Java tutorial
//package com.java2s; import java.security.MessageDigest; public class Main { public static String md5(String str) throws Exception { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(str.getBytes()); byte byteData[] = md.digest(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < byteData.length; i++) { sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1)); } return sb.toString(); } }