jsp实现简单用户7天内免登录

2020-07-26 23:15:20

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本文实例为大家分享了jsp实现简单用户7天内免登录的具体代码，供大家参考，具体内容如下

（1）登陆页面：login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%><!DOCTYPE html><html><head><meta charset="utf-8"><title>Insert title here</title></head><body><form action="LoginServlet" method="post">  用户名：<input type="text" name="username" value="${cookie.cook_name.value }"/><br/>  <input type="checkbox" name="chkCookie" value="7"/>记住我，7天内免登录<br/>  <input type="submit" value="登录"/><br/>  <a href="sessionUser.jsp" rel="external nofollow" >验证session</a>  <a href="cookieUser.jsp" rel="external nofollow" >验证cookie</a></form></body></html>

（2）跳转页面：cookieUser.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%><!DOCTYPE html><html><head><meta charset="utf-8"><title>Insert title here</title></head><body><%    //从浏览器获取cookie   Cookie[] cookies = request.getCookies();   String uname = null;      //判断语句条件小技巧   if(null != cookies){    for(Cookie cookie:cookies){   //遍历本地浏览器中的所有cookie   if(cookie.getName().equals("cook_name")){    //把cookie中的用户名取出    uname = cookie.getValue();   }   //out.print("<p>name: " + cookie.getName()+"</p>");   //out.print("<p>value: " + cookie.getValue()+"</p>");       }        }   //判断cookie有没有失效   if(null != uname){   out.print("<p>用户名："+uname +"</p>");   }   else{   response.sendRedirect("login.jsp");   }%></body></html>

（3）Servlet文件：LoginServlet类

package com.servlet;import java.io.IOException;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 javax.servlet.http.HttpSession;/** * Servlet implementation class LoginServlet */@WebServlet("/LoginServlet")public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L;      /**   * @see HttpServlet#HttpServlet()   */  public LoginServlet() {    super();    // TODO Auto-generated constructor stub  } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //获取用户登录名 String username = request.getParameter("username");  //获取7天内是否免登录 String day7 = request.getParameter("chkCookie"); int cookie_day = 1; if(null != day7 && day7.equals("")){    cookie_day = Integer.valueOf(day7); }  //创建cookie Cookie cookie = new Cookie("cook_name",username);  //设置Cookie有限期 //cookie.setMaxAge(6);//有效期6秒 cookie.setMaxAge(3600 * 24 * cookie_day);//设置7天免登录  //写入cookie到浏览器 response.addCookie(cookie); response.sendRedirect("cookieUser.jsp");   } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。

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