package com.cn.peitest; import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import sun.misc.BASE64Encoder; 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; } }