Java加密解密器

今天用Java类里自带的编码解码做了 一个加密解密器。其实我没做什么就是做了个界面。

还有key是固定八个字符，我改成不是八个字符也可以了。

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Encrypt extends JFrame{

	private static final long serialVersionUID = 1L;
	JLabel lb1 = new JLabel("原文:");
	JTextArea txt = new JTextArea(8,35);
	JScrollPane jsTxt = new JScrollPane(txt);
	JLabel lb = new JLabel("KEY:");
	JTextField pwd = new JTextField(10);
	JButton encry = new JButton("加密");
	JButton decry = new JButton("解密");
	JLabel lb2 = new JLabel("加/解密后:");
	JTextArea showArea = new JTextArea(8,35);
	JScrollPane jsShowArea = new JScrollPane(showArea);
	public Encrypt(String title) throws HeadlessException {
		super(title);
	}
	public static void main(String[] args) {
		new Encrypt("Encrypt").start();
	}
	public void start(){
		JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
		JPanel leftPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
		JPanel rightPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
		JPanel downPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
		BorderLayout layout = new BorderLayout(5,5);
		this.setLayout(layout);
		this.setSize(400, 395);
		topPanel.add(lb1);
		topPanel.add(jsTxt);
		this.add("North", topPanel);
		leftPanel.add(lb);
		leftPanel.add(pwd);
		this.add("West", leftPanel);
		rightPanel.add(encry);
		encry.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(txt.getText().length()==0){
					JOptionPane.showMessageDialog(null, "加密内容不能为空", "提示", JOptionPane.INFORMATION_MESSAGE);
					return ;
				}
				showArea.setText(encrypt(txt.getText(),pwd.getText()));
			}
		});
		rightPanel.add(decry);
		decry.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(txt.getText().length()==0){
					JOptionPane.showMessageDialog(null, "解密内容不能为空", "提示", JOptionPane.INFORMATION_MESSAGE);
					return ;
				}
				showArea.setText(decrypt(txt.getText(),pwd.getText()));
			}
		});
		this.add("East", rightPanel);
		downPanel.add(lb2);
		downPanel.add(jsShowArea);
		this.add("South", downPanel);
		this.setResizable(false);
		this.setVisible(true);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	  /**
     * 加密逻辑方法
     * @param message
     * @param key
     * @return
     * @throws Exception
     */
    private static byte[] encryptProcess(String message, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        return cipher.doFinal(message.getBytes("UTF-8"));
    }

    /**
     * 解密逻辑方法
     * @param message
     * @param key
     * @return
     * @throws Exception
     */
    private static String decryptProcess(String message,String key) throws Exception {
            byte[] bytesrc =convertHexString(message);
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
            cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
            byte[] retByte = cipher.doFinal(bytesrc);
            return new String(retByte);
    }

    /**
     * 16进制数组数转化
     * @param ss
     * @return
     */
    private static byte[] convertHexString(String ss) throws Exception {
        byte digest[] = new byte[ss.length() / 2];
        for(int i = 0; i < digest.length; i++)
        {
	        String byteString = ss.substring(2 * i, 2 * i + 2);
	        int byteValue = Integer.parseInt(byteString, 16);
	        digest[i] = (byte)byteValue;
        }
        return digest;
    }

    /**
     * 十六进制数转化
     * @param b
     * @return
     * @throws Exception
     */
    private static String toHexString(byte b[]) throws Exception {
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            String plainText = Integer.toHexString(0xff & b[i]);
            if (plainText.length() < 2)
                plainText = "0" + plainText;
            hexString.append(plainText);
        } 

        return hexString.toString();
    }

    private static String fixKey(String key){
    	if(key.length()>8){
        	key = key.substring(0, 8);
        }else{
        	while(key.length()<8){
        		key+='0';
        	}
        }
    	return key;
    }
    /**
     * 加密方法
     */
    public static String encrypt(String message,String key){
        String enStr = null;
        if(key.length()!=8){
        	key = fixKey(key);
        }
        System.out.println(key+"......"+key.length());
        try {
             String orignStr=java.net.URLEncoder.encode(message, "utf-8");
             enStr=toHexString(encryptProcess(orignStr, key));
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "加密参数异常！", "错误", JOptionPane.OK_OPTION);
        }
        return enStr;
    }

    /**
     * 解密方法
     */
    public static String decrypt(String message,String key){
        String decStr = null;
        if(key.length()!=8){
        	key = fixKey(key);
        }
        System.out.println(key+"......"+key.length());
        try {
            decStr = java.net.URLDecoder.decode(decryptProcess(message,key), "utf-8") ;
        }catch (Exception e) {
        	JOptionPane.showMessageDialog(null, "解密参数异常！", "错误", JOptionPane.OK_OPTION);
        }
        return decStr;
    }
}

经过测试。确实可以加解密。