Java password salt

Only the md5 password encryption is easy to launch anti other two user passwords are the same, the same password database saved.
The solution is short in the back of the user's password plus a long character, then calculate md5, the original password so it becomes very difficult, and even if two identical user password, the password stored in the database is not the same anti-launched. This plus the length of the character, referred salt (Salt), result of the encryption in this way, is called salt Hash.

Use Example:
Suppose there are two users and admin ABC, passwords are 123456, registration, a salt access username + MD5 value.
The final calculated password is not the same.

package com.example.shiro;

import org.apache.shiro.crypto.hash.SimpleHash;
import org.apache.shiro.util.ByteSource;

public class TestPasswordSalt {
    public static void main(String[] args) {
        String pwd1 = md5("123456", "admin8d78869f470951332959580424d4bf4f");
        System.out.println(pwd1);
        //密码：d3c59d25033dbf980d29554025c23a75
        String pwd2 = md5("123456", "abc0c23e95fd137ea96c4ef24366b7e6f1f");
        System.out.println(pwd2);
        //密码：ae8bb0dd40e4eddeac081f8e31afdaed
    }

    public static  Final String MD5 (password String, String Salt) {
         // encryption 
        String hashAlgorithmName = "the MD5" ;
         // different result using the same password for encryption different salts: salts 
        ByteSource byteSalt = ByteSource.Util.bytes (Salt);
         // password 
        Object = Source password;
         // encrypted number 
        int hashIterations = 2 ; 
        SimpleHash Result = new new SimpleHash (hashAlgorithmName, Source, byteSalt, hashIterations);
         return result.toString (); 
    } 
}

 See the following table field holds the database table, after logging access username + salt for verification.

username	password	salt
admin	d3c59d25033dbf980d29554025c23a75	8d78869f470951332959580424d4bf4f
abc	ae8bb0dd40e4eddeac081f8e31afdaed	0c23e95fd137ea96c4ef24366b7e6f1f