///<summary><![CDATA[加密解密帮助类]]></summary>
    public class Help_Encrypt
    {

        ///<summary><![CDATA[字符串DES加密函数]]></summary>
        ///<param name="str"><![CDATA[被加密字符串 ]]></param>
        ///<param name="key"><![CDATA[密钥 ]]></param> 
        ///<returns><![CDATA[加密后字符串]]></returns>   
        public static string Encode(string str, string key)
        {
            try
            {
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
                stream2.Write(bytes, 0, bytes.Length);
                stream2.FlushFinalBlock();
                StringBuilder builder = new StringBuilder();
                foreach (byte num in stream.ToArray())
                {
                    builder.AppendFormat("{0:X2}", num);
                }
                stream.Close();
                return builder.ToString();
            }
            catch (Exception) { return "xxxx"; }
        }
        ///<summary><![CDATA[字符串DES解密函数]]></summary>
        ///<param name="str"><![CDATA[被解密字符串 ]]></param>
        ///<param name="key"><![CDATA[密钥 ]]></param> 
        ///<returns><![CDATA[解密后字符串]]></returns>   
        public static string Decode(string str, string key)
        {
            try
            {
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] buffer = new byte[str.Length / 2];
                for (int i = 0; i < (str.Length / 2); i++)
                {
                    int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
                    buffer[i] = (byte)num2;
                }
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
                stream2.Write(buffer, 0, buffer.Length);
                stream2.FlushFinalBlock();
                stream.Close();
                return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());
            }
            catch (Exception) { return ""; }
        }
    }
JAVADES加密解密类
package com.bgxt.messages;
import java.io.UnsupportedEncodingException;
import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec; 
import javax.crypto.spec.IvParameterSpec;
/**
* 字符串工具集合
* @author Liudong
*/
public class StringUtils {

private static final String PASSWORD_CRYPT_KEY = XmlUtil.getConfig().getPasswdKey().substring(0,8); 
//private final static String DES = "DES"; 
//private static final 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.getBy