content: package com.alimama.mdrill.adhoc;
  
  public class MD5 {
  	public static String getMD5(byte[] source) {
  	  String s = "";
  	  char hexDigits[] = {       
  	     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',  'e', 'f'}; 
  	   try
  	   {
  	    java.security.MessageDigest md = java.security.MessageDigest.getInstance( "MD5" );
  	    md.update( source );
  	    byte tmp[] = md.digest();       
  	                                           
  	    char str[] = new char[16 * 2];   
  	                                       
  	    int k = 0;                       
  	    for (int i = 0; i < 16; i++) {    
  	                                       
  	     byte byte0 = tmp[i];           
  	     str[k++] = hexDigits[byte0 >>> 4 & 0xf];  
  	                                              
  	     str[k++] = hexDigits[byte0 & 0xf];       
  	    } 
  	    s = new String(str);                     
  	   }catch( Exception e )
  	   {
  	    e.printStackTrace();
  	   }
  	   return s;
  	 }
  	
  	public static String getMD5(String str) {
  		  return getMD5(str.getBytes());
  	}
  
  }
  