Example of HttpSession interface

HttpSession interface

Container creates a session id for each user.The container uses this id to identify the particular user.An object of HttpSession can be used to perform two tasks:

1.    bind objects

2.    view and manipulate information about a session, such as the session identifier, creation time, and last accessed time. 

How to get the HttpSessionobject ?

The HttpServletRequest interface provides two methods to get the object of HttpSession:

1.    publicHttpSessiongetSession():Returns the current session associated with this request, or if the request does not have a session, creates one.

2.    publicHttpSessiongetSession(boolean create):Returns the current HttpSession associated with this request or, if there is no current session and create is true, returns a new session.

Commonly used methods of HttpSession interface

1.    public String getId():Returns a string containing the unique identifier value.

2.    public long getCreationTime():Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.

3.    public long getLastAccessedTime():Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.

4.    public void invalidate():Invalidates this session then unbinds any objects bound to it.

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