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‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.coderfromscratch</groupId>
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<artifactId>json-parsing-tutorial</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!-- JACKSON -->
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>2.9.9</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.9.9.3</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>
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<artifactId>jackson-datatype-jsr310</artifactId>
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<version>2.9.9</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter</artifactId>
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<version>RELEASE</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/com/coderfromscratch/jsonparsing/Json.java‎

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package com.coderfromscratch.jsonparsing;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.*;
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import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
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import java.io.IOException;
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public class Json {
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private static ObjectMapper objectMapper = getDefaultObjectMapper();
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private static ObjectMapper getDefaultObjectMapper() {
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ObjectMapper defaultObjectMapper = new ObjectMapper();
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defaultObjectMapper.registerModule(new JavaTimeModule());
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defaultObjectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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return defaultObjectMapper;
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}
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public static JsonNode parse(String src) throws IOException {
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return objectMapper.readTree(src);
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}
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public static <A> A fromJson(JsonNode node , Class<A> clazz) throws JsonProcessingException {
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return objectMapper.treeToValue(node, clazz);
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}
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public static JsonNode toJson(Object a) {
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return objectMapper.valueToTree(a);
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}
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public static String stingify(JsonNode node) throws JsonProcessingException {
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return generateString(node, false);
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}
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public static String prettyPrint(JsonNode node) throws JsonProcessingException {
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return generateString(node, true);
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}
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private static String generateString(JsonNode node, boolean pretty) throws JsonProcessingException {
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ObjectWriter objectWriter = objectMapper.writer();
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if ( pretty )
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objectWriter = objectWriter.with(SerializationFeature.INDENT_OUTPUT);
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return objectWriter.writeValueAsString(node);
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}
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}

‎src/test/java/com/coderfromscratch/jsonparsing/JsonTest.java‎

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package com.coderfromscratch.jsonparsing;
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import com.coderfromscratch.jsonparsing.pojo.AuthorPOJO;
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import com.coderfromscratch.jsonparsing.pojo.BookPOJO;
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import com.coderfromscratch.jsonparsing.pojo.DayPOJO;
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import com.coderfromscratch.jsonparsing.pojo.SimpleTestCaseJsonPOJO;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.JsonNode;
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import org.junit.jupiter.api.Test;
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import java.io.IOException;
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import static org.junit.jupiter.api.Assertions.*;
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class JsonTest {
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private String simpleTestCaseJsonSource = "{ \n" +
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" \"title\": \"Coder From Scratch\", \n" +
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" \"author\": \"Rui\"\n" +
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"}";
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private String dayScenario1 = "{\n" +
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" \"date\": \"2019-12-25\",\n" +
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" \"name\": \"Christmas Day\"\n" +
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"}";
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private String authorBookScenario= "{\n" +
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" \"authorName\": \"Rui\",\n" +
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" \"books\": [\n" +
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" {\n" +
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" \"title\": \"title1\",\n" +
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" \"inPrint\": true,\n" +
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" \"publishDate\": \"2019-12-25\"\n" +
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" },\n" +
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" {\n" +
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" \"title\": \"title2\",\n" +
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" \"inPrint\": false,\n" +
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" \"publishDate\": \"2019-01-01\"\n" +
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" }\n" +
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" ]\n" +
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"}";
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@Test
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void parse() throws IOException {
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JsonNode node = Json.parse(simpleTestCaseJsonSource);
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assertEquals(node.get("title").asText() , "Coder From Scratch");
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}
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@Test
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void fromJson() throws IOException {
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JsonNode node = Json.parse(simpleTestCaseJsonSource);
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SimpleTestCaseJsonPOJO pojo = Json.fromJson(node , SimpleTestCaseJsonPOJO.class);
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assertEquals(pojo.getTitle() , "Coder From Scratch");
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}
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@Test
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void toJson() {
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SimpleTestCaseJsonPOJO pojo = new SimpleTestCaseJsonPOJO();
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pojo.setTitle("Testing 123");
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JsonNode node = Json.toJson(pojo);
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assertEquals(node.get("title").asText() , "Testing 123");
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}
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@Test
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void stingify() throws JsonProcessingException {
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SimpleTestCaseJsonPOJO pojo = new SimpleTestCaseJsonPOJO();
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pojo.setTitle("Testing 123");
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JsonNode node = Json.toJson(pojo);
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System.out.println(Json.stingify(node));
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System.out.println(Json.prettyPrint(node));
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}
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@Test
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void dayTestScenario1() throws IOException {
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JsonNode node = Json.parse(dayScenario1);
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DayPOJO pojo = Json.fromJson(node , DayPOJO.class);
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assertEquals("2019-12-25", pojo.getDate().toString());
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}
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@Test
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void authorBookScenario1() throws IOException {
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JsonNode node = Json.parse(authorBookScenario);
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AuthorPOJO pojo = Json.fromJson(node , AuthorPOJO.class);
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System.out.println("Author : " + pojo.getAuthorName());
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for (BookPOJO bP : pojo.getBooks()) {
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System.out.println("Book : " + bP.getTitle());
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System.out.println("Is In Print? " + bP.isInPrint());
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System.out.println("Date : " + bP.getPublishDate());
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}
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}
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}

‎src/test/java/com/coderfromscratch/jsonparsing/pojo/AuthorPOJO.java‎

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package com.coderfromscratch.jsonparsing.pojo;
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import java.util.List;
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public class AuthorPOJO {
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private String authorName;
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private List<BookPOJO> books;
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public String getAuthorName() {
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return authorName;
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}
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public void setAuthorName(String authorName) {
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this.authorName = authorName;
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}
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public List<BookPOJO> getBooks() {
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return books;
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}
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public void setBooks(List<BookPOJO> books) {
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this.books = books;
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}
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}

‎src/test/java/com/coderfromscratch/jsonparsing/pojo/BookPOJO.java‎

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package com.coderfromscratch.jsonparsing.pojo;
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import java.time.LocalDate;
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public class BookPOJO {
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private String title;
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private boolean inPrint;
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private LocalDate publishDate;
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public boolean isInPrint() {
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return inPrint;
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}
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public void setInPrint(boolean inPrint) {
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this.inPrint = inPrint;
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}
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public LocalDate getPublishDate() {
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return publishDate;
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}
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public void setPublishDate(LocalDate publishDate) {
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this.publishDate = publishDate;
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}
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}

‎src/test/java/com/coderfromscratch/jsonparsing/pojo/DayPOJO.java‎

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package com.coderfromscratch.jsonparsing.pojo;
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import java.time.*;
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public class DayPOJO {
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private String name;
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private LocalDate date;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public LocalDate getDate() {
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return date;
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}
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public void setDate(LocalDate date) {
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this.date = date;
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}
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}

‎src/test/java/com/coderfromscratch/jsonparsing/pojo/SimpleTestCaseJsonPOJO.java‎

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package com.coderfromscratch.jsonparsing.pojo;
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public class SimpleTestCaseJsonPOJO {
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private String title;
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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}

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