import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import sun.misc.BASE64Encoder;

@SuppressWarnings("restriction")

public class MD5 {

   /**利用MD5进行加密*/

  public String EncoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException{

    //确定计算方法

    MessageDigest md5=MessageDigest.getInstance("MD5");

    BASE64Encoder base64en = new BASE64Encoder();

    //加密后的字符串

    String newstr=base64en.encode(md5.digest(str.getBytes("utf-8")));

    return newstr;

  }

  /**判断用户密码是否正确

   *newpasswd 用户输入的密码

   *oldpasswd 正确密码*/

  public boolean checkpassword(String newpasswd,String oldpasswd) throws NoSuchAlgorithmException, UnsupportedEncodingException{

    if(EncoderByMd5(newpasswd).equals(oldpasswd))

      return true;

    else

      return false;

  }

}