In servlet how to increase session time-out programitacally?

Session:It is the time duration,which starts the starting point of client to server conversation and which terminates the end point of server to client conversation.


Example:
    

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SimpleSession extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    response.setContentType("text/html");
    java.io.PrintWriter out = response.getWriter();
    HttpSession session = request.getSession();
  Start body tag

    out.println("
Session Info
");
    out.println("session Id: " + session.getId() + "

");
    out.println("The SESSION TIMEOUT period is "
        + session.getMaxInactiveInterval() + " seconds.

");
    out.println("Now changing it to 20 minutes.

");
    session.setMaxInactiveInterval(20 * 60);//it can be used to set session programitically
    out.println("The SESSION TIMEOUT period is now "
        + session.getMaxInactiveInterval() + " seconds.");
end body tag
   
  

  }

  
  protected void doPost(HttpServletRequest request,
      HttpServletResponse response) throws ServletException,
      java.io.IOException {

    doGet(request, response);
  }

}

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