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JavaWeb基础 Cookie maxAge大于0 等于0

2017-12-05 21:27 211 查看

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javaEE：7
javaSE：1.8
JSTL：1.2.2
server：tomcat 8.5
browser：Chrome
os：windows7 x64
ide：MyEclipse 2017

当maxAge>0时

addCookie.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'addCookie.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<h2>客户端进行保存cookie</h2>
<%
// cookie就是一个请求头

// 创建cookie
Cookie cookie = new Cookie("name","cnblogs-jizuiku");

cookie.setMaxAge(60*60);
// 添加cookie
response.addCookie(cookie);

%>
</body>
</html>

浏览器访问指定页面

查看cookie

当maxAge=0时

addCookie.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'addCookie.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<h2>客户端进行保存cookie</h2>
<%
// cookie就是一个请求头

// 创建cookie
Cookie cookie = new Cookie("name","cnblogs-jizuiku");

cookie.setMaxAge(60*60);
// 添加cookie
response.addCookie(cookie);

%>
</body>
</html>

delCookie.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'addCookie.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<h2>删除名字为name的cookie</h2>
<%
// cookie就是一个请求头

// 创建cookie
Cookie cookie = new Cookie("name","");
// 将maxAge=0
// 客户端访问后，名字是name的cookie的将会被删除
cookie.setMaxAge(0);
// 添加cookie
response.addCookie(cookie);

%>
</body>
</html>

浏览器访问 addCookie.jsp 并查看cookie

浏览器访问 delCookie.jsp 并查看cookie

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