Java实现des加密 解密要求有界面

下面是一个简单的Java程序，可以实现DES加密和解密，并带有基本的界面。

该程序使用Java Swing库来创建用户界面，使用Java Cryptography Extension (JCE)库来实现DES加密和解密。

界面包括两个文本框和四个按钮。文本框用于输入要加密或解密的文本，按钮用于执行加密和解密操作。

程序代码如下：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class DesEncryptDecrypt extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private static final String ALGORITHM = "DES";
    private static final String TRANSFORMATION = "DES/ECB/PKCS5Padding";
    private static final byte[] KEY = "mykey123".getBytes();

    private JTextArea inputTextArea, outputTextArea;

    public DesEncryptDecrypt() {
        super("DES Encrypt/Decrypt");

        JPanel inputPanel = new JPanel(new BorderLayout());
        inputPanel.add(new JTextArea("Input"), BorderLayout.NORTH);
        inputTextArea = new JTextArea(5, 20);
        inputPanel.add(inputTextArea, BorderLayout.CENTER);

        JPanel outputPanel = new JPanel(new BorderLayout());
        outputPanel.add(new JTextArea("Output"), BorderLayout.NORTH);
        outputTextArea = new JTextArea(5, 20);
        outputPanel.add(outputTextArea, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        JButton encryptButton = new JButton("Encrypt");
        encryptButton.addActionListener(this);
        buttonPanel.add(encryptButton);
        JButton decryptButton = new JButton("Decrypt");
        decryptButton.addActionListener(this);
        buttonPanel.add(decryptButton);

        add(inputPanel, BorderLayout.NORTH);
        add(outputPanel, BorderLayout.CENTER);
        add(buttonPanel, BorderLayout.SOUTH);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {
        new DesEncryptDecrypt();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        try {
            Key key = new SecretKeySpec(KEY, ALGORITHM);
            Cipher cipher = Cipher.getInstance(TRANSFORMATION);
            switch (e.getActionCommand()) {
            case "Encrypt":
                cipher.init(Cipher.ENCRYPT_MODE, key);
                byte[] encryptedBytes = cipher.doFinal(inputTextArea.getText().getBytes());
                outputTextArea.setText(new String(encryptedBytes));
                break;
            case "Decrypt":
                cipher.init(Cipher.DECRYPT_MODE, key);
                byte[] decryptedBytes = cipher.doFinal(inputTextArea.getText().getBytes());
                outputTextArea.setText(new String(decryptedBytes));
                break;
            }
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(this, "Error: " + ex.getMessage());
        }
    }

}

该程序使用了一个固定的密钥作为加密解密算法的秘钥，为了更安全，使用者应该使用至少128位的随机密钥，并将该密钥储存在安全的地方。