Maintaining Client State
Many applications require that a series of requests from a client be associated with one another. For example, the Duke's Bookstore application saves the state of a user's shopping cart across requests. Web-based applications are responsible for maintaining such state, called a session, because HTTP is stateless. To support applications that need to maintain state, Java servlet technology provides an API for managing sessions and allows several mechanisms for implementing sessions.
Accessing a Session
Sessions are represented by an HttpSession object. You access a session by calling the getSession method of a request object. This method returns the current session associated with this request, or, if the request does ...
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