java md5加密

package com.shop.tools;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {
 static MessageDigest md = null;
 static {
  try {
   md = MessageDigest.getInstance("MD5");
  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

 public static String getMD5(String str) {
  byte[] bs = md.digest(str.getBytes());
  String str1="";
  for(byte b:bs)
   str1+=String.format("%x", b);
  return str1;
 }

}