package com.fh.util;

import java.security.MessageDigest;

public class MD5 {

    public static String md5(String str) {

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");

            md.update(str.getBytes());

            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");

            for (int offset = 0; offset < b.length; offset++) {

                i = b[offset];

                if (i < 0)

                    i += 256;

                if (i < 16)

                    buf.append("0");

                buf.append(Integer.toHexString(i));

            }

            str = buf.toString();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return str;

    }

    public static void main(String[] args) {

        System.out.println(md5(""));

        System.out.println(md5("mj1"));

        System.out.println(md5("123456"));

        System.out.println(md5("123456789123456789"));

    }

}