DES加密

/**
     * DES算法密钥
     */
    private static final byte[] DES_KEY = { 21, 1, -110, 82, -32, -85, -128, -65 };


/**
     * 数据加密，算法（DES）
     * 
     * @param data
     *            要进行加密的数据
     * @return 加密后的数据
     */
    public static String encryptBasedDes(String data) {
        String encryptedData = null;
        try {
            // DES算法要求有一个可信任的随机数源
            SecureRandom sr = new SecureRandom();
            DESKeySpec deskey = new DESKeySpec(DES_KEY);
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(deskey);
            // 加密对象
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key, sr);
            // 加密，并把字节数组编码成字符串
            encryptedData = new BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            log.error("加密错误，错误信息：", e);
            throw new RuntimeException("加密错误，错误信息：", e);
        }
        return encryptedData;
    }

使用时:

String oldPwd = request.getParameter("oldPwd");
        String newPwd = request.getParameter("newPwd");

oldPwd =encryptBasedDes(oldPwd);//DES加密
        newPwd =encryptBasedDes(newPwd);//DES加密