INTERVIEW QUESTIONS J2EE SERVLET DETAILS

Question: What is servlet context and what it takes actually as parameters?

Answer: Servlet context is an object which is created as soon as the Servlet gets initialized.Servlet context object is contained in Servlet Config. With the context object u can get access to specific
resource (like file) in the server and pass it as a URL to be displayed as a next screen with the help of RequestDispatcher
eg :-

ServletContext app = getServletContext();
RequestDispatcher disp;
if(b==true)
disp = app.getRequestDispatcher
("jsp/login/updatepassword.jsp");
else
disp = app.getRequestDispatcher
("jsp/login/error.jsp");

this code will take user to the screen depending upon the value of b.

in ServletContext u can also get or set some variables which u would
like to retreive in next screen.
eg
context.setAttribute("supportAddress", "[email protected]");

Better yet, you could use the web.xml context-param element to
designate the address, then read it with the getInitParameter method
of ServletContext.

There are some methods in context object with the help of which u can
get the server (or servlet container) information.

Apart from all this with the help of ServletContext u can implement
ServletContextListener and then use the get-InitParametermethod to
read context initialization parameters as the basis of data that will
be made available to all servlets and JSP pages.

Servlet context is an object which is created as soon as the Servlet gets initialized.Servlet context object is contained in Servlet Config. With the context object u can get access to specific
resource (like file) in the server and pass it as a URL to be displayed as a next screen with the help of RequestDispatcher
eg :-

ServletContext app = getServletContext();
RequestDispatcher disp;
if(b==true)
disp = app.getRequestDispatcher
("jsp/login/updatepassword.jsp");
else
disp = app.getRequestDispatcher
("jsp/login/error.jsp");

this code will take user to the screen depending upon the value of b.

in ServletContext u can also get or set some variables which u would
like to retreive in next screen.
eg
context.setAttribute("supportAddress", "[email protected]");

Better yet, you could use the web.xml context-param element to
designate the address, then read it with the getInitParameter method
of ServletContext.

There are some methods in context object with the help of which u can
get the server (or servlet container) information.

Apart from all this with the help of ServletContext u can implement
ServletContextListener and then use the get-InitParametermethod to
read context initialization parameters as the basis of data that will
be made available to all servlets and JSP pages.
Source: CoolInterview.com

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