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ServletContext, PageContext HttpSesstion and HttpServletRequest

Richard Teston
Ranch Hand

Joined: Feb 12, 2002
Posts: 89
What are the difference in storing values within ServletContext, PageContext, HttpSession and HttpServletRequest? What is/are the significance of each scope in web application developing?

The Code is the Programmer
William Brogden
Author and all-around good cowpoke

Joined: Mar 22, 2000
Posts: 12761
ServletContext = all users in entire web application can use
HttpSession = only one user (typically identified by cookie) can use. An application may manage many sessions.
HttpServletRequest = data that only exists during one request for one user
PageContext = a concept that is only used in JSP for variables that don't get passed if the request is forwarded
It is sorta covered in the JavaRanch Style Guide.
subject: ServletContext, PageContext HttpSesstion and HttpServletRequest
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