记录一段工具代码，很久以前写的加密解密字符串的方法

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/** 
     * 字符串加密 
     * @param passWord 加密密码 
     * @return 
     * @throws Exception 
     */
    public static String encryptPassword(String passWord)throws Exception
    {
//        KeyGenerator keyGenerator = KeyGenerator.getInstance("PBEWithMD5AndDES");  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        KeySpec keySpec = new PBEKeySpec("123123123".toCharArray());
        SecretKey secretKey = keyFactory.generateSecret(keySpec);

        PBEParameterSpec parameterSpec = new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);
        Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, parameterSpec);
        byte passEn[] = cipher.doFinal(passWord.getBytes());
        System.out.println(" haha 1" + new String(passEn,"UTF-8"));
        return bytesToHexString(passEn);
    }

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    /** 
     * 字符串解密 
     * @param passWordEn 加密后的密码 
     * @return 
     * @throws Exception 
     */
    public static String decryptPassword(String passWordEn) throws Exception
    {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        KeySpec keySpec = new PBEKeySpec("123123123".toCharArray());

        SecretKey secretKey = keyFactory.generateSecret(keySpec);
        PBEParameterSpec parameterSpec = new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);

        Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, parameterSpec);
        byte[] passDec = cipher.doFinal(hexStringToBytes(passWordEn));
        return new String(passDec);
    }


    public static String bytesToHexString(byte[] src)
    {
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || src.length <= 0)
        {
            return null;
        }
        for (int i = 0; i < src.length; i++)
        {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2)
            {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

    public static byte[] hexStringToBytes(String hexString)
    {
        if (hexString == null || hexString.equals(""))
        {
            return null;
        }
        hexString = hexString.toUpperCase();
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        byte[] d = new byte[length];
        for (int i = 0; i < length; i++)
        {
            int pos = i * 2;
            d[i] = (byte)(charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
        }
        return d;
    }

    private static byte charToByte(char c)
    {
        return (byte)"0123456789ABCDEF".indexOf(c);
    }
Java