用Cookie实现一天免登录功能

Servlet程序:

package com.westos.untitle2; import com.westos.untitle2.CityService.UserService; import com.westos.untitle2.bean.User; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.List; @WebServlet(name = "Cookie4Servlet") public class Cookie4Servlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("utf-8"); request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); String username=request.getParameter("username"); String password=request.getParameter("password"); UserService userService=new UserService(); List<User> list=userService.setUser(); if (username==null||password==null){ Cookie[] cookie=request.getCookies(); for (Cookie c:cookie){ if(c.getName().equals("username")){ username=c.getValue(); }else if(c.getName().equals("password")){ password=c.getValue(); } } } if(username.equals("")||password.equals("")){ request.getRequestDispatcher("login2.html").forward(request,response); }else{ for(User user:list){ if(user.getUsername().equals(username)&&user.getPassword().equals(password)){ Cookie cookie1=new Cookie("username",username); Cookie cookie2=new Cookie("password",password); cookie1.setMaxAge(60*60); cookie2.setMaxAge(60*60); response.addCookie(cookie1); response.addCookie(cookie2); request.getRequestDispatcher("success.html").forward(request,response); }else{ request.getRequestDispatcher("login2.html").forward(request,response); } } } } } package com.westos.untitle2; import com