Md5加密算法

 1 package com.Md5;
 2 
 3 import java.security.MessageDigest;
 4 import java.security.NoSuchAlgorithmException;
 5 
 6 public class Md5JdkUtil {
 7     /**
 8      * 将byte数组转化为16进制输出
 9      * @param bytes
10      * @author Administrator
11      * @return String
12      */
13     public static String convertByteToHexString(byte[] bytes) {
14         String result = "";
15         for(int i=0;i<bytes.length;i++) {
16             int temp = bytes[i] & 0xff;
17             String tempHex = Integer.toHexString(temp);
18             if(tempHex.length() < 2) {
19                 result += "0" + tempHex;
20             }else {
21                 result += tempHex;
22             }
23         }
24         
25         return result;
26     }
27     /**
28      * jdk自带的Md5加密
29      * @param message
30      * @return  String
31      */
32     public static String Md5Jdk(String message) {
33         String temp = "";
34         try {
35             MessageDigest md5Digest = MessageDigest.getInstance("MD5");
36             byte[] encodeMd5Digest = md5Digest.digest(message.getBytes());
37             //将encodeMd5Digest字节数组转化为16进制
38             temp = convertByteToHexString(encodeMd5Digest);        
39         } catch (NoSuchAlgorithmException e) {
40             // TODO Auto-generated catch block
41             e.printStackTrace();
42         }
43 
44         return temp;
45     }
46     
47     public static void main(String[] args) {
48         //Md5加密算法
49         String md5Encode = Md5Jdk("951755155");
50         System.out.println("Md5JDK加密后为：" + md5Encode);
51         System.out.println("Md5JDK加密后密文的长度为：" + md5Encode.length());
52     }
53 }