java实现数据的加密解密

import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import sun.misc.BASE64Encoder;

public class Test
{

    private final static String DES  = "DES";
    static String               data = "299995";
    static String               key  = "123hck321";

    public static void main(String[] args)
    {
        try
        {
            String jiami = encrypt(data, key);
            System.out.print("加密:" + jiami);
            byte jiemi[] = decrypt(encrypt(data.getBytes(), key.getBytes()), key.getBytes());
            System.err.println("解密: " + new String(jiemi));
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public static String encrypt(String data, String key) throws Exception
    { 
        // 对string进行BASE64Encoder转换
        byte[] bt = encrypt(data.getBytes(), key.getBytes());
        BASE64Encoder base64en = new BASE64Encoder();
        String strs = new String(base64en.encode(bt));
        
        return strs;
    }

    // 加密代码
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception
    { 

        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);
        
        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    // 解密代码
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception
    { 
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

}