String loginInfo=new BASE64Encoder().encode(username.getBytes())+""+MD

String loginInfo=new BASE64Encoder().encode(username.getBytes())+"_"+MD5Util.encode(password);//中文名称
package com.itheima.tfy.servlet;


import java.io.IOException;


import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import sun.misc.BASE64Encoder;


import com.itheima.tfy.filter.dao.UserDB;
import com.itheima.tfy.filter.domain.User;
import com.itheima.tfy.util.MD5Util;
//完成用户登录
//把密码和用户名保存到Cookie中
//Cookie的生命周期根据用户的选择来定
public class LoginServlet extends HttpServlet {


public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
String expires=request.getParameter("expires");
User user=UserDB.findUser(username, password);

if(user==null){
response.getWriter().write("错误的用户名或密码!");
return;
}
String loginInfo=new BASE64Encoder().encode(username.getBytes())+"_"+MD5Util.encode(password);//中文名称

Cookie cookie=new Cookie("loginIfo", loginInfo);//loginInfo加密
cookie.setPath(request.getContextPath());
if("month".equals(expires)){
cookie.setMaxAge(1*30*24*60*60);
}else if("forever".equals(expires)){
cookie.setMaxAge(Integer.MAX_VALUE);
}


response.addCookie(cookie);
request.getSession().setAttribute("user", user);
//转向主页
response.sendRedirect(request.getContextPath());
}


public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


doGet(request, response);
}


}