeforeRootPath.png" alt="TimerLeakBeforeRootPath.png"></p></div></div></div><div id="outline-container-sec-1-2" class="outline-3"><h3 id="sec-1-2">修改之后</h3><div class="outline-text-3" id="text-1-2"><p>类对象</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TimerLeak</span> <span class="keyword">implements</span> <span class="title">DisposableBean</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Timer timer = <span class="keyword">new</span> Timer();</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">TimerLeak</span><span class="params">()</span> </span>{</span><br><span class="line">timer.schedule(<span class="keyword">new</span> TimerTask() {</span><br><span class="line"> <span class="annotation">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line">}, <span class="number">0</span>, <span class="number">5000</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="annotation">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line">timer.cancel();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>mat分析dump得到如下</p><div class="figure"><p><img src="TimerLeakAfter.png" alt="TimerLeakAfter.png"></p></div></div></div></div><div id="outline-container-sec-2" class="outline-2"><h2 id="sec-2">静态类实例引用</h2><div class="outline-text-2" id="text-2"></div><div id="outline-container-sec-2-1" class="outline-3"><h3 id="sec-2-1">修改之前</h3><div class="outline-text-3" id="text-2-1"><p>类对象</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StaticContainerLeak</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"><span class="keyword">return</span> <span class="string">"test"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StaticContainer</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> Map<String, StaticContainerLeak> map = <span class="keyword">new</span> HashMap<>();</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">addData</span><span class="params">(StaticContainerLeak containerLeak)</span> </span>{</span><br><span class="line">map.put(containerLeak.getName(), containerLeak);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>reload spring的类</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line">ClassPathXmlApplicationContext ctx = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">"appContext.xml"</span>);</span><br><span class="line">StaticContainer.addData(ctx.getBean(<span class="string">"staticContainerLeak"</span>, StaticContainerLeak.class));</span><br><span class="line">ctx.refresh();</span><br><span class="line">Thread.currentThread().join();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>mat分析dump得到如下</p><div class="figure"><p><img src="StaticContainerLeakBefore.png" alt="StaticContainerLeakBefore.png"></p></div><p>查看被哪个根路径引用</p><div class="figure"><p><img src="StaticContainerLeakBeforeRootPath.png" alt="StaticContainerLeakBeforeRootPath.png"></p></div></div></div><div id="outline-container-sec-2-2" class="outline-3"><h3 id="sec-2-2">修改之后</h3><div class="outline-text-3" id="text-2-2"><p>类对象</p><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StaticContainer</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> Map<String, StaticContainerLeak> map = <span class="keyword">new</span> HashMap<>();</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">addData</span><span class="params">(StaticContainerLeak containerLeak)</span> </span>{</span><br><span class="line">map.put(containerLeak.getName(), containerLeak);</span><br><span class="line"> }</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">clear</span><span class="params">()</span> </span>{</span><br><span class="line">map.clear();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><div class="org-src-container"><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SpringContextDestory</span> <span class="keyword">implements</span> <span class="title">DisposableBean</span> </span>{</span><br><span class="line"> <span class="annotation">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line">StaticContainer.clear();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><p>mat分析dump得到如下</p><div class="figure"><p><img src="StaticContainerLeakAfter.png" alt="StaticContainerLeakAfter.png"></p></div><p>因此在开发时，尤其是中间件等框架，要注意：</p><ul class="org-ul"><li>对象销毁时需要停止定时任务， 以及设置相关变量的值</li><li>对引用外部实例的API，尤其注意要销毁清除</li></ul></div></div></div>]]></content>
<summary type="html">
<p>
最近有个后台项目开发环境报OOM， 最后利用mat分析出具体原因是，在开发环境，开发人员为了方便，用jboss的热部署来部署更新完的war包，重新部署后，会reload spring的容器类，
但是有的类实例不能被卸载，导致有多个实例，之前存在的实例的定时任务一直在执行，最后导致OOM。 于是分析了具体不能被卸载的类，主要有以下2种情况：
</p>
<ul class="org-ul">
<li>存在定时任务没有被停止，造成有活跃的Thread，由于被根对象引用，造成不能被回收
</li>
<li>实例被静态单例的类实例引用，如果要回收这个实例，必须回收Class对象，但是Class对象ClassLoader引用，而ClassLoader不能被回收的话，造成静态实例不能被回收。
</li>
</ul>
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java mat" scheme="http://irusist.github.io/tags/Java-mat/"/>
</entry>
<entry>
<title>我的投资记录</title>
<link href="http://irusist.github.io/2017/11/11/%E6%88%91%E7%9A%84%E6%8A%95%E8%B5%84%E8%AE%B0%E5%BD%95/"/>
<id>http://irusist.github.io/2017/11/11/我的投资记录/</id>
<published>2017-11-10T16:00:00.000Z</published>
<updated>2018-01-20T04:16:53.000Z</updated>
<content type="html"><![CDATA[<p>今年6月份开始接触投资，发现一片新的广阔天地，不断学习中，将以后投资的情况记录到这里</p><a id="more"></a><div id="outline-container-sec-1" class="outline-2"><h2 id="sec-1">定投</h2><div class="outline-text-2" id="text-1"><p>以下是刚开始不懂，看网上说定投300,500，创业板指数， 就做的一些定投</p></div><div id="outline-container-sec-1-1" class="outline-3"><h3 id="sec-1-1">沪深300</h3><div class="outline-text-3" id="text-1-1"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-06-01</td><td class="right">000961</td><td class="left">天弘沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.0135</td><td class="right">88.71</td><td class="right">0.09</td><td class="right">90</td><td class="right">22.06</td><td class="right">49.09%</td><td class="left"> </td></tr><tr><td class="right">2017-06-08</td><td class="right">110020</td><td class="left">易方达沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.1843</td><td class="right">151.80</td><td class="right">0.22</td><td class="right">180</td><td class="right">22.28</td><td class="right">50.45%</td><td class="left"> </td></tr><tr><td class="right">2017-06-15</td><td class="right">110020</td><td class="left">易方达沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.1773</td><td class="right">152.71</td><td class="right">0.22</td><td class="right">180</td><td class="right">21.73</td><td class="right">47.99%</td><td class="left"> </td></tr><tr><td class="right">2017-06-22</td><td class="right">110020</td><td class="left">易方达沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.1984</td><td class="right">150.02</td><td class="right">0.22</td><td class="right">180</td><td class="right">21.95</td><td class="right">48.80%</td><td class="left"> </td></tr><tr><td class="right">2017-06-29</td><td class="right">110020</td><td class="left">易方达沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.2234</td><td class="right">146.95</td><td class="right">0.22</td><td class="right">180</td><td class="right">22.33</td><td class="right">50.82%</td><td class="left"> </td></tr><tr><td class="right">2017-07-06</td><td class="right">110020</td><td class="left">易方达沪深300指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.2231</td><td class="right">146.99</td><td class="right">0.22</td><td class="right">180</td><td class="right">22.40</td><td class="right">51.55%</td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-1-2" class="outline-3"><h3 id="sec-1-2">创业板指数</h3><div class="outline-text-3" id="text-1-2"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-06-01</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.6890</td><td class="right">260.99</td><td class="right">0.18</td><td class="right">180</td><td class="right">44.46</td><td class="right">24.40%</td><td class="left"> </td></tr><tr><td class="right">2017-06-08</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7162</td><td class="right">948.51</td><td class="right">0.68</td><td class="right">680</td><td class="right">45.49</td><td class="right">26.85%</td><td class="left"> </td></tr><tr><td class="right">2017-06-15</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7250</td><td class="right">936.99</td><td class="right">0.68</td><td class="right">680</td><td class="right">45.32</td><td class="right">26.54%</td><td class="left"> </td></tr><tr><td class="right">2017-06-22</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7188</td><td class="right">945.08</td><td class="right">0.68</td><td class="right">680</td><td class="right">46.31</td><td class="right">28.62%</td><td class="left"> </td></tr><tr><td class="right">2017-06-29</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7248</td><td class="right">937.25</td><td class="right">0.68</td><td class="right">680</td><td class="right">45.70</td><td class="right">27.26%</td><td class="left"> </td></tr><tr><td class="right">2017-07-06</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7355</td><td class="right">923.62</td><td class="right">0.68</td><td class="right">680</td><td class="right">46.29</td><td class="right">28.92%</td><td class="left"> </td></tr><tr><td class="right">2017-07-11</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7089</td><td class="right">704.61</td><td class="right">0.50</td><td class="right">500</td><td class="right">45.40</td><td class="right">26.67%</td><td class="left"> </td></tr><tr><td class="right">2017-07-11</td><td class="right">001592</td><td class="left">天弘创业板指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7089</td><td class="right">281.85</td><td class="right">0.20</td><td class="right">200</td><td class="right">45.40</td><td class="right">26.67%</td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-1-3" class="outline-3"><h3 id="sec-1-3">中证500</h3><div class="outline-text-3" id="text-1-3"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-06-01</td><td class="right">000962</td><td class="left">天弘中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.9312</td><td class="right">171.65</td><td class="right">0.16</td><td class="right">160</td><td class="right">33.25</td><td class="right">39.15%</td><td class="left"> </td></tr><tr><td class="right">2017-06-08</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.4655</td><td class="right">122.67</td><td class="right">0.22</td><td class="right">180</td><td class="right">34.02</td><td class="right">40.46%</td><td class="left"> </td></tr><tr><td class="right">2017-06-15</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.4815</td><td class="right">121.35</td><td class="right">0.22</td><td class="right">180</td><td class="right">33.65</td><td class="right">40.10%</td><td class="left"> </td></tr><tr><td class="right">2017-06-22</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.4760</td><td class="right">121.80</td><td class="right">0.22</td><td class="right">180</td><td class="right">34.19</td><td class="right">41.05%</td><td class="left"> </td></tr><tr><td class="right">2017-06-29</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.5054</td><td class="right">119.42</td><td class="right">0.22</td><td class="right">180</td><td class="right">34.25</td><td class="right">41.32%</td><td class="left"> </td></tr><tr><td class="right">2017-07-06</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.5254</td><td class="right">117.86</td><td class="right">0.22</td><td class="right">180</td><td class="right">34.80</td><td class="right">42.81%</td><td class="left"> </td></tr><tr><td class="right">2017-07-11</td><td class="right">160119</td><td class="left">南方中证500指数</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.5090</td><td class="right">198.57</td><td class="right">0.36</td><td class="right">300</td><td class="right">34.84</td><td class="right">42.88%</td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-1-4" class="outline-3"><h3 id="sec-1-4">养老产业</h3><div class="outline-text-3" id="text-1-4"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-07-17</td><td class="right">000968</td><td class="left">广发中证养老产业指数A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.9987</td><td class="right">1800.18</td><td class="right">2.16</td><td class="right">1800</td><td class="right">33.97</td><td class="right">44.93%</td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-1-5" class="outline-3"><h3 id="sec-1-5">全指医药</h3><div class="outline-text-3" id="text-1-5"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-08-02</td><td class="right">001180</td><td class="left">广发中证医药卫生ETF联接A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.7825</td><td class="right">3191.05</td><td class="right">3.00</td><td class="right">2500</td><td class="right">41.80</td><td class="right">40.22%</td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-1-6" class="outline-3"><h3 id="sec-1-6">中证500</h3><div class="outline-text-3" id="text-1-6"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">前一天pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-10-27</td><td class="right">000478</td><td class="left">建信中证500指数增强</td><td class="left">场外</td><td class="left">买入</td><td class="right">2.5004</td><td class="right">1118.15</td><td class="right">4.19</td><td class="right">2800</td><td class="right">33.80</td><td class="right">39.09%</td><td class="left"> </td></tr><tr><td class="right">2017-10-27</td><td class="right">510500</td><td class="left">500ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">6.980</td><td class="right">300</td><td class="right">0.42</td><td class="right">2094.42</td><td class="right">33.80</td><td class="right">39.09%</td><td class="left"> </td></tr></tbody></table></div></div></div><div id="outline-container-sec-2" class="outline-2"><h2 id="sec-2">中证环保</h2><div class="outline-text-2" id="text-2"></div><div id="outline-container-sec-2-1" class="outline-3"><h3 id="sec-2-1">长线</h3><div class="outline-text-3" id="text-2-1"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入金额</td><td class="right">总金额</td><td class="right">总份数</td><td class="right">投入成本</td><td class="left">下期买入成本</td><td class="left">目前市值</td><td class="left">下期平衡日期</td><td class="left">下期期望市值</td><td class="right">pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-09-25</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.042</td><td class="right">2000</td><td class="right">0.42</td><td class="right">2084.42</td><td class="right">2084.42</td><td class="right">2000</td><td class="right">1.042</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">34.19</td><td class="right">16.30%</td><td class="left">1份</td></tr><tr><td class="right">2017-09-25</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.041</td><td class="right">2800</td><td class="right">0.58</td><td class="right">2915.38</td><td class="right">4999.80</td><td class="right">4800</td><td class="right">1.042</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">34.19</td><td class="right">16.30%</td><td class="left">2份</td></tr><tr><td class="right">2017-09-25</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.038</td><td class="right">4800</td><td class="right">1.00</td><td class="right">4983.40</td><td class="right">9983.20</td><td class="right">9600</td><td class="right">1.040</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">34.19</td><td class="right">16.30%</td><td class="left">3份</td></tr><tr><td class="right">2017-12-05</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">0.990</td><td class="right">2500</td><td class="right">0.50</td><td class="right">2475.50</td><td class="right">12458.70</td><td class="right">12100</td><td class="right">1.030</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">30.29</td><td class="right">0.40%</td><td class="left">4份</td></tr><tr><td class="right">2018-01-15</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">0.977</td><td class="right">6100</td><td class="right">1.19</td><td class="right">5960.89</td><td class="right">18419.59</td><td class="right">18200</td><td class="right">1.012</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">30.24</td><td class="right">0.47%</td><td class="left">6份</td></tr><tr><td class="right">2018-01-15</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">0.971</td><td class="right">6200</td><td class="right">1.20</td><td class="right">6021.40</td><td class="right">24440.99</td><td class="right">24400</td><td class="right">1.002</td><td class="left">0.802</td><td class="left">23692.40</td><td class="left">2018-02-14</td><td class="left">24166.25</td><td class="right">30.24</td><td class="right">0.47%</td><td class="left">8份</td></tr></tbody></table></div></div><div id="outline-container-sec-2-2" class="outline-3"><h3 id="sec-2-2">网格</h3><div class="outline-text-3" id="text-2-2"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">阶段</td><td class="right">价格</td><td class="left">类型</td></tr><tr><td class="right">初始</td><td class="right">1.120</td><td class="left"> </td></tr><tr><td class="right">0.95</td><td class="right">1.064</td><td class="left">小网</td></tr><tr><td class="right">0.90</td><td class="right">1.008</td><td class="left">小网</td></tr><tr><td class="right">0.85</td><td class="right">0.952</td><td class="left">小网，中网</td></tr><tr><td class="right">0.80</td><td class="right">0.896</td><td class="left">小网</td></tr><tr><td class="right">0.75</td><td class="right">0.840</td><td class="left">小网</td></tr><tr><td class="right">0.70</td><td class="right">0.784</td><td class="left">小网，中网，大网</td></tr></tbody></table><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="right">下次买入点</td><td class="right">下次卖出点</td><td class="left">备注</td></tr><tr><td class="right">2017-10-24</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.060</td><td class="right">1900</td><td class="right">0.40</td><td class="right">2014.40</td><td class="right">1.008</td><td class="right">1.120</td><td class="left">当成1.064买的</td></tr><tr><td class="right">2017-11-01</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.067</td><td class="right">3100</td><td class="right">0.66</td><td class="right">3308.36</td><td class="right">1.008</td><td class="right">1.120</td><td class="left">当成1.064买的</td></tr><tr><td class="right">2017-11-06</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">1.041</td><td class="right">4800</td><td class="right">1.00</td><td class="right">4997.80</td><td class="right">1.008</td><td class="right">1.120</td><td class="left">当成1.064买的</td></tr><tr><td class="right">2018-01-15</td><td class="right">512580</td><td class="left">环保ETF</td><td class="left">场内</td><td class="left">买入</td><td class="right">0.982</td><td class="right">6100</td><td class="right">1.20</td><td class="right">5991.40</td><td class="right">0.952</td><td class="right">1.064</td><td class="left">当成1.008买的</td></tr></tbody></table></div></div></div><div id="outline-container-sec-3" class="outline-2"><h2 id="sec-3">全指医药</h2><div class="outline-text-2" id="text-3"></div><div id="outline-container-sec-3-1" class="outline-3"><h3 id="sec-3-1">长线</h3><div class="outline-text-3" id="text-3-1"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="left"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入金额</td><td class="left">总金额</td><td class="left">总份数</td><td class="left">投入成本</td><td class="left">下期买入成本</td><td class="left">目前市值</td><td class="left">下期平衡日期</td><td class="left">下期期望市值</td><td class="right">pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2018-01-03</td><td class="right">001180</td><td class="left">广发中证全指医药卫生ETF联接A</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.8585</td><td class="right">3490.27</td><td class="right">3.60</td><td class="right">3000</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">39.35</td><td class="right">26.95%</td><td class="left"> </td></tr></tbody></table></div></div></div><div id="outline-container-sec-4" class="outline-2"><h2 id="sec-4">养老产业</h2><div class="outline-text-2" id="text-4"></div><div id="outline-container-sec-4-1" class="outline-3"><h3 id="sec-4-1">长线</h3><div class="outline-text-3" id="text-4-1"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入金额</td><td class="right">总金额</td><td class="right">总份数</td><td class="right">投入成本</td><td class="left">下期买入成本</td><td class="left">目前市值</td><td class="left">下期平衡日期</td><td class="left">下期期望市值</td><td class="right">pe</td><td class="right">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2018-01-03</td><td class="right">000968</td><td class="left">广发中证养老产业A</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.0938</td><td class="right">2739.44</td><td class="right">3.60</td><td class="right">3000</td><td class="right">3000</td><td class="right">2739.44</td><td class="right">1.095</td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="left"> </td><td class="right">31.29</td><td class="right">23.63%</td><td class="left">1份</td></tr></tbody></table></div></div></div><div id="outline-container-sec-5" class="outline-2"><h2 id="sec-5">商品</h2><div class="outline-text-2" id="text-5"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="left">前一天pe</td><td class="left">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-08-15</td><td class="right">162411</td><td class="left">华宝兴业油气</td><td class="left">场外</td><td class="left">买入</td><td class="right">0.5020</td><td class="right">1989.04</td><td class="right">1.50</td><td class="right">1000</td><td class="left"> </td><td class="left"> </td><td class="left"> </td></tr></tbody></table></div></div><div id="outline-container-sec-6" class="outline-2"><h2 id="sec-6">债券</h2><div class="outline-text-2" id="text-6"><table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides"><colgroup><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"><col class="right"><col class="right"><col class="right"><col class="right"><col class="left"><col class="left"><col class="left"></colgroup><tbody><tr><td class="right">时间</td><td class="right">标的编码</td><td class="left">标的名称</td><td class="left">类型</td><td class="left">买入或卖出</td><td class="right">单价</td><td class="right">数量</td><td class="right">手续费</td><td class="right">投入成本</td><td class="left">前一天pe</td><td class="left">pe百分位</td><td class="left">备注</td></tr><tr><td class="right">2017-09-15</td><td class="right">001061</td><td class="left">华夏海外收益债券A</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.2170</td><td class="right">3284.14</td><td class="right">3.20</td><td class="right">4000</td><td class="left"> </td><td class="left"> </td><td class="left"> </td></tr><tr><td class="right">2017-10-16</td><td class="right">050027</td><td class="left">博时信用债纯债债券</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.0720</td><td class="right">2330.22</td><td class="right">2.00</td><td class="right">2500</td><td class="left"> </td><td class="left"> </td><td class="left"> </td></tr><tr><td class="right">2017-10-16</td><td class="right">270048</td><td class="left">广发纯债债券A</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.1890</td><td class="right">2100.93</td><td class="right">2.00</td><td class="right">2500</td><td class="left"> </td><td class="left"> </td><td class="left"> </td></tr><tr><td class="right">2017-10-27</td><td class="right">270048</td><td class="left">广发纯债债券A</td><td class="left">场外</td><td class="left">买入</td><td class="right">1.1800</td><td class="right">2370.98</td><td class="right">2.24</td><td class="right">2800</td><td class="left"> </td><td class="left"> </td><td class="left"> </td></tr></tbody></table></div></div>]]></content>
<summary type="html">
<p>
今年6月份开始接触投资，发现一片新的广阔天地，不断学习中，将以后投资的情况记录到这里
</p>
</summary>
<category term="投资" scheme="http://irusist.github.io/categories/%E6%8A%95%E8%B5%84/"/>
<category term="投资" scheme="http://irusist.github.io/tags/%E6%8A%95%E8%B5%84/"/>
</entry>
<entry>
<title>quant_blog</title>
<link href="http://irusist.github.io/2017/11/05/quant-blog/"/>
<id>http://irusist.github.io/2017/11/05/quant-blog/</id>
<published>2017-11-04T16:00:00.000Z</published>
<updated>2017-12-23T10:18:54.000Z</updated>
<content type="html"><![CDATA[<ul class="org-ul"><li><a href="http://gaoya.blog.163.com/blog/static/602780662009112393655698/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662009112393655698/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066200911308183225/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066200911308183225/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201002001849158/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201002001849158/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010126503294/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010126503294/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010319375924/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010319375924/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/6027806620104121155906/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/6027806620104121155906/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201042051523782/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201042051523782/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201042610157809/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201042610157809/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010426112530980/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010426112530980/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010426113939806/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010426113939806/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010519365096/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010519365096/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010619383140/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010619383140/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010729324227/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010729324227/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201074113815688/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201074113815688/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/6027806620107179221158/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/6027806620107179221158/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010829347981/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010829347981/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201081312125992/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201081312125992/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201099102513505/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201099102513505/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/6027806620109286594389/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/6027806620109286594389/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201010193750848/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201010193750848/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010101815615626/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010101815615626/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/60278066201010244503431/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201010244503431/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/602780662010102893937970/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010102893937970/</a></li><li><a href="http://gaoya.blog.163.com/blog/static/6027806620101119541203/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/6027806620101119541203/</a></li><li></li></ul>]]></content>
<summary type="html">
<ul class="org-ul">
<li><a href="http://gaoya.blog.163.com/blog/static/602780662009112393655698/" target="_blank" rel="noopener">http://ga
</summary>
<category term="quant" scheme="http://irusist.github.io/categories/quant/"/>
<category term="quant" scheme="http://irusist.github.io/tags/quant/"/>
</entry>
<entry>
<title>hexo使用org-mode</title>
<link href="http://irusist.github.io/2017/11/05/hexo%E4%BD%BF%E7%94%A8org-mode/"/>
<id>http://irusist.github.io/2017/11/05/hexo使用org-mode/</id>
<published>2017-11-04T16:00:00.000Z</published>
<updated>2017-11-15T16:17:26.000Z</updated>
<content type="html"><![CDATA[<p>之前hexo用的一直都是markdown，从今天开始切换到org-mode，以下是安装的一些步骤</p><div id="outline-container-sec-1" class="outline-2"><h2 id="sec-1">安装</h2><div class="outline-text-2" id="text-1"><div class="org-src-container"><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">npm install -g hexo-cli --registry=https://registry.npm.taobao.org --proxy http://<span class="number">127.0</span>.<span class="number">0.1</span>:<span class="number">1080</span></span><br></pre></td></tr></table></figure></div><ul class="org-ul"><li>registry指定镜像</li><li>proxy指定代理</li></ul><a id="more"></a></div></div><div id="outline-container-sec-2" class="outline-2"><h2 id="sec-2">配置</h2><div class="outline-text-2" id="text-2"><div class="org-src-container"><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">hexo init blog-source</span><br><span class="line"><span class="built_in">cd</span> blog-source</span><br><span class="line">npm install --registry=https://registry.npm.taobao.org --proxy http://<span class="number">127.0</span>.<span class="number">0.1</span>:<span class="number">1080</span></span><br></pre></td></tr></table></figure></div></div></div><div id="outline-container-sec-3" class="outline-2"><h2 id="sec-3">主题</h2><div class="outline-text-2" id="text-3"><div class="org-src-container"><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">git <span class="built_in">clone</span> https://github.com/litten/hexo-theme-yilia.git themes/yilia</span><br></pre></td></tr></table></figure></div><p>修改hexo根目录下的 _config.yml ： theme: yilia</p></div></div><div id="outline-container-sec-4" class="outline-2"><h2 id="sec-4">org-mode</h2><div class="outline-text-2" id="text-4"><div class="org-src-container"><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">npm install https://github.com/CodeFalling/hexo-renderer-org<span class="comment">#emacs --save</span></span><br></pre></td></tr></table></figure></div><p>在 _config.yml 添加以下内容</p><div class="org-src-container"><figure class="highlight"><table><tr><td class="code"><pre><span class="line">org: emacs: 'D:\soft\emacs-25.1-x86_64-w64-mingw32\bin\emacs.exe' common: | 	#+OPTIONS: toc:nil num:nil</span><br></pre></td></tr></table></figure></div><p>在 _config.yml 的 new_post_name 修改为org文件名</p></div></div>]]></content>
<summary type="html">
<p>
之前hexo用的一直都是markdown，从今天开始切换到org-mode，以下是安装的一些步骤
</p>
<div id="outline-container-sec-1" class="outline-2">
<h2 id="sec-1">安装</h2>
<div class="outline-text-2" id="text-1">
<div class="org-src-container">
<figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">npm install -g hexo-cli --registry=https://registry.npm.taobao.org --proxy http://<span class="number">127.0</span>.<span class="number">0.1</span>:<span class="number">1080</span></span><br></pre></td></tr></table></figure>
</div>
<ul class="org-ul">
<li>registry指定镜像
</li>
<li>proxy指定代理
</li>
</ul>
</summary>
<category term="hexo" scheme="http://irusist.github.io/categories/hexo/"/>
<category term="hexo orgmode" scheme="http://irusist.github.io/tags/hexo-orgmode/"/>
</entry>
<entry>
<title>Play的Response处理</title>
<link href="http://irusist.github.io/2016/01/17/Play%E7%9A%84Response%E5%A4%84%E7%90%86/"/>
<id>http://irusist.github.io/2016/01/17/Play的Response处理/</id>
<published>2016-01-17T05:22:54.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>默认情况下，不需要指定<code>Content-Length</code>这个响应头，Play框架会根据响应内容自动计算出来，如<br><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">normal</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"Hello, Response"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p><p>会自动生成如下的响应头</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Content-Length:15</span><br><span class="line">Content-Type:text/plain; charset=utf-8</span><br><span class="line">Date:Sun, 17 Jan 2016 05:26:14 GMT</span><br></pre></td></tr></table></figure><a id="more"></a><p>可以使用<code>play.api.libs.iteratee.Enumerator</code>来生成响应内容，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">normal</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Result</span>(</span><br><span class="line"> header = <span class="type">ResponseHeader</span>(<span class="number">200</span>),</span><br><span class="line"> body = <span class="type">Enumerator</span>(<span class="string">"Hello, Enumerator"</span>.getBytes())</span><br><span class="line"> )</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这时也会生成<code>Content-Length</code>响应头，如下</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Content-Length:17</span><br><span class="line">Date:Sun, 17 Jan 2016 05:31:15 GMT</span><br></pre></td></tr></table></figure><p>在Play框架中，会把所有的相应内容都加载到内存，再计算出响应内容的长度。如果响应内容很多，就会占用很多内容，这时就需要自己来指定<code>Content-Length</code>来解决，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">normal</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="keyword">import</span> play.api.libs.concurrent.<span class="type">Execution</span>.<span class="type">Implicits</span>._</span><br><span class="line"> <span class="keyword">val</span> file = <span class="keyword">new</span> <span class="type">File</span>(<span class="string">"d:\\a.pdf"</span>)</span><br><span class="line"> <span class="type">Result</span>(</span><br><span class="line"> header = <span class="type">ResponseHeader</span>(<span class="number">200</span>, <span class="type">Map</span>(<span class="type">CONTENT_LENGTH</span> -> file.length().toString)),</span><br><span class="line"> body = <span class="type">Enumerator</span>.fromFile(file)</span><br><span class="line"> )</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>如果要处理文件，可以通过<code>Ok.sendFile</code>方法，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">header</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>.sendFile(content = <span class="keyword">new</span> <span class="type">File</span>(<span class="string">"d:\\a.pdf"</span>))</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这时会生成如下的响应头：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Content-Disposition:attachment; filename="a.pdf"</span><br><span class="line">Content-Length:54503</span><br><span class="line">Content-Type:application/pdf</span><br><span class="line">Date:Sun, 17 Jan 2016 05:40:49 GMT</span><br></pre></td></tr></table></figure><p>在浏览器访问时，会自动下载这个文件，文件名为<code>a.pdf</code></p><p>也可以指定其他的下载文件名，如:</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">header</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>.sendFile(content = <span class="keyword">new</span> <span class="type">File</span>(<span class="string">"d:\\a.pdf"</span>), fileName = _ => <span class="string">"custom.pdf"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这时生成的响应头如下：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Content-Disposition:attachment; filename="custom.pdf"</span><br><span class="line">Content-Length:54503</span><br><span class="line">Content-Type:application/pdf</span><br><span class="line">Date:Sun, 17 Jan 2016 05:42:32 GMT</span><br></pre></td></tr></table></figure><p>也可以通过指定<code>inline</code>参数，让浏览器直接打开这个文件，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">header</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>.sendFile(content = <span class="keyword">new</span> <span class="type">File</span>(<span class="string">"d:\\a.pdf"</span>), fileName = _ => <span class="string">"custom.pdf"</span>, inline = <span class="literal">true</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这时生成的响应头如下：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Content-Length:54503</span><br><span class="line">Content-Type:application/pdf</span><br><span class="line">Date:Sun, 17 Jan 2016 05:43:44 GMT</span><br></pre></td></tr></table></figure><p>浏览器会直接显示支持的文件格式的内容。</p><p>在Play中，支持<code>Chunked</code>传输形式，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">chunked</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="keyword">import</span> play.api.libs.concurrent.<span class="type">Execution</span>.<span class="type">Implicits</span>._</span><br><span class="line"> <span class="keyword">val</span> stream = <span class="keyword">new</span> <span class="type">FileInputStream</span>(<span class="string">"d:\\a.pdf"</span>)</span><br><span class="line"> <span class="type">Ok</span>.chunked(<span class="type">Enumerator</span>.fromStream(stream))</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以通过<code>Enumerator</code>的<code>apply</code>方法生成chunked的内容，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">chunked</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>.chunked(<span class="type">Enumerator</span>(<span class="string">"Hello"</span>, <span class="string">"World"</span>, <span class="string">"zhulx"</span>).andThen(<span class="type">Enumerator</span>.eof))</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>在Play中，可以通过chunked机制来实现comet，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">comet</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="keyword">val</span> events = <span class="type">Enumerator</span>(</span><br><span class="line"> <span class="string">""</span><span class="string">"<script>console.log('hello')</script>"</span><span class="string">""</span>,</span><br><span class="line"> <span class="string">""</span><span class="string">"<script>console.log('World')</script>"</span><span class="string">""</span></span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> <span class="type">Ok</span>.chunked(events).as(<span class="type">HTML</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这样，在浏览器的控制台就会打印日志。</p><p>可以通过<code>play.api.libs.iteratee.Enumeratee</code>来转换<code>Enumerator</code>对象，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> play.api.libs.concurrent.<span class="type">Execution</span>.<span class="type">Implicits</span>._</span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">toCometMessage</span> </span>= <span class="type">Enumeratee</span>.map[<span class="type">String</span>] {</span><br><span class="line"> data => <span class="type">Html</span>( <span class="string">""</span><span class="string">"<script>console.log('"</span><span class="string">""</span> + data + <span class="string">""</span><span class="string">"')</script>"</span><span class="string">""</span>)</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">comet</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="keyword">val</span> events = <span class="type">Enumerator</span>(<span class="string">"Hello"</span>, <span class="string">"world"</span>)</span><br><span class="line"> <span class="type">Ok</span>.chunked(events &> toCometMessage)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以使用<code>play.api.libs.Comet</code>帮助类</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">comet</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="keyword">val</span> events = <span class="type">Enumerator</span>(<span class="string">"Hello2"</span>, <span class="string">"World2"</span>)</span><br><span class="line"> <span class="type">Ok</span>.chunked(events &> <span class="type">Comet</span>(<span class="string">"console.log"</span>))</span><br><span class="line">}</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Play的Response处理
</summary>
<category term="Play" scheme="http://irusist.github.io/categories/Play/"/>
<category term="Play" scheme="http://irusist.github.io/tags/Play/"/>
<category term="Scala" scheme="http://irusist.github.io/tags/Scala/"/>
</entry>
<entry>
<title>ElasticSearch初体验:index的CRUD</title>
<link href="http://irusist.github.io/2016/01/13/ElasticSearch%E5%88%9D%E4%BD%93%E9%AA%8C-index%E7%9A%84CRUD/"/>
<id>http://irusist.github.io/2016/01/13/ElasticSearch初体验-index的CRUD/</id>
<published>2016-01-13T07:41:57.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>最近要使用ElasticSearch, 记录下学习的东西.</p><h2 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h2><p>首先要先安装, 要求JDK7以上, 直接获取安装包</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">// 下在安装包</span><br><span class="line">$ curl -L -O https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.7.4.tar.gz</span><br><span class="line">// 解压</span><br><span class="line">$ tar xvf elasticsearch-1.7.4.tar.gz</span><br><span class="line">$ <span class="built_in">cd</span> elasticsearch-1.7.4/bin</span><br><span class="line">// 启动, 集群名为 es-test</span><br><span class="line">$ ./elasticsearch --cluster.name es-test</span><br></pre></td></tr></table></figure><a id="more"></a><p>可以通过http请求的rest API来对集群进行操作, 主要可以做以下操作</p><ul><li>检查cluster, node, index的健康度, 状态, 统计信息</li><li>管理cluster, node, index的数据和元数据</li><li>CRUD操作</li><li>执行高级搜索操作,如分页,排序,过滤等等.</li></ul><h2 id="健康检查"><a href="#健康检查" class="headerlink" title="健康检查:"></a>健康检查:</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ curl <span class="string">'localhost:9200/_cat/health?v'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks</span><br><span class="line">1452669619 15:20:19 es-test green 1 1 0 0 0 0 0 0</span><br></pre></td></tr></table></figure><p>其中status表示集群的状态, 有3种状态, green表示一切正常, yellow表示数据是可用的, 但有的replica分片没有创建, red表示有部分数据不可用.</p><h2 id="查询node"><a href="#查询node" class="headerlink" title="查询node:"></a>查询node:</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ curl <span class="string">'localhost:9200/_cat/nodes?v'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">host ip heap.percent ram.percent load node.role master name</span><br><span class="line">localhost.localdomain 127.0.0.1 5 73 0.37 d * Whirlwind</span><br></pre></td></tr></table></figure><h2 id="查询index"><a href="#查询index" class="headerlink" title="查询index"></a>查询index</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">$ curl <span class="string">'localhost:9200/_cat/indices?v'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">health status index pri rep docs.count docs.deleted store.size pri.store.size</span><br></pre></td></tr></table></figure><h2 id="创建index"><a href="#创建index" class="headerlink" title="创建index"></a>创建index</h2><p>创建名为customer的index</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$ curl -XPUT <span class="string">'localhost:9200/customer?pretty'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">{</span><br><span class="line"> <span class="string">"acknowledged"</span> : <span class="literal">true</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>创建完之后再查询</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ curl <span class="string">'localhost:9200/_cat/indices?v'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">health status index pri rep docs.count docs.deleted store.size pri.store.size</span><br><span class="line">yellow open customer 5 1 0 0 575b 575b</span><br></pre></td></tr></table></figure><p>默认创建5个primary分片, 1个replica分片,0个documents.</p><h2 id="创建document"><a href="#创建document" class="headerlink" title="创建document"></a>创建document</h2><p>在customer的index上创建type为external, id为1的document</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">$ curl -XPUT <span class="string">'localhost:9200/customer/external/1?pretty'</span> -d <span class="string">'</span></span><br><span class="line"><span class="string">> {</span></span><br><span class="line"><span class="string">> "name": "John Doe"</span></span><br><span class="line"><span class="string">> }'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">{</span><br><span class="line"> <span class="string">"_index"</span> : <span class="string">"customer"</span>,</span><br><span class="line"> <span class="string">"_type"</span> : <span class="string">"external"</span>,</span><br><span class="line"> <span class="string">"_id"</span> : <span class="string">"1"</span>,</span><br><span class="line"> <span class="string">"_version"</span> : 1,</span><br><span class="line"> <span class="string">"created"</span> : <span class="literal">true</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="查询document"><a href="#查询document" class="headerlink" title="查询document"></a>查询document</h2><p>查询创建的document</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">$ curl -XGET <span class="string">'localhost:9200/customer/external/1?pretty'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">{</span><br><span class="line"> <span class="string">"_index"</span> : <span class="string">"customer"</span>,</span><br><span class="line"> <span class="string">"_type"</span> : <span class="string">"external"</span>,</span><br><span class="line"> <span class="string">"_id"</span> : <span class="string">"1"</span>,</span><br><span class="line"> <span class="string">"_version"</span> : 1,</span><br><span class="line"> <span class="string">"found"</span> : <span class="literal">true</span>,</span><br><span class="line"> <span class="string">"_source"</span>:</span><br><span class="line">{</span><br><span class="line"> <span class="string">"name"</span>: <span class="string">"John Doe"</span></span><br><span class="line">}</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="删除index"><a href="#删除index" class="headerlink" title="删除index"></a>删除index</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$ curl -XDELETE <span class="string">'localhost:9200/customer?pretty'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">{</span><br><span class="line"> <span class="string">"acknowledged"</span> : <span class="literal">true</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>删除之后再查询</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">$ curl <span class="string">'localhost:9200/_cat/indices?v'</span></span><br><span class="line"></span><br><span class="line">// 返回</span><br><span class="line">health status index pri rep docs.count docs.deleted store.size pri.store.size</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
ElasticSearch初体验:index的CRUD
</summary>
<category term="ElasticSearch" scheme="http://irusist.github.io/categories/ElasticSearch/"/>
<category term="ElasticSearch" scheme="http://irusist.github.io/tags/ElasticSearch/"/>
<category term="NoSQL" scheme="http://irusist.github.io/tags/NoSQL/"/>
</entry>
<entry>
<title>Golang之reflect</title>
<link href="http://irusist.github.io/2016/01/12/Golang%E4%B9%8Breflect/"/>
<id>http://irusist.github.io/2016/01/12/Golang之reflect/</id>
<published>2016-01-12T15:09:37.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Go语言中，使用<code>reflect</code>包可以对类型信息，类型的值进行获取和设置，分别用<code>Type</code>和<code>Value</code>表示。</p><p>可以定义一个类型，并且为类型声明一个方法</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">type</span> Person <span class="keyword">struct</span> {</span><br><span class="line"> Name <span class="keyword">string</span></span><br><span class="line"> Id <span class="keyword">int32</span></span><br><span class="line"> Age <span class="keyword">int32</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="params">(person Person)</span> <span class="title">Eat</span><span class="params">(food <span class="keyword">string</span>)</span></span> {</span><br><span class="line"> fmt.Println(<span class="string">"eat..."</span>, food)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><a id="more"></a><p><code>TypeOf</code>用于获取<code>Type</code>信息，如</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Type</span></span><br><span class="line">t := reflect.TypeOf(person)</span><br><span class="line"><span class="comment">// output: struct Person 3 1</span></span><br><span class="line">fmt.Println(t.Kind(), t.Name(), t.NumField(), t.NumMethod())</span><br></pre></td></tr></table></figure><p><code>Kind()</code>方法用于表示是哪种类型的，如<code>struct</code>, <code>int</code>, <code>string</code>等。<code>Name</code>方法表示类名，<code>NumField</code>表示字段的个数，<code>NumMethod</code>表示方法的个数。</p><p><code>ValueOf</code>用于获取<code>Value</code>信息，如</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Value</span></span><br><span class="line">v1 := reflect.ValueOf(person)</span><br><span class="line"><span class="comment">// output: struct {zhulx 1 28} 3 1 false</span></span><br><span class="line">fmt.Println(v1.Kind(), v1.Interface(), v1.NumField(), v1.NumMethod(), v1.CanSet())</span><br></pre></td></tr></table></figure><p><code>Interface</code>方法用于获取具体的值，<code>CanSet</code>表示是否可以修改原始类型的值，如果返回false，则不能调用<code>CanXXX()</code>类型的方法用来设置字段的值，也不能调用<code>Call</code>方法用来调用方法。</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 指针的Value</span></span><br><span class="line">v2 := reflect.ValueOf(&person)</span><br><span class="line"><span class="comment">// output: ptr &{zhulx 1 28} 3 1 false true</span></span><br><span class="line">fmt.Println(v2.Kind(), v2.Interface(), v2.Elem().NumField(), v2.NumMethod(), v2.CanSet(), v2.Elem().CanSet())</span><br></pre></td></tr></table></figure><p>可以通过传入指针类型对象来对原始对象的字段进行修改，或者调用方法，如</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Field Set</span></span><br><span class="line">v3 := reflect.ValueOf(&person).Elem()</span><br><span class="line">v3.FieldByName(<span class="string">"Age"</span>).SetInt(<span class="number">30</span>)</span><br><span class="line"><span class="comment">// output: 30</span></span><br><span class="line">fmt.Println(person.Age)</span><br></pre></td></tr></table></figure><p>也可以调用<code>Call</code>方法来调用具体某个方法，如</p><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Method Call</span></span><br><span class="line">v4 := reflect.ValueOf(&person).Elem()</span><br><span class="line"><span class="comment">// output: eat... apple</span></span><br><span class="line">v4.MethodByName(<span class="string">"Eat"</span>).Call([]reflect.Value{reflect.ValueOf(<span class="string">"apple"</span>)})</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Golang之reflect
</summary>
<category term="Go" scheme="http://irusist.github.io/categories/Go/"/>
<category term="Go" scheme="http://irusist.github.io/tags/Go/"/>
</entry>
<entry>
<title>Play框架学习之错误处理</title>
<link href="http://irusist.github.io/2016/01/10/Play%E6%A1%86%E6%9E%B6%E5%AD%A6%E4%B9%A0%E4%B9%8B%E9%94%99%E8%AF%AF%E5%A4%84%E7%90%86/"/>
<id>http://irusist.github.io/2016/01/10/Play框架学习之错误处理/</id>
<published>2016-01-10T06:07:50.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Play中，分为2种错误：客户端错误和服务端错误。客户端错误包括不规范的请求头数据，不支持的content type，找不到静态页面等等，服务端错误时会返回一个错误的页面。</p><h2 id="自定义错误处理"><a href="#自定义错误处理" class="headerlink" title="自定义错误处理"></a>自定义错误处理</h2><p>可以在app目录下创建一个名为<code>ErrorHandler</code>的类，实现<code>HttpErrorHandler</code>，注意，必须没有包名，并且类名必须为<code>ErrorHandler</code>，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ErrorHandler</span> <span class="keyword">extends</span> <span class="title">HttpErrorHandler</span> </span>{</span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">onClientError</span></span>(request: <span class="type">RequestHeader</span>, statusCode: <span class="type">Int</span>, message: <span class="type">String</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">Status</span>(statusCode)(<span class="string">"A client error occurred: "</span> + message)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">onServerError</span></span>(request: <span class="type">RequestHeader</span>, exception: <span class="type">Throwable</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">InternalServerError</span>(<span class="string">"A server error occurred: "</span> + exception.getMessage)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 在Action实现中直接抛出异常</span></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">custom</span></span>() = <span class="type">Action</span> { <span class="keyword">implicit</span> request =></span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="type">RuntimeException</span>(<span class="string">"RuntimeException"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>访问<a href="http://localhost:9000/custom" target="_blank" rel="noopener">http://localhost:9000/custom</a> 时，会返回“A server error occurred: RuntimeException”文本信息。</p><a id="more"></a><p>也可以在其他包中定义其他类名，并且在application.conf中指定，如</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">play.http.errorHandler = "error.CustomErrorHandler"</span><br></pre></td></tr></table></figure><h2 id="继承默认错误处理"><a href="#继承默认错误处理" class="headerlink" title="继承默认错误处理"></a>继承默认错误处理</h2><p>在Play的开发环境中，如果发生服务端错误，会定位出发生错误的代码块，并且提示出来，如果想要使用这种默认的处理机制，又想添加一些自定义的错误处理，则可以继承默认的处理类。</p><p>默认的处理类为<code>DefaultHttpErrorHandler</code>, 可以重写这个类的某些方法，处理一些自定义的方法，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> javax.inject.<span class="type">Inject</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.google.inject.<span class="type">Provider</span></span><br><span class="line"><span class="keyword">import</span> play.api._</span><br><span class="line"><span class="keyword">import</span> play.api.http.<span class="type">DefaultHttpErrorHandler</span></span><br><span class="line"><span class="keyword">import</span> play.api.mvc.{<span class="type">RequestHeader</span>, <span class="type">Results</span>}</span><br><span class="line"><span class="keyword">import</span> play.api.routing.<span class="type">Router</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> scala.concurrent.<span class="type">Future</span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ErrorHandler</span> <span class="title">@Inject</span>(<span class="params"></span>)(<span class="params"></span></span></span><br><span class="line"><span class="class"><span class="params"> environment: <span class="type">Environment</span>, configuration: <span class="type">Configuration</span>,</span></span></span><br><span class="line"><span class="class"><span class="params"> sourceMapper: <span class="type">OptionalSourceMapper</span>,</span></span></span><br><span class="line"><span class="class"><span class="params"> router: <span class="type">Provider</span>[<span class="type">Router</span>]</span></span></span><br><span class="line"><span class="class"><span class="params"> </span>) <span class="keyword">extends</span> <span class="title">DefaultHttpErrorHandler</span>(<span class="params">environment, configuration, sourceMapper, router</span>) </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="keyword">protected</span> <span class="function"><span class="keyword">def</span> <span class="title">onDevServerError</span></span>(request: <span class="type">RequestHeader</span>, exception: <span class="type">UsefulException</span>) = {</span><br><span class="line"> <span class="type">Logger</span>.info(<span class="string">"server error happens"</span>)</span><br><span class="line"> <span class="keyword">super</span>.onDevServerError(request, exception)</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="keyword">protected</span> <span class="function"><span class="keyword">def</span> <span class="title">onProdServerError</span></span>(request: <span class="type">RequestHeader</span>, exception: <span class="type">UsefulException</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">Results</span>.<span class="type">InternalServerError</span>(<span class="string">"A server error occurred: "</span> + exception.getMessage)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="keyword">protected</span> <span class="function"><span class="keyword">def</span> <span class="title">onForbidden</span></span>(request: <span class="type">RequestHeader</span>, message: <span class="type">String</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">Results</span>.<span class="type">Forbidden</span>(<span class="string">"your'are not allowed to access this resource."</span>)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Play框架学习之错误处理
</summary>
<category term="Play" scheme="http://irusist.github.io/categories/Play/"/>
<category term="Play2" scheme="http://irusist.github.io/tags/Play2/"/>
<category term="Play" scheme="http://irusist.github.io/tags/Play/"/>
<category term="Scala" scheme="http://irusist.github.io/tags/Scala/"/>
</entry>
<entry>
<title>Play框架学习之Content negotiation</title>
<link href="http://irusist.github.io/2016/01/10/Play%E6%A1%86%E6%9E%B6%E5%AD%A6%E4%B9%A0%E4%B9%8BContent-negotiation/"/>
<id>http://irusist.github.io/2016/01/10/Play框架学习之Content-negotiation/</id>
<published>2016-01-10T05:42:44.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>内容协商可以通过指定请求头以<code>Accept*</code>形式，对同一个请求地址，可以响应不同的内容。这在对一个服务支持xml或json格式的情况下很有用。</p><h2 id="Language"><a href="#Language" class="headerlink" title="Language"></a>Language</h2><p>在Play中可以通过<code>play.api.mvc.RequestHeader#acceptLanguages</code>方法获取支持的语言类型，它返回一个列表，通过解析请求的<code>Accept-Language</code>请求头，根据他们的quality value进行排序，如<code>zh-CN,zh;q=0.8</code>, 它的quality value为0.8。在Play中有一个隐式转换，转成<code>Lang</code>类型，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">implicit</span> <span class="function"><span class="keyword">def</span> <span class="title">request2lang</span></span>(<span class="keyword">implicit</span> request: <span class="type">RequestHeader</span>): <span class="type">Lang</span> = {</span><br><span class="line"> play.api.<span class="type">Play</span>.maybeApplication.map(app => play.api.i18n.<span class="type">Messages</span>.messagesApiCache(app).preferred(request).lang)</span><br><span class="line"> .getOrElse(request.acceptLanguages.headOption.getOrElse(play.api.i18n.<span class="type">Lang</span>.defaultLang))</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>它会找出排序过后列表中第一个支持的语言。</p><a id="more"></a><h2 id="Content"><a href="#Content" class="headerlink" title="Content"></a>Content</h2><p>类似地，<code>play.api.mvc.RequestHeader#acceptedTypes</code>方法会返回请求支持的MIME类型，它是通过解析请求头的<code>Accept</code>参数得到的，并根据quality因子进行排序。可以通过以下的方法来处理：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">custom</span></span>() = <span class="type">Action</span> { <span class="keyword">implicit</span> request =></span><br><span class="line"> render {</span><br><span class="line"> <span class="keyword">case</span> <span class="type">Accepts</span>.<span class="type">Html</span>() => <span class="type">Ok</span>(views.html.index(<span class="string">"html accepts"</span>))</span><br><span class="line"> <span class="keyword">case</span> <span class="type">Accepts</span>.<span class="type">Json</span>() => <span class="type">Ok</span>(<span class="type">Json</span>.toJson(<span class="string">"json accepts"</span>))</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>它解析<code>Accept</code>请求头，如果包含<code>text/html</code>，则返回index页面，如果包含<code>application/json</code>，则返回JSON格式的内容，如果请求头指定的是<code>application/xml</code>, 则会返回<code>val NOT_ACCEPTABLE = 406</code>。</p><h2 id="请求抽取器"><a href="#请求抽取器" class="headerlink" title="请求抽取器"></a>请求抽取器</h2><p>可以通过<code>play.api.mvc.Accepting</code>这个case class来自定义请求头抽取器，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">val</span> <span class="type">AcceptsMp3</span> = <span class="type">Accepting</span>(<span class="string">"audio/mp3"</span>)</span><br><span class="line"></span><br><span class="line">render {</span><br><span class="line"> <span class="keyword">case</span> <span class="type">AcceptsMp3</span>() => ???</span><br><span class="line">}</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Play框架学习之Content negotiation
</summary>
<category term="Play" scheme="http://irusist.github.io/categories/Play/"/>
<category term="Play2" scheme="http://irusist.github.io/tags/Play2/"/>
<category term="Play" scheme="http://irusist.github.io/tags/Play/"/>
<category term="Scala" scheme="http://irusist.github.io/tags/Scala/"/>
</entry>
<entry>
<title>Play框架学习之Action组合</title>
<link href="http://irusist.github.io/2016/01/09/Play%E6%A1%86%E6%9E%B6%E5%AD%A6%E4%B9%A0%E4%B9%8BAction%E7%BB%84%E5%90%88/"/>
<id>http://irusist.github.io/2016/01/09/Play框架学习之Action组合/</id>
<published>2016-01-09T15:21:03.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Play2中，可以组合多个<code>Action</code></p><h2 id="自定义Action"><a href="#自定义Action" class="headerlink" title="自定义Action"></a>自定义Action</h2><p>可以通过继承<code>ActionBuilder</code>来定义一个Action，Play2中自带的Action就是一个默认实现，如下是自定义一个<code>Action</code>，用于对每个请求打印信息。</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">object</span> <span class="title">LoggingAction</span> <span class="keyword">extends</span> <span class="title">ActionBuilder</span>[<span class="type">Request</span>] </span>{</span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">invokeBlock</span></span>[<span class="type">A</span>](request: <span class="type">Request</span>[<span class="type">A</span>], block: (<span class="type">Request</span>[<span class="type">A</span>]) => <span class="type">Future</span>[<span class="type">Result</span>]) = {</span><br><span class="line"> <span class="type">Logger</span>.info(<span class="string">"Calling action"</span>)</span><br><span class="line"> block(request)</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>可以通过如下的方法来使用这个自定义的<code>Action</code>:</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">custom</span></span>() = <span class="type">LoggingAction</span> {</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"custom action"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>这样，在每次请求时就会打印“Calling action”信息。</p><a id="more"></a><h3 id="组合Action"><a href="#组合Action" class="headerlink" title="组合Action"></a>组合Action</h3><p>在开发时，经常遇到会对每一个<code>Action</code>进行一些通用的处理，如日志， 权限等，在Play2中，可以将它们定义成不同的<code>Action</code>，然后将它们组合起来。</p><p>可以通过继承<code>Action</code>来创建新的<code>Action</code>，它是一个接收其他<code>Action</code>的<code>case class</code>。</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">case</span> <span class="class"><span class="keyword">class</span> <span class="title">Logging</span>[<span class="type">A</span>](<span class="params">action: <span class="type">Action</span>[<span class="type">A</span>]</span>) <span class="keyword">extends</span> <span class="title">Action</span>[<span class="type">A</span>] </span>{</span><br><span class="line"> <span class="keyword">lazy</span> <span class="keyword">val</span> parser: <span class="type">BodyParser</span>[<span class="type">A</span>] = action.parser</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">apply</span></span>(request: <span class="type">Request</span>[<span class="type">A</span>]): <span class="type">Future</span>[<span class="type">Result</span>] = {</span><br><span class="line"> <span class="type">Logger</span>.info(<span class="string">"Calling action"</span>)</span><br><span class="line"> action(request)</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以通过<code>Action.async</code>方法来定义一个接收其他<code>Action</code>的参数，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">logging</span></span>[<span class="type">A</span>](action: <span class="type">Action</span>[<span class="type">A</span>]) = <span class="type">Action</span>.async(action.parser) { request =></span><br><span class="line"> <span class="type">Logger</span>.info(<span class="string">"Calling action"</span>)</span><br><span class="line"> action(request)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以通过<code>ActionBuilder</code>的<code>composeAction</code>方法来将它本身的<code>Action</code>组装到其他<code>Action</code>中，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">object</span> <span class="title">LoggingAction</span> <span class="keyword">extends</span> <span class="title">ActionBuilder</span>[<span class="type">Request</span>] </span>{</span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">invokeBlock</span></span>[<span class="type">A</span>](request: <span class="type">Request</span>[<span class="type">A</span>], block: (<span class="type">Request</span>[<span class="type">A</span>]) => <span class="type">Future</span>[<span class="type">Result</span>]) = {</span><br><span class="line"> block(request)</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="keyword">protected</span> <span class="function"><span class="keyword">def</span> <span class="title">composeAction</span></span>[<span class="type">A</span>](action: <span class="type">Action</span>[<span class="type">A</span>]): <span class="type">Action</span>[<span class="type">A</span>] = <span class="type">Logging</span>[<span class="type">A</span>](action)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>可以通过以下方法来使用<code>logging</code>方法：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">custom</span></span>() = logging {</span><br><span class="line"> <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"custom action"</span>)</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="更复杂的Action"><a href="#更复杂的Action" class="headerlink" title="更复杂的Action"></a>更复杂的Action</h3><p>可以通过组合<code>Action</code>来修改request对象，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">xForwardedFor</span></span>[<span class="type">A</span>](action: <span class="type">Action</span>[<span class="type">A</span>]) = <span class="type">Action</span>.async(action.parser) { request =></span><br><span class="line"> <span class="keyword">val</span> newRequest = request.headers.get(<span class="type">X_FORWARDED_FOR</span>).map { xff =></span><br><span class="line"> <span class="keyword">new</span> <span class="type">WrappedRequest</span>[<span class="type">A</span>](request) {</span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">remoteAddress</span> </span>= xff</span><br><span class="line"> }</span><br><span class="line"> } getOrElse request</span><br><span class="line"> action(newRequest)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以修改返回的结果，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">addUaHeader</span></span>[<span class="type">A</span>](action: <span class="type">Action</span>[<span class="type">A</span>]) = <span class="type">Action</span>.async(action.parser) { request =></span><br><span class="line"> action(request).map(_.withHeaders(<span class="string">"X-UA-Compatible"</span> -> <span class="string">"Chrome=1"</span>))</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="不同的请求类型"><a href="#不同的请求类型" class="headerlink" title="不同的请求类型"></a>不同的请求类型</h2><p><code>ActionFunction</code>是一个作用于request的方法，它可以用于权限，认证，查询数据库对象等。有以下内置的<code>ActionFunction</code>：</p><ul><li><p><code>ActionTransformer</code>：可以用来修改request，如增加一些额外的信息。</p></li><li><p><code>ActionFilter</code>：可以用来拦截某些不符合条件的请求，不用来改变请求的值。</p></li><li><p><code>ActionRefiner</code>：是上面2个的父类</p></li><li><p><code>ActionBuilder</code>：以<code>Request</code>作为输入参数，生成Action，是上面3个的父类，最通用的类。</p></li></ul><h3 id="认证"><a href="#认证" class="headerlink" title="认证"></a>认证</h3><p>以下是一个认证的例子，通过组合以上的<code>ActionFunction</code>。</p><p>首先，自定义一个请求类，并且定义Action</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">UserRequest</span>[<span class="type">A</span>](<span class="params">val username: <span class="type">Option</span>[<span class="type">String</span>], request: <span class="type">Request</span>[<span class="type">A</span>]</span>) <span class="keyword">extends</span> <span class="title">WrappedRequest</span>[<span class="type">A</span>](<span class="params">request</span>)</span></span><br><span class="line"><span class="class"></span></span><br><span class="line"><span class="class"><span class="title">object</span> <span class="title">UserAction</span> <span class="keyword">extends</span></span></span><br><span class="line"><span class="class"> <span class="title">ActionBuilder</span>[<span class="type">UserRequest</span>] <span class="keyword">with</span> <span class="title">ActionTransformer</span>[<span class="type">Request</span>, <span class="type">UserRequest</span>] </span>{</span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">transform</span></span>[<span class="type">A</span>](request: <span class="type">Request</span>[<span class="type">A</span>]) = <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="keyword">new</span> <span class="type">UserRequest</span>(request.session.get(<span class="string">"username"</span>), request)</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>添加一些额外的信息，生成另一个请求对象</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ItemRequest</span>[<span class="type">A</span>](<span class="params">val item: <span class="type">Item</span>, request: <span class="type">UserRequest</span>[<span class="type">A</span>]</span>) <span class="keyword">extends</span> <span class="title">WrappedRequest</span>[<span class="type">A</span>](<span class="params">request</span>) </span>{</span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">username</span> </span>= request.username</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>然后对请求信息进行转换</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">ItemAction</span></span>(itemId: <span class="type">String</span>) = <span class="keyword">new</span> <span class="type">ActionRefiner</span>[<span class="type">UserRequest</span>, <span class="type">ItemRequest</span>] {</span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">refine</span></span>[<span class="type">A</span>](input: <span class="type">UserRequest</span>[<span class="type">A</span>]) = <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">ItemDao</span>.findById(itemId)</span><br><span class="line"> .map(<span class="keyword">new</span> <span class="type">ItemRequest</span>(_, input))</span><br><span class="line"> .toRight(<span class="type">NotFound</span>)</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>验证请求内容</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">object</span> <span class="title">PermissionCheckAction</span> <span class="keyword">extends</span> <span class="title">ActionFilter</span>[<span class="type">ItemRequest</span>] </span>{</span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">filter</span></span>[<span class="type">A</span>](input: <span class="type">ItemRequest</span>[<span class="type">A</span>]) = <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="keyword">if</span> (!input.item.accessibleByUser(input.username))</span><br><span class="line"> <span class="type">Some</span>(<span class="type">Forbidden</span>)</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> <span class="type">None</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>最后将所有的转换组合在一起：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">tagItem</span></span>(itemId: <span class="type">String</span>, tag: <span class="type">String</span>) =</span><br><span class="line"> (<span class="type">UserAction</span> andThen <span class="type">ItemAction</span>(itemId) andThen <span class="type">PermissionCheckAction</span>) { request =></span><br><span class="line"> request.item.addTag(tag)</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"User "</span> + request.username + <span class="string">" tagged "</span> + request.item.id)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Play框架学习之Action组合
</summary>
<category term="Play" scheme="http://irusist.github.io/categories/Play/"/>
<category term="Play2" scheme="http://irusist.github.io/tags/Play2/"/>
<category term="Play" scheme="http://irusist.github.io/tags/Play/"/>
<category term="Scala" scheme="http://irusist.github.io/tags/Scala/"/>
</entry>
<entry>
<title>Play框架学习之Action, Controller, Result</title>
<link href="http://irusist.github.io/2016/01/08/Play%E6%A1%86%E6%9E%B6%E5%AD%A6%E4%B9%A0%E4%B9%8BAction-Controller-Result/"/>
<id>http://irusist.github.io/2016/01/08/Play框架学习之Action-Controller-Result/</id>
<published>2016-01-08T14:34:46.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>折腾了2个晚上，终于把Play2框架编译成功搭建起来，跟着官网的文档体验一下。</p><h2 id="Action"><a href="#Action" class="headerlink" title="Action"></a>Action</h2><p>Action是用于请求的地方，最简单的Action就是返回一些文本或页面的Result，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"Hello world"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>其中OK是一个<code>Status</code>对象，它接收一个值为200的<code>Int</code>类型代表响应头的状态码，同时<code>Status</code>类有一个<code>apply</code>方法，它有一个参数，代表响应的内容。</p><p>Action也接收一个<code>Request => Result</code>类型的参数， 可以对请求信息进行处理，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span> </span>= <span class="type">Action</span> { request =></span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"request is: "</span> + request)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><a id="more"></a><p>request参数可以定义成隐式参数的形式</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span> </span>= <span class="type">Action</span> { <span class="keyword">implicit</span> request =></span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"request is: "</span> + request)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>Action还可以有一个<code>BodyParser</code>参数，用于解析请求body的内容，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span> </span>= <span class="type">Action</span>(parse.json) { <span class="keyword">implicit</span> request =></span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"request is: "</span> + request)</span><br></pre></td></tr></table></figure><p>表示请求的body可以通过json来解析，因此body的格式必须为<code>text/json</code>或者<code>application/json</code>的。</p><h2 id="Controller"><a href="#Controller" class="headerlink" title="Controller"></a>Controller</h2><p>Controller是一个用来定义<code>Action</code>的一个单例对象。最简单的<code>Controller</code>的方法是没有参数的</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span> </span>= <span class="type">Action</span> { request =></span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"request is: "</span> + request)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>方法也可以有参数，这些参数可以被<code>Action</code>中的代码块使用，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span></span>(name : <span class="type">String</span>) = <span class="type">Action</span> { request =></span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"parameter is: "</span> + name)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="Result"><a href="#Result" class="headerlink" title="Result"></a>Result</h2><p><code>Result</code>是<code>Action</code>的返回类型，它可以设置响应头和响应体，如：</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">add</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Result</span>(</span><br><span class="line"> header = <span class="type">ResponseHeader</span>(<span class="number">200</span>, <span class="type">Map</span>(<span class="type">CONTENT_TYPE</span> -> <span class="string">"text/plain"</span>)),</span><br><span class="line"> body = <span class="type">Enumerator</span>(<span class="string">"response"</span>.getBytes)</span><br><span class="line"> )</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>也可以设置各种响应码，如404，500等，一些常用的如下</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** Generates a ‘403 FORBIDDEN’ result. */</span></span><br><span class="line"><span class="keyword">val</span> <span class="type">Forbidden</span> = <span class="keyword">new</span> <span class="type">Status</span>(<span class="type">FORBIDDEN</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">/** Generates a ‘404 NOT_FOUND’ result. */</span></span><br><span class="line"><span class="keyword">val</span> <span class="type">NotFound</span> = <span class="keyword">new</span> <span class="type">Status</span>(<span class="type">NOT_FOUND</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">/** Generates a ‘500 INTERNAL_SERVER_ERROR’ result. */</span></span><br><span class="line"><span class="keyword">val</span> <span class="type">InternalServerError</span> = <span class="keyword">new</span> <span class="type">Status</span>(<span class="type">INTERNAL_SERVER_ERROR</span>)</span><br></pre></td></tr></table></figure><p><code>Result</code>也可以返回一个重定向的结果，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">redirect</span> </span>= <span class="type">Action</span> { request =></span><br><span class="line"> <span class="type">Redirect</span>(<span class="string">"/add"</span>, <span class="type">MOVED_PERMANENTLY</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>重定向时如果不指定第2个参数，则默认响应头为<code>val SEE_OTHER = 303</code></p><p><code>Action</code>也支持一个默认的<code>TODO</code>页面，如</p><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">index</span></span>(name:<span class="type">String</span>) = <span class="type">TODO</span></span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Play框架学习之Action, Controller, Result
</summary>
<category term="Play" scheme="http://irusist.github.io/categories/Play/"/>
<category term="Play2" scheme="http://irusist.github.io/tags/Play2/"/>
<category term="Play" scheme="http://irusist.github.io/tags/Play/"/>
<category term="Scala" scheme="http://irusist.github.io/tags/Scala/"/>
</entry>
<entry>
<title>Java 8之Arrays新增方法</title>
<link href="http://irusist.github.io/2016/01/07/Java-8%E4%B9%8BArrays%E6%96%B0%E5%A2%9E%E6%96%B9%E6%B3%95/"/>
<id>http://irusist.github.io/2016/01/07/Java-8之Arrays新增方法/</id>
<published>2016-01-07T14:43:46.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Java 8中，在Arrays工具类中增加了一些对数组相关的并行和流的操作。</p><h2 id="parallelSort-方法"><a href="#parallelSort-方法" class="headerlink" title="parallelSort 方法"></a>parallelSort 方法</h2><p><code>parallelSort</code>方法是并行地对数组进行排序，它有很多个重载方法，可以对基本类型， <code>Comparable</code>类型对象，或者提供一个<code>Comparator</code>接口对一般对象进行排序。</p><p>如果数组的大小小于或等于8192(1 << 13)，会直接排序，不会并行。并行排序使用的是ForkJoin框架。</p><a id="more"></a><h2 id="parallelPrefix-方法"><a href="#parallelPrefix-方法" class="headerlink" title="parallelPrefix 方法"></a>parallelPrefix 方法</h2><p><code>parallelPrefix</code>方法需要提供一个操作方法，通过遍历数组的元素，将当前索引位置的值与它之前索引的值进行操作，然后将操作后的值覆盖当前索引位置的值。下面用一个简单说明一下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span>[] array = <span class="keyword">new</span> <span class="keyword">int</span>[]{<span class="number">2</span>, <span class="number">3</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">5</span>};</span><br><span class="line"><span class="comment">// [2, 3, 1, 0, 5]</span></span><br><span class="line"><span class="comment">// [2, 5, 1, 0, 5]</span></span><br><span class="line"><span class="comment">// [2, 5, 6, 0, 5]</span></span><br><span class="line"><span class="comment">// [2, 5, 6, 6, 5]</span></span><br><span class="line">Arrays.parallelPrefix(array, (left, right) ->{</span><br><span class="line"> System.out.println(Arrays.toString(array));</span><br><span class="line"> <span class="keyword">return</span> left + right;</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line"><span class="comment">// 输出 [2, 5, 6, 6, 11]</span></span><br><span class="line">System.out.println(Arrays.toString(array));</span><br></pre></td></tr></table></figure><p>上面将每一步操作都输出结果，首先，从索引为1开始循环，将索引为0的值2, 与索引为1的值3进行相加，得到5覆盖索引为1的值，依此直到达到数组的最后一个元素。</p><h2 id="setAll-方法"><a href="#setAll-方法" class="headerlink" title="setAll 方法"></a>setAll 方法</h2><p><code>setAll</code>方法提供一个 <code>int -> T</code>的函数接口，通过该接口对数组的索引进行操作，然后将指定数组当前索引位置的值赋值为操作后的值，以下是例子</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span>[] array = <span class="keyword">new</span> <span class="keyword">int</span>[<span class="number">10</span>];</span><br><span class="line">Arrays.setAll(array, i -> i * <span class="number">10</span>);</span><br><span class="line"><span class="comment">// 输出 [0, 10, 20, 30, 40, 50, 60, 70, 80, 90]</span></span><br><span class="line">System.out.println(Arrays.toString(array));</span><br></pre></td></tr></table></figure><p><code>parallelSetAll</code>方法是 <code>setAll</code>的并行操作版本。</p><h2 id="spliterator-方法"><a href="#spliterator-方法" class="headerlink" title="spliterator 方法"></a>spliterator 方法</h2><p><code>spliterator</code>方法返回一个<code>Spliterator</code>, 关于<code>Spliterator</code>的内容，后续再详细说明下。</p><h2 id="stream-方法"><a href="#stream-方法" class="headerlink" title="stream 方法"></a>stream 方法</h2><p><code>stream</code> 方法是将数组转换为<code>Stream</code>的操作，可以是任意类型的数组， 并且可以指定数组的范围。</p>]]></content>
<summary type="html">
Java 8之Arrays新增方法
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
</entry>
<entry>
<title>Java 8之并行Stream</title>
<link href="http://irusist.github.io/2016/01/05/Java-8%E4%B9%8B%E5%B9%B6%E8%A1%8CStream/"/>
<id>http://irusist.github.io/2016/01/05/Java-8之并行Stream/</id>
<published>2016-01-05T15:09:53.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>Java 8中的Stream的操作可以通过并行的操作执行，通过<code>Stream.parallel</code>或者<code>Collection.parallelStream</code>方法可以获取并行操作的流。</p><p>并行流需要满足以下2个要求：</p><ul><li><p>恒等性：初始值必须为组合函数的恒等值，拿恒等值和其他值做reduce操作时，其他值保持不变。</p></li><li><p>组合律：改变组合操作的顺序不会影响最终的结果。</p></li></ul><a id="more"></a><p>在书中有个蒙特卡洛模拟法的例子，为了学习，参考书中，写个一样的例子如下</p><p>Java 8之前的版本</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MonteCarloMethod</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> ConcurrentMap<Integer, Double> map = <span class="keyword">new</span> ConcurrentHashMap<>();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> threadCount = Runtime.getRuntime().availableProcessors();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> ExecutorService pool = Executors.newFixedThreadPool(threadCount);</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="comment">// 执行次数</span></span><br><span class="line"> <span class="keyword">long</span> count = <span class="number">100000000L</span>;</span><br><span class="line"></span><br><span class="line"> MonteCarloMethod bean = <span class="keyword">new</span> MonteCarloMethod();</span><br><span class="line"> bean.loop(count);</span><br><span class="line"> bean.print();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">loop</span><span class="params">(<span class="keyword">long</span> count)</span> </span>{</span><br><span class="line"> <span class="comment">// 每个线程执行的个数</span></span><br><span class="line"> <span class="keyword">long</span> taskPerThread = count / threadCount;</span><br><span class="line"></span><br><span class="line"> List<Future> futures = <span class="keyword">new</span> ArrayList<>(threadCount);</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < threadCount; i++) {</span><br><span class="line"> futures.add(pool.submit(getTask(count, taskPerThread)));</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 等待执行完成</span></span><br><span class="line"> futures.forEach(future -> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> future.get();</span><br><span class="line"> } <span class="keyword">catch</span> (ExecutionException | InterruptedException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"></span><br><span class="line"> pool.shutdown();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 获取每个线程的执行任务</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> count</span></span><br><span class="line"><span class="comment"> * 总的任务数</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> taskPerThread</span></span><br><span class="line"><span class="comment"> * 每个线程的任务数</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> 执行任务</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> Runnable <span class="title">getTask</span><span class="params">(<span class="keyword">long</span> count, <span class="keyword">long</span> taskPerThread)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> () -> {</span><br><span class="line"> <span class="keyword">double</span> data = <span class="number">1.0</span> / count;</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < taskPerThread; i++) {</span><br><span class="line"> map.compute(doTask(), (key, value) -> {</span><br><span class="line"> <span class="keyword">if</span> (value == <span class="keyword">null</span>)</span><br><span class="line"> <span class="keyword">return</span> data;</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> <span class="keyword">return</span> value + data;</span><br><span class="line"> });</span><br><span class="line"> }</span><br><span class="line"> };</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 获取2个随机1到6的数字之和</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> 随机数之和</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">int</span> <span class="title">doTask</span><span class="params">()</span> </span>{</span><br><span class="line"> ThreadLocalRandom random = ThreadLocalRandom.current();</span><br><span class="line"> <span class="keyword">int</span> first = random.nextInt(<span class="number">1</span>, <span class="number">7</span>);</span><br><span class="line"> <span class="keyword">int</span> second = random.nextInt(<span class="number">1</span>, <span class="number">7</span>);</span><br><span class="line"> <span class="keyword">return</span> first + second;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 打印map内容</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">print</span><span class="params">()</span> </span>{</span><br><span class="line"> map.entrySet().forEach(System.out::println);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>Java 8版本如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MonteCarloMethodStream</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">new</span> MonteCarloMethodStream().loop(<span class="number">100000000L</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">loop</span><span class="params">(<span class="keyword">long</span> count)</span> </span>{</span><br><span class="line"> <span class="keyword">double</span> data = <span class="number">1.0</span> / count;</span><br><span class="line"> LongStream.range(<span class="number">0</span>, count).parallel()</span><br><span class="line"> .mapToObj(origin -> random())</span><br><span class="line"> .collect(Collectors.groupingBy(origin -> origin, Collectors.summingDouble(origin -> data)))</span><br><span class="line"> .entrySet().forEach(System.out::println);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 获取2个随机1到6的数字之和</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> 随机数之和</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">int</span> <span class="title">random</span><span class="params">()</span> </span>{</span><br><span class="line"> ThreadLocalRandom random = ThreadLocalRandom.current();</span><br><span class="line"> <span class="keyword">int</span> first = random.nextInt(<span class="number">1</span>, <span class="number">7</span>);</span><br><span class="line"> <span class="keyword">int</span> second = random.nextInt(<span class="number">1</span>, <span class="number">7</span>);</span><br><span class="line"> <span class="keyword">return</span> first + second;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>在Java 8中，并行流替我们做了一些并发处理的逻辑，代码显得简洁很多。</p>]]></content>
<summary type="html">
Java 8之并行Stream
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
</entry>
<entry>
<title>Java 8之Map新增方法</title>
<link href="http://irusist.github.io/2016/01/04/Java-8%E4%B9%8BMap%E6%96%B0%E5%A2%9E%E6%96%B9%E6%B3%95/"/>
<id>http://irusist.github.io/2016/01/04/Java-8之Map新增方法/</id>
<published>2016-01-04T14:52:04.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Java 8中的<code>Map.Entry</code>接口中增加了<code>comparingByKey</code>, <code>comparingByValue</code>方法，它们都返回<code>Comparator<Map.Entry<K,V>></code>, <code>Comparator</code>是一个函数接口，主要是方便Lambda表达式的使用。</p><p>在Java 8中的<code>Map</code>接口增加了一些default方法，提升了对key， value操作的便利性。下面是基本数据的定义，通过这些数据说明新增的一些方法。</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Map<Integer, String> map = <span class="keyword">new</span> HashMap<>();</span><br><span class="line">map.put(<span class="number">1</span>, <span class="string">"a"</span>);</span><br><span class="line">map.put(<span class="number">2</span>, <span class="string">"b"</span>);</span><br><span class="line">map.put(<span class="number">3</span>, <span class="string">"c"</span>);</span><br></pre></td></tr></table></figure><a id="more"></a><h2 id="getOrDefault-方法"><a href="#getOrDefault-方法" class="headerlink" title="getOrDefault 方法"></a>getOrDefault 方法</h2><p>如果指定的key存在，则返回该key对应的value，如果不存在，则返回指定的值。例子如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// key为4不存在，输出 d</span></span><br><span class="line">System.out.println(map.getOrDefault(<span class="number">4</span>, <span class="string">"d"</span>));</span><br></pre></td></tr></table></figure><h2 id="forEach-方法"><a href="#forEach-方法" class="headerlink" title="forEach 方法"></a>forEach 方法</h2><p>遍历<code>Map</code>中的所有Entry, 对key, value进行处理， 接收参数 <code>(K, V) -> void</code>, 例子如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出1a, 2b, 3c</span></span><br><span class="line">map.forEach((key, value) -> System.out.println(key + value));</span><br></pre></td></tr></table></figure><h2 id="replaceAll-方法"><a href="#replaceAll-方法" class="headerlink" title="replaceAll 方法"></a>replaceAll 方法</h2><p>替换<code>Map</code>中所有Entry的value值，这个值由旧的key和value计算得出，接收参数 <code>(K, V) -> V</code>, 类似如下代码</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (Map.Entry<K, V> entry : map.entrySet())</span><br><span class="line"> entry.setValue(function.apply(entry.getKey(), entry.getValue()));</span><br></pre></td></tr></table></figure><p>例如如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">map.replaceAll((key, value) -> (key + <span class="number">1</span>) + value);</span><br><span class="line"><span class="comment">// 输出 12a 23b 34c</span></span><br><span class="line">map.forEach((key, value) -> System.out.println(key + value));</span><br></pre></td></tr></table></figure><h2 id="putIfAbsent-方法"><a href="#putIfAbsent-方法" class="headerlink" title="putIfAbsent 方法"></a>putIfAbsent 方法</h2><p>如果key关联的value不存在，则关联新的value值，返回key关联的旧的值，类似如下代码</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">V v = map.get(key);</span><br><span class="line"><span class="keyword">if</span> (v == <span class="keyword">null</span>)</span><br><span class="line"> v = map.put(key, value);</span><br><span class="line"></span><br><span class="line"><span class="keyword">return</span> v;</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">map.putIfAbsent(<span class="number">3</span>, <span class="string">"d"</span>);</span><br><span class="line">map.putIfAbsent(<span class="number">4</span>, <span class="string">"d"</span>);</span><br><span class="line"><span class="comment">// 输出 c</span></span><br><span class="line">System.out.println(map.get(<span class="number">3</span>));</span><br><span class="line"><span class="comment">// 输出 d</span></span><br><span class="line">System.out.println(map.get(<span class="number">4</span>));</span><br></pre></td></tr></table></figure><h2 id="remove-方法"><a href="#remove-方法" class="headerlink" title="remove 方法"></a>remove 方法</h2><p>接收2个参数，key和value，如果key关联的value值与指定的value值相等（<code>equals</code>)，则删除这个元素，类似代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (map.containsKey(key) && Objects.equals(map.get(key), value)) {</span><br><span class="line"> map.remove(key);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">} <span class="keyword">else</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">map.remove(<span class="number">1</span>, <span class="string">"b"</span>);</span><br><span class="line"><span class="comment">// 未删除成功， 输出 a</span></span><br><span class="line">System.out.println(map.get(<span class="number">1</span>));</span><br><span class="line"></span><br><span class="line">map.remove(<span class="number">2</span>, <span class="string">"b"</span>);</span><br><span class="line"><span class="comment">// 删除成功，输出 null</span></span><br><span class="line">System.out.println(map.get(<span class="number">2</span>));</span><br></pre></td></tr></table></figure><h2 id="replace-K-key-V-oldValue-V-newValue-方法"><a href="#replace-K-key-V-oldValue-V-newValue-方法" class="headerlink" title="replace(K key, V oldValue, V newValue) 方法"></a>replace(K key, V oldValue, V newValue) 方法</h2><p>如果key关联的值与指定的oldValue的值相等，则替换成新的newValue，类似代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (map.containsKey(key) && Objects.equals(map.get(key), value)) {</span><br><span class="line"> map.put(key, newValue);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">} <span class="keyword">else</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br></pre></td></tr></table></figure><p>示例代码如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">map.replace(<span class="number">3</span>, <span class="string">"a"</span>, <span class="string">"z"</span>);</span><br><span class="line"><span class="comment">// 未替换成功，输出 c</span></span><br><span class="line">System.out.println(map.get(<span class="number">3</span>));</span><br><span class="line"></span><br><span class="line">map.replace(<span class="number">1</span>, <span class="string">"a"</span>, <span class="string">"z"</span>);</span><br><span class="line"><span class="comment">// 替换成功， 输出 z</span></span><br><span class="line">System.out.println(map.get(<span class="number">1</span>));</span><br></pre></td></tr></table></figure><h2 id="replace-K-key-V-value-方法"><a href="#replace-K-key-V-value-方法" class="headerlink" title="replace(K key, V value) 方法"></a>replace(K key, V value) 方法</h2><p>如果map中存在key，则替换成value值，否则返回<code>null</code>, 类似代码如下:</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (map.containsKey(key)) {</span><br><span class="line"> <span class="keyword">return</span> map.put(key, value);</span><br><span class="line">} <span class="keyword">else</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出旧的值， a</span></span><br><span class="line">System.out.println(map.replace(<span class="number">1</span>, <span class="string">"aa"</span>));</span><br><span class="line"><span class="comment">// 替换成功，输出新的值， aa</span></span><br><span class="line">System.out.println(map.get(<span class="number">1</span>));</span><br><span class="line"></span><br><span class="line"><span class="comment">// 不存在key为4， 输出 null</span></span><br><span class="line">System.out.println(map.replace(<span class="number">4</span>, <span class="string">"d"</span>));</span><br><span class="line"><span class="comment">// 不存在key为4， 输出 null</span></span><br><span class="line">System.out.println(map.get(<span class="number">4</span>));</span><br></pre></td></tr></table></figure><h2 id="computeIfAbsent-方法"><a href="#computeIfAbsent-方法" class="headerlink" title="computeIfAbsent 方法"></a>computeIfAbsent 方法</h2><p>如果指定的key不存在，则通过指定的<code>K -> V</code>计算出新的值设置为key的值，类似代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (map.get(key) == <span class="keyword">null</span>) {</span><br><span class="line"> V newValue = mappingFunction.apply(key);</span><br><span class="line"> <span class="keyword">if</span> (newValue != <span class="keyword">null</span>)</span><br><span class="line"> map.put(key, newValue);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">map.computeIfAbsent(<span class="number">1</span>, key -> key + <span class="string">" computed"</span>);</span><br><span class="line"><span class="comment">// 存在key为1，则不进行计算，输出值 a</span></span><br><span class="line">System.out.println(map.get(<span class="number">1</span>));</span><br><span class="line"></span><br><span class="line">map.computeIfAbsent(<span class="number">4</span>, key -> key + <span class="string">" computed"</span>);</span><br><span class="line"><span class="comment">// 不存在key为4，则进行计算，输出值 4 computed</span></span><br><span class="line">System.out.println(map.get(<span class="number">4</span>));</span><br></pre></td></tr></table></figure><h2 id="computeIfPresent-方法"><a href="#computeIfPresent-方法" class="headerlink" title="computeIfPresent 方法"></a>computeIfPresent 方法</h2><p>如果指定的key存在，则根据旧的key和value计算新的值newValue, 如果newValue不为<code>null</code>，则设置key新的值为newValue, 如果newValue为<code>null</code>, 则删除该key的值，类似代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (map.get(key) != <span class="keyword">null</span>) {</span><br><span class="line"> V oldValue = map.get(key);</span><br><span class="line"> V newValue = remappingFunction.apply(key, oldValue);</span><br><span class="line"> <span class="keyword">if</span> (newValue != <span class="keyword">null</span>)</span><br><span class="line"> map.put(key, newValue);</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> map.remove(key);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">map.computeIfPresent(<span class="number">1</span>, (key, value) -> (key + <span class="number">1</span>) + value);</span><br><span class="line"><span class="comment">// 存在key为1， 则根据旧的key和value计算新的值，输出 2a</span></span><br><span class="line">System.out.println(map.get(<span class="number">1</span>));</span><br><span class="line"></span><br><span class="line">map.computeIfPresent(<span class="number">2</span>, (key, value) -> <span class="keyword">null</span>);</span><br><span class="line"><span class="comment">// 存在key为2， 根据旧的key和value计算得到null，删除该值，输出 null</span></span><br><span class="line">System.out.println(map.get(<span class="number">2</span>));</span><br></pre></td></tr></table></figure><h2 id="compute-方法"><a href="#compute-方法" class="headerlink" title="compute 方法"></a>compute 方法</h2><p><code>compute</code>方法是<code>computeIfAbsent</code>与<code>computeIfPresent</code>的综合体。</p><h2 id="merge-K-key-V-value-BiFunction-lt-super-V-super-V-extends-V-gt-remappingFunction-方法"><a href="#merge-K-key-V-value-BiFunction-lt-super-V-super-V-extends-V-gt-remappingFunction-方法" class="headerlink" title="merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) 方法"></a>merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) 方法</h2><p>如果指定的key不存在，则设置指定的value值，否则根据key的旧的值oldvalue，value计算出新的值newValue, 如果newValue为<code>null</code>, 则删除该key，否则设置key的新值newValue。类似如下代码：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">V oldValue = map.get(key);</span><br><span class="line">V newValue = (oldValue == <span class="keyword">null</span>) ? value :</span><br><span class="line"> remappingFunction.apply(oldValue, value);</span><br><span class="line"><span class="keyword">if</span> (newValue == <span class="keyword">null</span>)</span><br><span class="line"> map.remove(key);</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line"> map.put(key, newValue);</span><br></pre></td></tr></table></figure><p>示例代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 存在key为1， 输出 a merge</span></span><br><span class="line">System.out.println(map.merge(<span class="number">1</span>, <span class="string">" merge"</span>, (oldValue, newValue) -> oldValue + newValue));</span><br><span class="line"><span class="comment">// 新值为null，删除key，输出 null</span></span><br><span class="line">System.out.println(map.merge(<span class="number">1</span>, <span class="string">" merge"</span>, (oldValue, newValue) -> <span class="keyword">null</span>));</span><br><span class="line"><span class="comment">// 输出 " merge"</span></span><br><span class="line">System.out.println(map.merge(<span class="number">4</span>, <span class="string">" merge"</span>, (oldValue, newValue) -> oldValue + newValue));</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
Java 8之Map新增方法
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
<category term="Map" scheme="http://irusist.github.io/tags/Map/"/>
</entry>
<entry>
<title>Java 8之Collector</title>
<link href="http://irusist.github.io/2016/01/04/Java-8%E4%B9%8BCollector/"/>
<id>http://irusist.github.io/2016/01/04/Java-8之Collector/</id>
<published>2016-01-04T13:17:25.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>Java 8中有一个<code>Collector</code>接口，主要是为Stream中的元素转换成其他值提供的一个接口，在<code>Collectors</code>工具类中有很多<code>Collector</code>接口的实现方式。</p><p>Collector的定义为<code>Collector<T, A, R></code>, 其中泛型参数<code>T</code>表示Stream中元素的类型， <code>A</code>表示定义一个初始容器的类型，<code>R</code>表示最终转换的类型。</p><p>Collector接口主要定义了如下几个方法：</p><ul><li><p>supplier：这个方法主要是生成一个初始容器，用于存放转换的数据。它返回一个<code>Supplier<A></code>类型，用Lambda表示为<code>() -> A</code></p></li><li><p>accumulator: 这个方法是将初始容器与Stream中的每个元素进行计算，它返回一个<code>BiConsumer<A, T></code>类型，用Lambda表示为<code>(A, T) -> void</code></p></li><li><p>combiner: 这个方法用于在并发Stream中，将多个容器组合成一个容器，它返回一个<code>BinaryOperator<A></code>类型，用Lambda表示为<code>(A, A) -> A</code></p></li><li><p>finisher：这个方法用于将初始容器转换成最终的值，它返回一个<code>Function<A, R></code>类型，用Lambda表示为<code>A -> R</code></p></li><li><p>characteristics: 这个方法返回该Collector具有的哪些特征，返回的是一个<code>Set</code>, 分别是<code>CONCURRENT</code>(并发), <code>UNORDERED</code>(未排序)，<code>IDENTITY_FINISH</code>(<code>finisher</code>方法直接返回初始容器)等特征的组合。</p></li></ul><a id="more"></a><p>在<code>Collectors</code>中有一个<code>joining</code>方法，它是将<code>Stream</code>中的字符序列类型的元素串接在一起，下面是一个例子：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 abcd</span></span><br><span class="line">System.out.println(Stream.of(<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"d"</span>).collect(Collectors.joining()));</span><br></pre></td></tr></table></figure><p>下面通过自己实现joining方法来理解如何实现<code>Collector</code>接口。</p><p>定义自己实现的<code>JoinCollector</code>类：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">JoinCollector</span> <span class="keyword">implements</span> <span class="title">Collector</span><<span class="title">CharSequence</span>, <span class="title">StringBuilder</span>, <span class="title">String</span>> </span>{</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Supplier<StringBuilder> <span class="title">supplier</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> StringBuilder::<span class="keyword">new</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> BiConsumer<StringBuilder, CharSequence> <span class="title">accumulator</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> StringBuilder::append;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> BinaryOperator<StringBuilder> <span class="title">combiner</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> StringBuilder::append;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Function<StringBuilder, String> <span class="title">finisher</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> StringBuilder::toString;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Set<Characteristics> <span class="title">characteristics</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> Collections.emptySet();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>其中，<code>supplier</code>方法返回一个<code>StringBuilder</code>对象，用于表示初始容器。</p><p><code>accumulator</code>方法返回的是<code>StringBuilder</code>的<code>append</code>方法的方法引用， 用于将<code>Stream</code>中的元素加入到初始容器<code>StringBuilder</code>中。</p><p><code>combiner</code>方法用于将多个<code>StringBuilder</code>容器通过<code>append</code>方法组合成一个<code>StringBuilder</code>对象。</p><p><code>finisher</code>方法是将<code>StringBuilder</code>对象通过<code>toString</code>方法最终转换成<code>String</code>对象。</p><p>使用自定义的<code>Collector</code>的例子如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 abcd</span></span><br><span class="line">System.out.println(Stream.of(<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"d"</span>).collect(<span class="keyword">new</span> JoinCollector()));</span><br></pre></td></tr></table></figure><p>得到的结果与<code>Collectors.joining</code>方法是一样的。</p>]]></content>
<summary type="html">
Java 8之Collector
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
</entry>
<entry>
<title>Java 8之Optional</title>
<link href="http://irusist.github.io/2016/01/02/Java-8%E4%B9%8BOptional/"/>
<id>http://irusist.github.io/2016/01/02/Java-8之Optional/</id>
<published>2016-01-02T15:25:07.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>由于<code>NullPointerException</code>是Java开发中发生次数最多的一个异常， 所以在Java 8中提供了一个<code>Optional</code>类， 用来避免该异常的发生， 这个类类似于Scala中的<code>Option</code>。</p><p><code>Optional</code>类的所有构造方法都是<code>private</code>的，因此可以使用它的静态方法来初始化，如：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 用来生成一个空值的Optional</span></span><br><span class="line">Optional empty = Optional.empty();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 用来生成一个非空值的Optional</span></span><br><span class="line">Optional<String> notNull = Optional.of(<span class="string">"optional"</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 可以根据传入的值生成空或非空的Optional</span></span><br><span class="line">Optional<String> nullValue = Optional.ofNullable(<span class="keyword">null</span>);</span><br></pre></td></tr></table></figure><a id="more"></a><p>可以使用<code>isPresent</code> 方法来判Optional内的值是否存在，如：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 返回 false</span></span><br><span class="line">System.out.println(Optional.empty().isPresent());</span><br><span class="line"></span><br><span class="line"><span class="comment">// 返回 true</span></span><br><span class="line">System.out.println(Optional.of(<span class="number">1</span>).isPresent());</span><br></pre></td></tr></table></figure><p>使用<code>get</code>方法获取Optional内的值，如果是<code>empty</code>，则抛出<code>NoSuchElementException</code>异常。</p><p>使用<code>ifPresent</code> 方法可以先判断这个值是否存在，如果存在，则 执行一个操作。</p><p><code>filter</code>, <code>map</code>, <code>flatMap</code>等方法与<code>Stream</code>的操作类似， 这里不再说明。</p><p><code>orElse</code> 方法接收一个与Optional类型一致的参数，表示如果这个<code>Optional</code>是empty，则返回这个传入的值。</p><p><code>orElseGet</code>方法接受一个<code>Supplier</code>接口，表示当<code>Optional</code>内的值不存在时，通过<code>Supplier</code>获取到这个值。</p><p><code>orElseThrow</code> 方法接受一个 <code>Supplier</code>接口，表示当<code>Optional</code>内的值不存在时，通过<code>Supplier</code> 获取到一个异常值，并抛出这个异常。</p>]]></content>
<summary type="html">
Java 8之Optional
</summary>
<category term="Java" scheme="http://irusist.github.io/categories/Java/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
</entry>
<entry>
<title>Java 8之default方法</title>
<link href="http://irusist.github.io/2016/01/02/Java-8%E4%B9%8Bdefault%E6%96%B9%E6%B3%95/"/>
<id>http://irusist.github.io/2016/01/02/Java-8之default方法/</id>
<published>2016-01-02T14:26:14.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Java 8中可以在接口定义方法的实现， 称为default方法， 类似用于Scala中的<code>trait</code>， 在<code>Iterable</code>中有类似以下的定义</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">default</span> <span class="keyword">void</span> <span class="title">forEach</span><span class="params">(Consumer<? <span class="keyword">super</span> T> action)</span> </span>{</span><br><span class="line"> Objects.requireNonNull(action);</span><br><span class="line"> <span class="keyword">for</span> (T t : <span class="keyword">this</span>) {</span><br><span class="line"> action.accept(t);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><code>Iterable</code>中的default方法的主要目的是为Java 8的Lambda表达式提供支持， 如果将这个方法定义成普通接口方法，则会对现有的JDK中的其他使用<code>Iterable</code>接口造成影响， 因此提供了default方法的功能。</p><a id="more"></a><p>一个接口中可以定义多个default方法。 下面写个简单的例子说明下default方法的使用</p><p>存在一个父接口， 定义了一个default方法</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Parent</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">default</span> String <span class="title">doIt</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"Parent"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>有一个类实现该接口，使用默认的default方法</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ParentImpl</span> <span class="keyword">implements</span> <span class="title">Parent</span> </span>{</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><code>ParentImpl</code>有一个实现类</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ParentImpl2</span> <span class="keyword">extends</span> <span class="title">ParentImpl</span> </span>{</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">doIt</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"ParentImpl2"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><code>ParentImpl2</code>有一个实现类</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ChildImpl2</span> <span class="keyword">extends</span> <span class="title">ParentImpl2</span> <span class="keyword">implements</span> <span class="title">Child</span> </span>{</span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>有一个接口继承<code>Parent</code>接口</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Child</span> <span class="keyword">extends</span> <span class="title">Parent</span> </span>{</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 重写父接口的default方法</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> String</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">default</span> String <span class="title">doIt</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"Child"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><code>Child</code>有一个实现类，使用<code>Child</code>的default方法</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ChildImpl</span> <span class="keyword">implements</span> <span class="title">Child</span> </span>{</span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>以下为测试代码</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DefaultMethodTest</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"></span><br><span class="line"> Parent parent = <span class="keyword">new</span> ParentImpl();</span><br><span class="line"> <span class="comment">// default方法的实现类可以直接调用default方法</span></span><br><span class="line"> <span class="comment">// 输出 Parent</span></span><br><span class="line"> System.out.println(parent.doIt());</span><br><span class="line"></span><br><span class="line"> Child child = <span class="keyword">new</span> ChildImpl();</span><br><span class="line"> <span class="comment">// Child接口重写了Parent接口的default方法</span></span><br><span class="line"> <span class="comment">// 输出 Child</span></span><br><span class="line"> System.out.println(child.doIt());</span><br><span class="line"></span><br><span class="line"> <span class="comment">// ParentImpl2类重写了Parent接口的default方法</span></span><br><span class="line"> <span class="comment">// 输出 ParentImpl2</span></span><br><span class="line"> Parent parent1 = <span class="keyword">new</span> ParentImpl2();</span><br><span class="line"> System.out.println(parent1.doIt());</span><br><span class="line"></span><br><span class="line"> <span class="comment">// ChildImpl2父类与接口都有default方法， 使用类中定义的default方法</span></span><br><span class="line"> <span class="comment">// 输出 ParentImpl2</span></span><br><span class="line"> Child child1 = <span class="keyword">new</span> ChildImpl2();</span><br><span class="line"> System.out.println(child1.doIt());</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>通过以上的例子中可以得出以下几点：</p><ul><li><p>实现类可以直接使用父接口中定义的default方法</p></li><li><p>接口可以重写父接口中定义的default方法</p></li><li><p>实现类可以重写父接口中定义的default方法</p></li><li><p>当父类与父接口都存在default方法时， 使用父类中重写的default方法</p></li></ul><p>如果一个类实现了2个接口，这2个接口有相同的default方法签名时， 此时会编译失败， 必须在子类中重写这个default方法。</p>]]></content>
<summary type="html">
Java 8之default方法
</summary>
<category term="Java8" scheme="http://irusist.github.io/categories/Java8/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
<category term="Java" scheme="http://irusist.github.io/tags/Java/"/>
</entry>
<entry>
<title>Java 8之基本类型优化</title>
<link href="http://irusist.github.io/2016/01/02/Java-8%E4%B9%8B%E5%9F%BA%E6%9C%AC%E7%B1%BB%E5%9E%8B%E4%BC%98%E5%8C%96/"/>
<id>http://irusist.github.io/2016/01/02/Java-8之基本类型优化/</id>
<published>2016-01-02T13:02:58.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>在Java中, 泛型必须使用引用类型, 而不能使用基本类型。 所以要表示基本类型的列表或者数组时, 必须使用对应基本类型的引用类型, 如<br><code>int</code>对应<code>Integer</code>, <code>long</code>对应<code>Long</code>等, 在基本类型与引用类型可以自动地装箱与拆箱, 但是会有一些性能损失。</p><p>在Java 8的Stream API中提供了<code>of</code>方法，如果传入基本类型的参数，内部其实得到的是一个引用类型的Stream。如下面代码</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 得到的是Integer类型的 Stream</span></span><br><span class="line">Stream<Integer> stream = Stream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>);</span><br></pre></td></tr></table></figure><p>因此， Java 8的提供了一些专门针对基本类型优化的API，如 <code>IntStream</code>, <code>LongStream</code>, <code>DoubleStream</code>, 应该优先使用它们。</p><a id="more"></a><h2 id="定义"><a href="#定义" class="headerlink" title="定义"></a>定义</h2><p>定义基本类型的Stream， 可以使用<code>IntStream</code>, <code>LongStream</code>, <code>DoubleStream</code>的接口静态方法<code>of</code>, <code>range</code>, <code>empty</code>， 下面为例子</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 创建一个空的 IntStream</span></span><br><span class="line">IntStream empty = IntStream.empty();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 创建包含基本类型1， 2， 3的 IntStream</span></span><br><span class="line">IntStream intStream = IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 创建一个包含1到9的 IntStream</span></span><br><span class="line">IntStream range = IntStream.range(<span class="number">1</span>, <span class="number">10</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 创建一个包含1到10的 IntStream</span></span><br><span class="line">IntStream rangeClosed = IntStream.rangeClosed(<span class="number">1</span>, <span class="number">10</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 创建一个包含3的 IntStream</span></span><br><span class="line">IntStream generated = IntStream.generate(() -> <span class="number">3</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 得到一个无限循环的 IntStream, 值为 1, 3, 5, 7 ...</span></span><br><span class="line">IntStream infinite = IntStream.iterate(<span class="number">1</span>, operand -> operand + <span class="number">2</span>);</span><br></pre></td></tr></table></figure><p>也可以基于 int 数组创建 IntStream， 如</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span>[] array = <span class="keyword">new</span> <span class="keyword">int</span>[]{<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>};</span><br><span class="line"><span class="comment">// 包含整个数组的IntStream</span></span><br><span class="line">IntStream arrayStream = Arrays.stream(array);</span><br><span class="line"><span class="comment">// 包含数组的索引位置2开始，4结束（不包含）的IntStream</span></span><br><span class="line">IntStream rangeArray = Arrays.stream(array, <span class="number">2</span>, <span class="number">4</span>);</span><br></pre></td></tr></table></figure><h2 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h2><p>基本类型的Stream，内部使用的都是与基本类型相关的接口函数来进行操作， 进而避免装箱成相应的引用类型， <code>IntStream</code> 主要有以下几个操作方法</p><h3 id="filter方法"><a href="#filter方法" class="headerlink" title="filter方法"></a>filter方法</h3><p><code>filter</code>方法于过滤Stream中的数据，它接收一个 <code>IntPredicate</code> 接口， 它是一个 <code>int -> boolean</code> 的接口函数， 例子代码如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 2， 4， 6</span></span><br><span class="line">IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).filter(elem -> elem % <span class="number">2</span> == <span class="number">0</span>).forEach(System.out::println);</span><br></pre></td></tr></table></figure><h3 id="map-方法"><a href="#map-方法" class="headerlink" title="map 方法"></a>map 方法</h3><p><code>map</code>方法主要是对Stream的元素进行某种映射，转换成另一个基本类型的值， 它接收一个 <code>IntUnaryOperator</code> 接口, 它是一个 <code>int -> int</code> 的函数接口，例子代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 10, 20, 30, 40, 50, 60, 70</span></span><br><span class="line">IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).map(elem -> elem * <span class="number">10</span>).forEach(System.out::println);</span><br></pre></td></tr></table></figure><h3 id="mapToObj-方法"><a href="#mapToObj-方法" class="headerlink" title="mapToObj 方法"></a>mapToObj 方法</h3><p><code>mapToObj</code> 方法主要是将Stream中的元素进行装箱操作， 转换成一个引用类型的值， 它接收一个 <code>IntFunction</code> 接口， 它是一个 <code>int -> R</code> 的函数接口， 例子代码如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出a1, a2, a3, a4, a5, a6, a7</span></span><br><span class="line">IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).mapToObj(elem -> <span class="string">"a"</span> + elem).forEach(System.out::println);</span><br></pre></td></tr></table></figure><h3 id="mapToLong-方法"><a href="#mapToLong-方法" class="headerlink" title="mapToLong 方法"></a>mapToLong 方法</h3><p><code>mapToLong</code> 方法是将Stream中的 元素转换成基本类型<code>long</code>， 它接收一个 <code>IntToLongFunction</code> 接口， 它是一个 <code>int -> long</code> 的函数接口， 例子代码如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 100, 200, 300, 400, 500, 600, 700</span></span><br><span class="line">IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).mapToLong(elem -> elem * <span class="number">100L</span>).forEach(System.out::println);</span><br></pre></td></tr></table></figure><h3 id="mapToDouble-方法"><a href="#mapToDouble-方法" class="headerlink" title="mapToDouble 方法"></a>mapToDouble 方法</h3><p><code>mapToDouble</code> 方法是将Stream中的 元素转换成基本类型<code>double</code>， 它接收一个 <code>IntToDoubleFunction</code> 接口， 它是一个 <code>int -> double</code> 的函数接口， 例子代码如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 1.1, 2.1, 3.1, 4.1, 5.1, 6.1, 7.1</span></span><br><span class="line">IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).mapToDouble(elem -> elem + <span class="number">0.1</span>).forEach(System.out::println);</span><br></pre></td></tr></table></figure><h3 id="min-方法"><a href="#min-方法" class="headerlink" title="min 方法"></a>min 方法</h3><p><code>min</code> 方法获取Stream中最小的元素， 它返回 <code>OptionalInt</code> 类型， 它是一个int版的<code>Optional</code>， 同样是为了避免拆箱装箱操作。 示例代码如下</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出 1</span></span><br><span class="line">System.out.println(IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>).min().getAsInt());</span><br></pre></td></tr></table></figure><h3 id="summaryStatistics-方法"><a href="#summaryStatistics-方法" class="headerlink" title="summaryStatistics 方法"></a>summaryStatistics 方法</h3><p><code>summaryStatistics</code> 方法主要是获取Stream中元素的统计信息， 它返回 <code>IntSummaryStatistics</code>, 示例代码如下:</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">IntSummaryStatistics summary = IntStream.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>).summaryStatistics();</span><br><span class="line"><span class="comment">// 输出 1</span></span><br><span class="line">System.out.println(summary.getMin());</span><br><span class="line"><span class="comment">// 输出 10</span></span><br><span class="line">System.out.println(summary.getMax());</span><br><span class="line"><span class="comment">// 输出 55</span></span><br><span class="line">System.out.println(summary.getSum());</span><br><span class="line"><span class="comment">// 输出 10</span></span><br><span class="line">System.out.println(summary.getCount());</span><br><span class="line"><span class="comment">// 输出 5.5</span></span><br><span class="line">System.out.println(summary.getAverage());</span><br></pre></td></tr></table></figure><p>此外， 还有 <code>flatMap</code>, <code>distinct</code>, <code>sorted</code>, <code>peek</code>, <code>limit</code>, <code>skip</code>, <code>forEach</code>, <code>reduce</code>, <code>collect</code>, <code>anyMatch</code>, <code>allMatch</code>, <code>noneMatch</code>等方法， 与<code>Stream</code>的方法都差不多。</p>]]></content>
<summary type="html">
Java 8之基本类型优化
</summary>
<category term="Java8" scheme="http://irusist.github.io/categories/Java8/"/>
<category term="Java8" scheme="http://irusist.github.io/tags/Java8/"/>
</entry>
<entry>
<title>2015年终总结</title>
<link href="http://irusist.github.io/2015/12/31/2015%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/"/>
<id>http://irusist.github.io/2015/12/31/2015年终总结/</id>
<published>2015-12-31T12:20:51.000Z</published>
<updated>2017-11-06T15:29:11.000Z</updated>
<content type="html"><![CDATA[<p>今天是2015年的最后一天, 这一年总体感觉就是各种不顺, 无论生活还是工作, 感觉总是很压抑.</p><h2 id="生活"><a href="#生活" class="headerlink" title="生活"></a>生活</h2><p>今年唯一比较庆幸的是女儿在年初的时候出生了, 她给我带来了很多幸福, 虽然分开两地, 每次也只有节假日回去的那几天, 可每每想到她的笑脸,瞬间感觉就算再大的委屈也要咽下去, 我相信未来的路一定很美好, 因为我还有父母, 妻子, 女儿, 他们才是我的一切.</p><a id="more"></a><p>就在今年, 爷爷奶奶相继去世了. 虽然这几年, 他们对我们家远远不如其他的叔叔家, 关系也不是那么好, 可是又少了2个亲人, 心情很低落. 人生真是无常啊, 有时候总觉得有些事情, 放一放以后再做, 可是谁又能确保这一放, 以后是否就真的还有机会呢. 人生总是有那么多因错过机会而遗憾的事情, 唯一能做的也就只有把握当下, 抓住每一个机会.</p><p>然后就是房子, 去年就已经签完合同, 本来合同是今年6月份拿房的, 开发商一而再地延期, 并且赔偿金也少得可怜, 维权也没什么后果, 我们都是小人物, 这么大的国家, 难道政府就看着这种现象不断发生, 一点也不考虑制约吗.</p><h2 id="工作-事业"><a href="#工作-事业" class="headerlink" title="工作, 事业"></a>工作, 事业</h2><p>今年的工作好像也没什么进展, 我是个比较内向的人, 不会讲一些好听的话, 也不喜欢做一些唯心的事, 自然也得到某些领导的赏识. 尽职尽责地工作, 可有些时候, 你做得好了反而没有了存在感.在很多公司, 员工的薪水往往是由他们是否被分配到重点项目决定的, 你再有本事, 分点不痛不痒的项目, 你也只能在那天天干瞪眼消磨时间. 某些人就算能力低, 分个重点项目, 就算做得漏洞百出,反而会得到重视. </p><p>一直都向往着一份工作便是一份事业, 有志同道合的同事, 朝着共同的目标努力. 俗话说得好, 机会是留给有准备的人, 我相信总会有那样的机会在未来等着我.</p><h2 id="学习"><a href="#学习" class="headerlink" title="学习"></a>学习</h2><p>技术上主要还是以Java为主, 重温了JVM相关的一些内容, 自发地做了一个分布式跟踪系统, 使用了HBase, 因此对HBase也相应地有了一些了解. 对Scala和Golang零零散散地学习了一些知识.网络方面对Netty有一定了解, Linux系统也在持续学习及应用中.</p><p>明年决定对Scala和Golang系统地学习下, 并写点东西, 数据库相关的内容也要彻底深入地学习下. 对分布式和架构方面也要持续不断地学习. 对NodeJs和Spark也要了解了解.</p><h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>无论2015年如何, 它毕竟已经要过去了, 我相信2016年总会更好的, 因为每个人的命运都是掌握在自己手中. </p>]]></content>
<summary type="html">
2015年终总结
</summary>
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