HttpSession session = request.getSession(false)

原创于 2009-01-14 14:08:15 发布 · 660 阅读

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本文详细介绍了如何通过Java Servlet API中的getSession方法获取或创建HTTP会话。文章解释了该方法的参数含义及其返回值，强调了为了保持会话正确，在响应提交前调用此方法的重要性。

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getSession
public HttpSession getSession(boolean create)Returns the current HttpSession associated with this request or, if if there is no current session and create is true, returns a new session.
If create is false and the request has no valid HttpSession, this method returns null.

To make sure the session is properly maintained, you must call this method before the response is committed. If the container is using cookies to maintain session integrity and is asked to create a new session when the response is committed, an IllegalStateException is thrown.

Parameters:
true - to create a new session for this request if necessary; false to return null if there's no current session
Returns:
the HttpSession associated with this request or null if create is false and the request has no valid session