md5算法

 1 public static void main(String[] args) throws NoSuchAlgorithmException {
 2 
 3       MessageDigest digest = MessageDigest.getInstance("md5");
 4 
 5       String password = "123456";

 9       byte [] result = digest.digest(password.getBytes());
10 
11       StringBuffer buffer  = new StringBuffer();
12 
13       for(byte b : result){ 
15           //0xff是十六进制，十进制为255
19          int nuber =  b & 0xff;
21          String str = Integer.toHexString(nuber);
23          if(str.length()==1){
25             buffer.append("0"); 
27          }
29          buffer.append(str);
33       } 
35       //这就是MD5加密得到的值
37       System.out.println(buffer);
38 
39    }