Java版MD5加密算法

 

调用方法为：

 

Encript.md5("www.young-sun.com");

 

 

 

View Code

 1 package com.youngsun.lbt; 
 2 
 3 import java.security.MessageDigest;
 4 
 5 publicclass Encript { 
 6     //十六进制下数字到字符的映射数组
 7     privatefinalstatic String[] hexDigits = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"}; 
 8     /**把inputString加密*/
 9     publicstatic String md5(String inputStr){ 
10         return encodeByMD5(inputStr); 
11     } 
12     /** 
13     * 验证输入的密码是否正确
14     * @param password 真正的密码（加密后的真密码）
15     * @param inputString 输入的字符串
16     * @return验证结果，boolean类型
17 */
18     publicstaticboolean authenticatePassword(String password,String inputString){ 
19         if(password.equals(encodeByMD5(inputString))){ 
20             returntrue; 
21         }else{ 
22             returnfalse; 
23         } 
24     } 
25     /**对字符串进行MD5编码*/
26     privatestatic String encodeByMD5(String originString){ 
27         if (originString!=null) { 
28             try { 
29                 //创建具有指定算法名称的信息摘要
30                 MessageDigest md5 = MessageDigest.getInstance("MD5"); 
31                 //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算
32                 byte[] results = md5.digest(originString.getBytes()); 
33                 //将得到的字节数组变成字符串返回  
34                 String result = byteArrayToHexString(results); 
35                 return result; 
36             } catch (Exception e) { 
37                 e.printStackTrace(); 
38             } 
39         } 
40         returnnull; 
41     } 
42     /** 
43     * 轮换字节数组为十六进制字符串
44     * @param b 字节数组
45     * @return十六进制字符串
46 */
47     privatestatic String byteArrayToHexString(byte[] b){ 
48         StringBuffer resultSb = new StringBuffer(); 
49         for(int i=0;i<b.length;i++){ 
50             resultSb.append(byteToHexString(b[i])); 
51         } 
52         return resultSb.toString(); 
53     } 
54     //将一个字节转化成十六进制形式的字符串
55     privatestatic String byteToHexString(byte b){ 
56         int n = b; 
57         if(n<0) 
58         n=256+n; 
59         int d1 = n/16; 
60         int d2 = n%16; 
61         return hexDigits[d1] + hexDigits[d2]; 
62     } 
63 }