#region DESEnCode DES加密

    public static string DESEnCode(string pToEncrypt, string sKey)

    {

       // string pToEncrypt1 = HttpContext.Current.Server.UrlEncode(pToEncrypt);

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);     

        //建立加密对象的密钥和偏移量

        //原文使用ASCIIEncoding.ASCII方法的GetBytes方法

        //使得输入密码必须输入英文文本

        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

        MemoryStream ms = new MemoryStream();

        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);     

        cs.Write(inputByteArray, , inputByteArray.Length);

        cs.FlushFinalBlock();     

        StringBuilder ret = new StringBuilder();

        foreach (byte b in ms.ToArray())

        {

            ret.AppendFormat("{0:X2}", b);

        }

        ret.ToString();

        return ret.ToString();

    }

    #endregion    

    #region DESDeCode DES解密

    public static string DESDeCode(string pToDecrypt, string sKey)

    {

        //    HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey);

        //    HttpContext.Current.Response.End();

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();     

        byte[] inputByteArray = new byte[pToDecrypt.Length / ];

        for (int x = ; x < pToDecrypt.Length / ; x++)

        {

            int i = (Convert.ToInt32(pToDecrypt.Substring(x * , ), ));

            inputByteArray[x] = (byte)i;

        }     

        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

       MemoryStream ms = new MemoryStream();

        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

        cs.Write(inputByteArray, , inputByteArray.Length);

        cs.FlushFinalBlock();     

        StringBuilder ret = new StringBuilder();     

       // return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));

        return System.Text.Encoding.Default.GetString(ms.ToArray());

    }

    #endregion  

<span style="color: #888888;">import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.IvParameterSpec;     

public class Des {

    private byte[] desKey;     

    //解密数据

    public static String decrypt(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);

    }     

    public static byte[] encrypt(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"));

    }     

    public static byte[] convertHexString(String ss)

    {

    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;

    }      

    public static void main(String[] args) throws Exception {

        String key = "11111111";

        String value="aa";

        String jiami=java.net.URLEncoder.encode(value, "utf-8").toLowerCase();     

        System.out.println("加密数据:"+jiami);

        String a=toHexString(encrypt(jiami, key)).toUpperCase();     

        System.out.println("加密后的数据为:"+a);

        String b=java.net.URLDecoder.decode(decrypt(a,key), "utf-8") ;

        System.out.println("解密后的数据:"+b);     

    }     

    public static String toHexString(byte b[]) {

        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();

    }     

}

</span>