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设置cookie的有效时间获取cookie的值
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>
<%!
String uname ;
%>
<%
boolean flag = false;
Cookie[] cookies = request.getCookies() ;
for(Cookie cookie :cookies){
if(cookie.getName().equals("uname")){
uname = cookie.getValue() ;
flag = true;
}
}
//判断cookie是否生效
if(!flag){
out.print("cookie已经失效");
}
else{
out.print("cookie："+uname);
}
%>
<form action="check.jsp" method="post">
用户名:<input type="text" name="uname" value="<%=(uname==null?"":uname)%>"><br/>
密码:<input type="password" name="upwd"><br/>
<input type="submit" value="登陆"><br/>
</form>
</body>
</html>
check.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8") ;
String name = request.getParameter("uname");
String pwd = request.getParameter("upwd");
//将用户名 加入到Cookie中
Cookie cookie = new Cookie("uname",name);
//设置cookie的有效时间，单位为秒
cookie.setMaxAge(10);
//服务端增加cookie
response.addCookie(cookie) ;
//服务端给客户端响应将cookie给客户端，转发或重定向都可以
response.sendRedirect("A.jsp") ;
%>
</body>
</html>
A.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
</body>
</html>
访问：http://localhost:8080/01_jsp/cookieDemo/login.jsp
初次访问没有设置cookie时显示为失效
填上信息后再次访问
过十秒钟再次访问：
