java Des 加密解密技术

package com.esb;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Des {

    //
    //加密数据
    //
 public static String encrypt(String message, String key, String IV)
   throws Exception {
  Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
  BASE64Decoder base64De = new BASE64Decoder();
  BASE64Encoder base64En = new BASE64Encoder();
  DESKeySpec desKeySpec = new DESKeySpec(base64De.decodeBuffer(key));

  SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
  SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
  IvParameterSpec iv = new IvParameterSpec(base64De.decodeBuffer(IV));
  cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

  byte[] result = cipher.doFinal(message.getBytes("utf-8"));
  return base64En.encodeBuffer(result);
 }
 
 // 解密数据
 public static String decrypt(String message,String key, String IV) throws Exception {
   BASE64Decoder base64De = new BASE64Decoder();
         byte[] bytesrc = base64De.decodeBuffer(message);
         Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");   
         DESKeySpec desKeySpec = new DESKeySpec(base64De.decodeBuffer(key));  
         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  
         SecretKey secretKey = keyFactory.generateSecret(desKeySpec);  
         IvParameterSpec iv = new IvParameterSpec(base64De.decodeBuffer(IV));
         cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);     
         byte[] retByte = cipher.doFinal(bytesrc);    
         return new String(retByte);
 }
 
 public static void main(String[] args) throws Exception {
  String key = "8SpOkb2LJcw=";
  String IV  = "I9RIqgOpVk4=";
  String value="loginName=admin&logintime=2010/03/15 15:01:01 ";
  String jiami=java.net.URLEncoder.encode(value, "utf-8");
  jiami = value;
  System.out.println("需要加密的数据:"+jiami);
  String a= encrypt(jiami, key, IV);
  System.out.println("加密后的数据为:"+a);
  
  String c="hDPqGpcGs4QHl-T5-58nSAAtAW35ZUCpuLXfcjReChzOrzdn9kfiQI1lVnqvvSHE";
         c="hDPqGpcGs4QHl+T5+58nSAAtAW35ZUCpuLXfcjReChzOrzdn9kfiQI1lVnqvvSHE";
  System.out.println("提供的加密后的数据:"+c);
  String b = decrypt(c,key,IV) ;
  System.out.println("解密后的数据:"+b);

 }
}