Java实现MD5加密

import java.security.MessageDigest;

import sun.misc.BASE64Encoder;

public class Md5Tools{
 
 /**
  * md5加密
  * @param old
  * @return
  *
  */
 public static String Md5String(String old) {
  try {
   //java自带工具包MessageDigest
   MessageDigest md5 = MessageDigest.getInstance("md5");
   //实现Base64的编码
   BASE64Encoder base64 = new BASE64Encoder();
   //进行加密
   String newStr = base64.encode(md5.digest(old.getBytes("utf-8")));
   return newStr;//返回加密后的字符

  } catch (Exception e) {
   throw new RuntimeException(e);
  }

 }
}