jsp实现简单用户7天内免登录

时间：2021-05-26

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。

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