JSP include through a web.xml configuration

Question

I have a website that has many JSP pages and I would like to add some logging lines to each jsp file. I would prefer not to have to edit each jsp file though (it would be time consuming). Is there a way through a configuration change in the webapp web.xml file to make each jsp page first "go through" a servlet (to perform some logic) and then have the servlet pass the request and response on to the jsp file. If so, I could add the logging logic to the servlet and effectively have the logic added to each jsp file.
If anyone has done something like this, please give me some pointers on how to configure it.
Thanks,

Answer 1

It sounds like a servlet filter is what you are after.
http://java.sun.com/products/servlet/Filters.html
Its pretty much exactly what you had, just using a Filter interface instead of a servlet.
Should be something along the lines of this (untested)
In web.xml:
<filter>
<filter-name>jsplogger</servlet-name>
<filter-class>dagger.servlet.JSPLoggerFilter</servlet-class>
</filter>
<filter-mapping>
<filter-name>jsplogger</servlet-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>Filter class:
public class JSPLoggerFilter implements Filter{
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws java.io.IOException, ServletException
  String s=request.getRequestURI();
  System.out.println(s+" "+request.getSession().getId());
  // pass it on down the chain
  chain.doFilter(request, response);
}Cheers,
evnafets