Servlet concepts doubts

[p hasini]

1. If we set setMaxInactiveInterval(int interval) to high value,does it mean the user's information will be maintained , after a user exits a browser and reopens the browser again.

2. We can create a Servlet in 2 ways.By extending GenericServlet or by extendiing HttpServlet.
Since GenericServlet and HttpServlet implement Servlet interface , can we write a servlet as

   public class MyServlet implements Servlet
{
}
 

3. To create a session, we use

 HttpSession session=HttpServletRequest.getSession(true);   

What is the difference between HttpServletReuqest.getSession(true) and HttpServletRequest.getSession(false)

4. How do we get a ServletConfig object.Are the following ways correct:

  ServletConfig config=MyServlet.getServletConfig();
ServletConfig config=getServletConfig();
ServletConfig config=HttpServletRequest.getServletConfig();  

5. How do we get a ServletContext object.Can we use both these ways:

  ServletContect context=getServletContext();
ServletContext context=config.getServletContext();  

[Karthik Jayachandran]

3. For getSession(true), it will check whether there is a session already existing for the user. If a session is existing, it will return that session object, otherwise it will create a new one and returns it.

And for getSession(false), this will check whether a session exists or not. If yes, then it returns that session object, or else it will return null.

[William Brogden]

1. If we set setMaxInactiveInterval(int interval) to high value,does it mean the user's information will be maintained , after a user exits a browser and reopens the browser again.

A session is only good for a single browser session just like the name implies. Note that the only user information in a session is what the programmer puts there, nothing is put there automatically.

For clearing your doubts about servlets, read the API - for example javax.servlet.http.HttpSession for the behavior of sessions.

Bill

[Rahul Nair]

Hello,

Just to clear my doubt, How many ways we can create a session in Servlet ? Is there any other way except request.getSession() call ?

Thanks,

Rahul

[Ulf Dittmer]

As to #2, yes, you can write a servlet that way. But you'd have to duplicate everything GenericServlet and HttpServlet do, and in particular you'd need to implement the "service" method and its handling of the various HTTP methods.

[Bosun Bello]

You can create a session in a servlet by calling getSession() or the overloaded method that takes a boolean, with a value of 'true' on the request object.

BTW, This information is readily available in the API or in the FAQ here.

Rahul Nair wrote:Hello,

Just to clear my doubt, How many ways we can create a session in Servlet ? Is there any other way except request.getSession() call ?

Thanks,

Rahul