Java怎么实现对称加密DES和AES

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实验内容和要求

采用Java实现采用对称密码算法的应用软件，所用算法包括DES算法和AES算法。要求该软件具有图形用户界面，能生成密钥，以及对字符串和文件进行加解密

参考代码

// 文件名： test01.javaimport javax.crypto.*;import javax.crypto.spec.*;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.*;import java.nio.charset.StandardCharsets;public class test01 extends JFrame implements ActionListener {    private JFileChooser fileChooser = new JFileChooser();    private JTextArea inputArea = new JTextArea(10, 40);    private JTextArea outputArea = new JTextArea(10, 40);    private JButton encryptButton = new JButton("加密");    private JButton decryptButton = new JButton("解密");    private JButton fileButton = new JButton("选择文件");    private JComboBox<String> algorithmBox = new JComboBox<String>(new String[] {"DES", "AES"});    private JLabel keyLabel = new JLabel("密钥:");    private JTextField keyField = new JTextField(20);    public test01() {        super("对称加密算法实现");        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        JPanel mainPanel = new JPanel();        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));        JPanel inputPanel = new JPanel();        inputPanel.add(new JLabel("输入:"));        inputPanel.add(new JScrollPane(inputArea));        JPanel outputPanel = new JPanel();        outputPanel.add(new JLabel("输出:"));        outputPanel.add(new JScrollPane(outputArea));        JPanel buttonPanel = new JPanel();        buttonPanel.add(encryptButton);        buttonPanel.add(decryptButton);        buttonPanel.add(fileButton);        buttonPanel.add(algorithmBox);        buttonPanel.add(keyLabel);        buttonPanel.add(keyField);        mainPanel.add(inputPanel);        mainPanel.add(outputPanel);        mainPanel.add(buttonPanel);        encryptButton.addActionListener(this);        decryptButton.addActionListener(this);        fileButton.addActionListener(this);        setContentPane(mainPanel);        pack();        setVisible(true);    }    public void actionPerformed(ActionEvent e) {        if (e.getSource() == encryptButton) {            encrypt();        } else if (e.getSource() == decryptButton) {            decrypt();        } else if (e.getSource() == fileButton) {            chooseFile();        }    }    private void chooseFile() {        int returnValue = fileChooser.showOpenDialog(this);        if (returnValue == JFileChooser.APPROVE_OPTION) {            File file = fileChooser.getSelectedFile();            try {                BufferedReader reader = new BufferedReader(new FileReader(file));                inputArea.setText("");                String line = reader.readLine();                while (line != null) {                    inputArea.append(line);                    line = reader.readLine();                    if (line != null) {                        inputArea.append("\n");                    }                }                reader.close();            } catch (IOException e) {                JOptionPane.showMessageDialog(this, "Error reading file: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);            }        }    }    private void encrypt() {        try {            String algorithm = (String) algorithmBox.getSelectedItem();            String keyString = keyField.getText();            byte[] keyBytes = keyString.getBytes(StandardCharsets.UTF_8);            SecretKey key;            if (algorithm.equals("DES")) {                key = new SecretKeySpec(keyBytes, "DES");            } else {                key = new SecretKeySpec(keyBytes, "AES");            }            Cipher cipher = Cipher.getInstance(algorithm);            cipher.init(Cipher.ENCRYPT_MODE, key);            String input = inputArea.getText();            byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8);            byte[] outputBytes = cipher.doFinal(inputBytes);            String output = new String(outputBytes, StandardCharsets.UTF_8);            outputArea.setText(output);        } catch (Exception e) {            JOptionPane.showMessageDialog(this, "Error encrypting: "                    + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);        }    }    private void decrypt() {        try {            String algorithm = (String) algorithmBox.getSelectedItem();            String keyString = keyField.getText();            byte[] keyBytes = keyString.getBytes();            SecretKey key;            if (algorithm.equals("DES")) {                key = new SecretKeySpec(keyBytes, "DES");            } else {                key = new SecretKeySpec(keyBytes, "AES");            }            Cipher cipher = Cipher.getInstance(algorithm);            cipher.init(Cipher.DECRYPT_MODE, key);            String input = inputArea.getText();            byte[] inputBytes = input.getBytes();            byte[] outputBytes = cipher.doFinal(inputBytes);            String output = new String(outputBytes);            outputArea.setText(output);        } catch (Exception e) {            JOptionPane.showMessageDialog(this, "Error decrypting: " +                    e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);        }    }    public static void main(String[] args) {        new test01();    }}

实现效果：

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