jsp开发之使用cookie

朱雀 2024-02-18 23:08 66阅读 0赞

1. index.jsp

<%@page import="java.net.URLDecoder"%>
    <%@ 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request中获得cookie对象
        Cookie[] cookies=request.getCookies();
      //登录用户
      String user="";
      //注册的时间
      String date="";
      if(cookies!=null){
    	  //遍历cookie对象的集合
    	  for(int i=0;i<cookies.length;i++){
    		  //如果cookie对象的名称为mrCookie
    		  if(cookies[i].getName().equals("mrCookie")){
    			  //获取用户名
    			  user =URLDecoder.decode(cookies[i].getValue().split("#")[0]);
    			  //获取注册时间
    			  date = cookies[i].getValue().split("#")[1];
    		  }
    	  }
      }
      //如果没有注册
      if("".equals(user)&&"".equals(date)){
    	  
      %>
        游客您好，欢迎您初次光临！
        <form action="deal.jsp"  method="post">
            请输入姓名:<input name="user" type="text" value="">
            <input type="submit" value="确定">
        </form>
      
      
      
      <%	  
    	  
      }else{
      %>
      
      欢迎[<b><%= user %></b>]再次光临<br>
      您注册的时间是:<%= date %>
      
      <%
      
    	  
    	  
    	  
      }
      
      
      %>
    </body>
    </html>

2. deal.jsp

<%@page import="java.net.URLEncoder"%>
    <%@ page import="java.util.Date" %>
    <%@ page import="java.text.SimpleDateFormat" %>
    <%@ 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>
    <%
    request.setCharacterEncoding("utf-8");
    String user =URLEncoder.encode(request.getParameter("user")) ;
    String info=user+"#"+new SimpleDateFormat("YYYY-MM-dd HH:mm:ss").format(new Date());
    //创建并实例化cookie对象
    Cookie cookie =new Cookie("mrCookie",info);
    //设置有效期30天
    cookie.setMaxAge(60*60*24*30);
    response.addCookie(cookie);
    
    
    
    
    
    
    
    
    
    
    %>
    <script type="text/javascript">
    
      window.location.href="index.jsp"
    
    </script>
    </body>
    </html>

3.效果图

![70][]

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/f6392d30a70c46609e4fc45badba0f7c.png