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Разработан шифр цезаря с использование GUI #4

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Разработан шифр цезаря с использование GUI #4

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138 changes: 138 additions & 0 deletions CaesarCipherGUI.java
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import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;

public class CaesarCipherGUI extends JFrame {

private static final String ALPHABET = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ";
private static final String ALPHABET_ENG = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private final JTextArea inputTextArea;
private final JTextArea outputTextArea;
private final JTextField keyTextField;

//Структура GUI
public CaesarCipherGUI() {
super("Шифр Цезаря");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(800, 600);
setResizable(false);
setLayout(new BorderLayout());
inputTextArea = new JTextArea();
outputTextArea = new JTextArea();
JScrollPane inputScrollPane = new JScrollPane(inputTextArea);
JScrollPane outputScrollPane = new JScrollPane(outputTextArea);

JPanel keyPanel = new JPanel();
JLabel keyLabel = new JLabel("Ключ (сдвиг):");
keyTextField = new JTextField(5);
keyPanel.add(keyLabel);
keyPanel.add(keyTextField);

JPanel buttonPanel = new JPanel();
JButton encryptButton = new JButton("Шифровать");
JButton decryptButton = new JButton("Расшифровать");
JButton openFileButton = new JButton("Открыть файл");
buttonPanel.add(openFileButton);
buttonPanel.add(encryptButton);
buttonPanel.add(decryptButton);

JPanel textPanel = new JPanel(new GridLayout(1, 2));
textPanel.add(inputScrollPane);
textPanel.add(outputScrollPane);
add(keyPanel, BorderLayout.NORTH);
add(textPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);

openFileButton.addActionListener(e -> openFile());
encryptButton.addActionListener(e -> encryptText());
decryptButton.addActionListener(e -> decryptText());

setVisible(true);
}

//Реализация открытия файла
private void openFile() {
JFileChooser fileChooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("Текстовые файлы", "txt");
fileChooser.setFileFilter(filter);
int returnVal = fileChooser.showOpenDialog(this);

if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
inputTextArea.setText(sb.toString());
} catch (IOException ex) {
JOptionPane.showMessageDialog(this, "Ошибка при чтении файла: " + ex.getMessage(), "Ошибка", JOptionPane.ERROR_MESSAGE);
}
}
}

//Реализация шифрования
private void encryptText() {
try {
int key = Integer.parseInt(keyTextField.getText());
validateKey(key);
String text = inputTextArea.getText();
String encryptedText = caesarCipher(text, key);
outputTextArea.setText(encryptedText);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "Введите корректный ключ (число).", "Ошибка", JOptionPane.ERROR_MESSAGE);
} catch (IllegalArgumentException e) {
JOptionPane.showMessageDialog(this, e.getMessage(), "Ошибка", JOptionPane.ERROR_MESSAGE);
}
}

//Реализация расшифровки
private void decryptText() {
try {
int key = Integer.parseInt(keyTextField.getText());
validateKey(key);
String text = inputTextArea.getText();
String decryptedText = caesarCipher(text, -key);
outputTextArea.setText(decryptedText);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "Введите корректный ключ (число).", "Ошибка", JOptionPane.ERROR_MESSAGE);
} catch (IllegalArgumentException e) {
JOptionPane.showMessageDialog(this, e.getMessage(), "Ошибка", JOptionPane.ERROR_MESSAGE);
}
}

private String caesarCipher(String text, int key) {
StringBuilder result = new StringBuilder();
key = (key % ALPHABET.length() + ALPHABET.length()) % ALPHABET.length();

for (char character : text.toUpperCase().toCharArray()) {
if (ALPHABET.indexOf(character) != -1) {
int originalPosition = ALPHABET.indexOf(character);
int newPosition = (originalPosition + key) % ALPHABET.length();
char newCharacter = ALPHABET.charAt(newPosition);
result.append(newCharacter);
} else if (ALPHABET_ENG.indexOf(character) != -1){
int originalPosition = ALPHABET_ENG.indexOf(character);
int newPosition = (originalPosition + key) % ALPHABET_ENG.length();
char newCharacter = ALPHABET_ENG.charAt(newPosition);
result.append(newCharacter);
}
else {
result.append(character);
}
}
return result.toString();
}

private void validateKey(int key) {
if (key < 0 || key >= ALPHABET.length()) {
throw new IllegalArgumentException("Ключ должен быть в диапазоне от 0 до " + (ALPHABET.length() - 1));
}
}

public static void main(String[] args) {
SwingUtilities.invokeLater(CaesarCipherGUI::new);
}
}