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Session Tracking
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Using sessions in servlets is straightforward and involves four basic steps. Here is a summary: Accessing the session object associated with the current request. Call request.getSession to get an HttpSession object, which is a simple hash table for storing user-specific data. Looking up information associated with a session. Call getAttribute on the HttpSession object, cast the return value to the appropriate type, and check whether the result is null. Storing information in a session. Use setAttribute with a key and a value. Discarding session data. Call removeAttribute to discard a specific value. Call invalidate to discard an entire session. Call logout to log the client out of the Web server
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