MD5

package com.md5;

import java.security.MessageDigest;

public class Md5 {

		/**
		 * @param args
		 */
		public static void main(String[] args) throws Exception{
			// TODO Auto-generated method stub
	       StringBuffer buffer=new StringBuffer();
		   char [] chars={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
		   String src="abc"; 
	       byte[] bytes=src.getBytes();
	       MessageDigest md= MessageDigest.getInstance("MD5");
	       byte [] targ =md.digest(bytes);
	       
	       for(byte b:targ)
	       {
	    	   buffer.append(chars[(b >> 4) &0x0f]);//高四位
	    	   buffer.append(chars[b &0x0f]);//低四位
	       }
	       System.out.println(buffer.toString());
	       System.out.println(targ.length);
	       
		}

	}