session how to configure the expiration time

There are two general methods:
1. Write the Home Page following two:
the HttpSession = Request.getSession the session (to true);
session.setMaxInactiveInterval (3600); // 3600 seconds, 3600 seconds Note that the server, not the client end
2. web.xml project provided:
<the session-config>
<-the session timeout> 60 </-the session timeout>
</ the session-config>
60 here is 60 minutes.
Another method provided in the server side, because the different server configurations different, this is not to say, two or more will be enough.