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What are scopes in Java Servlet API?

Posted on 2011-10-04
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Hello,

I was asked this question and I immediately thought of: request, session, application but I think this may be a trick question.  Does a servlet really have scopes?
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Question by:cgray1223
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for_yan earned 2000 total points
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Servlet per se is not an objectand not a varaible, it is  a program that does not have scope but it deals with objects which charcterize different scopes.

At least that is what everyone writes about servlet scope objects:
http://www.exforsys.com/tutorials/j2ee/servlet-basics.html


Servlet Scope Objects

There are four scope objects in servlets which enables sharing information between web components. The scope objects and their corresponding Java classes are listed below:

    • Web Context – javax.servlet.ServletContext
    • Session – javax.servlet.http.HttpSession
    • Request – javax.servlet.HttpServletRequest
    • Page – javax.servlet.jsp.PageContext

You can get attribute values from servlet scope objects using getAttribute method and set new values of attributes using setAttribute method. For example, you can get the client’s IP address by calling getRemoteAddr method of HttpServletRequest class.

Let’s develop an example on how to use servlet scope objects. In this example, we will print the information about the server which hosts our servlet.
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