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jsp实现简单用户7天内免登录

2020年05月13日  | 移动技术网IT编程  | 我要评论

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移动技术网。

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