What is session?

A session is a link between a client and the server. This link represents some identity that makes client unique so that it is known by the server whenever a request is made.

Need to maintain this session?

Whenever a client made a request, the server treats it as a new request. In some applications we require that a series of requests made by a client will associate with one another. So we need to maintain the state of a user.

How to maintain a session?

To maintain a session, servlet container uses various methods to make a particular client unique so that server can easily identify it.

Different ways to maintain session

There are several ways in servlet to maintain session:

  • HttpSession
  • Cookies
  • Hidden Form Field
  • URL Rewritting

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