why cookie.getMaxAge() = -1?_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-01-04 02:05 出处：网络

i have a test like this : cookie.jsp: <html> <head> </head> <body> <% String cookieName=\"SNS\";

相关专题：cookies

i have a test like this :

cookie.jsp:

<html>  
<head>
</head>  
<body>  
<%  
String cookieName="SNS";  
Cookie cookie=new Cookie(cookieName, "maxAgeTest");  
cookie.setMaxAge(60*60);  
response.addCookie(cookie);  
%>  
</body>  
</html>

and read.jsp is :

<html>  
<head>
</hea开发者_StackOverflow社区d>  
<body>  
<table border=1>  
<tr><td>Name</td><td>value</td></tr>  
<%  
Cookie cookies[]=request.getCookies();  
Cookie sCookie=null;  
String svalue=null;  
String sname=null;  
int sage ; 
for(int i=0;i<cookies.length;i++)  
{  
sCookie=cookies[i];  
svalue=sCookie.getValue();  
sname=sCookie.getName();  
sage=sCookie.getMaxAge();
%>  
<tr><td><%=sname%></td><td><%=svalue%></td><td><%=sage%></td></tr>  
<%  
}  
%>  
</table>
</body>  
</html>

but the result is :

Name value maxAge

JSESSIONID DB3561A47B37FCA8CA25EA04B80A26C7 -1

SNS maxAgeTest -1

why the maxAge is -1 ?

and t test IE8,Chrome5,Safari ,the result same

you ain't gonna get it. the browser only sends back name and value of the cookies, no other information.

Because you haven't set the MaxAge (using setMaxAge). So it will have the default value (-1). This means that the cookie will persist until browser shutdown