Java MD5加密

 1 package cn.com.cxsw.utils;
 2 
 3 import java.security.MessageDigest;
 4 
 5 
 6 public class MD5 {
 7 
 8     /**
 9      * MD5加密
10      * 
11      * @param message
12      *            要进行MD5加密的字符串
13      * @return 加密结果为32位字符串
14      */
15     public static String getMD5(String message) {
16         MessageDigest messageDigest = null;
17         StringBuffer md5StrBuff = new StringBuffer();
18         try {
19             messageDigest = MessageDigest.getInstance("MD5");
20             messageDigest.reset();
21             messageDigest.update(message.getBytes("UTF-8"));
22 
23             byte[] byteArray = messageDigest.digest();
24             for (int i = 0; i < byteArray.length; i++) {
25                 if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
26                     md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
27                 else
28                     md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
29             }
30         } catch (Exception e) {
31             throw new RuntimeException();
32         }
33         return md5StrBuff.toString().toUpperCase();// 字母大写
34     }
35 
36     
37     public static void main(String[] args) {
38         String psw = "admin";
39         System.out.println(getMD5(psw));
40     }
41 
42 }