<%@ page import="java.net.CookieHandler" %><%--
Created by IntelliJ IDEA.
User: DELL
Date: 2018/4/19
Time: 17:06
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.net.*,java.util.*,java.io.*" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
//session
//获取session创建的时间
Date createTime = new Date(session.getCreationTime());
//获取最后访问页面的时间
Date lastAccessTime = new Date(session.getLastAccessedTime());
String title = "再次访问";
Integer visitCount = new Integer(0);
String visitCountKey = new String("visitCount");
String userIDKey = new String("userID");
String userID = new String("ABCD");
// 检测网页是否由新的访问用户
if (session.isNew()) {
title = "访问";
session.setAttribute(userIDKey, userID);
session.setAttribute(visitCountKey, visitCount);
} else {
visitCount = (Integer) session.getAttribute(visitCountKey);
visitCount += 1;
userID = (String) session.getAttribute(userIDKey);
session.setAttribute(visitCountKey, visitCount);
if (visitCount >= 2) {
// session.removeAttribute(userIDKey);
//销毁session，清零;
session.invalidate();
}
}
%>
<h1>设置Cookie</h1>
<ul>
<li>名称：<%= request.getParameter("userName")%>
</li>
<li>url:<%= request.getParameter("url")%>
</li>
</ul>
<h2>session</h2>
<table border="1" align="center">
<tr bgcolor="#949494">
<th>Session 信息</th>
<th>值</th>
</tr>
<tr>
<td>id</td>
<td><% out.print(session.getId()); %></td>
</tr>
<tr>
<td>创建时间</td>
<td><% out.print(createTime); %></td>
</tr>
<tr>
<td>最后访问时间</td>
<td><% out.print(lastAccessTime); %></td>
</tr>
<tr>
<td>用户 ID</td>
<td><% out.print(userID); %></td>
</tr>
<tr>
<td>访问次数</td>
<td><% out.print(visitCount); %></td>
</tr>
</table>
<%--</script>--%>
</html>
在这里博主做了一个小小的判断，当访问次数大于等于2的时候，session会销毁然后进行清零重新计算。