session

How to configure the session timeout in servlet

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The session timeout in a web application can be configurable in two ways 1) Timeout in the deployment descriptor (web.xml) – Specified the timeout value in “minute” , enclose with “session-config” element. <web-app …> <session-config> <session-timeout>20</session-timeout> </session-config> </web-app> The above setting is apply for the entire web application, and session will be kill by container …

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How to check whether the session is existed?

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There are two ways to detect whether the session is existed. 1) request.getSession(); + session.isNew() – Retrieve a session from “request.getSession();”, this function will always return a session no matter what, it’s equivalent to request.getSession(true);. The only problem is you do not know whether this is new or existed session. – Later you can check …

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