Creating or Accessing a Session

HttpServletRequest interface provides below methods to create a session.

   getSession()

   getSession(boolean create)

HttpSession getSession()

If the request includes a session id cookie, then it finds the session matching with id, if there is no session matching with the id then it create one. If there is no session id in the request, then it creates a session.

HttpSession getSession(boolean create)

Reurns the current HttpSession associated with this request or, 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.

The getSession() method should be called before anything is written to the response stream. Once the session is created, you can add data to your session using setAttribute method, and retrieve using getAttribute and remove using removeAttribute method.

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