How to deploy a ServletRequestListener to work only for specified Servlets?

[Nigel Chou]

It seems that DD only provides mechanism for Listeners to work for the whole application, instead of some specified Servlet. Am I right?
If it is true. I feel it is a flaw, since sometimes you may want you ServletRequestListener to work not on every request to all the Servlets in the application. It is inefficient.

[sven studde]

I feel it is a flaw, since sometimes you may want you ServletRequestListener to work not on every request to all the Servlets in the application.

What about:

public class MyServlet extends HttpServlet
{
public void doPost(HttpServletRequest request,HttpServletResponse response)

throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<div>I've been requested</div>");
 
...

[ October 15, 2006: Message edited by: sven studde ]

[Ben Souther]

What are you trying to do with the listener?
Is is something that could be done with a filter?

[Lijo Jacob]

The ServletRequestListener is used to listen events on the request. There is no meaning in making it servlet specific. A request can be to any resource, need not be to a servlet.

[Cameron Wallace McKenzie]

People are always curious as to how to get the various listeners working in a web application. I hear that complaint so often, that I put together a flash, multimedia tutorial to demonstrate just that:

http://www.technicalfacilitation.com/examscam/tf/get.php?link=web

This deals with HttpSessionListeners an WebContextListeners, but coding and configuring all of the various Servlet and JSP API listeners is pretty much the same.

Do make sure there is an entry in your web.xml file:

 <listener>
  <description>MyKewlListener</description>
  <display-name>MyKewlListener</display-name>
  <listener-class>com.examscam.web.listener.MyKewlListener</listener-class>
</listener>   

As far as the class goes, it just has to implement the appropriate listener interfaces:

 public class MyKewlListener implements ServletContextListener, HttpSessionListener   

Here's the ear, which contains a functional war file. It was put together using IBM's Rational Application Developer (IRAD), but the war has been tested and runs fine on tomcat.

http://www.technicalfacilitation.com/examscam/tf/vangogh/09lifecyclelisteners.ear

Cheers!

-Cameron McKenzie