RE: Is it possible to intercept all requests and be serviced by a ser vlet?

[Chippada, Sreeni]

That will solve my issue.

Thank you very much,
Sreeni

-----Original Message-----
From: Tim Funk [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, May 18, 2004 10:18 AM
To: Tomcat Users List
Subject: Re: Is it possible to intercept all requests and be serviced by a
ser vlet?

It sounds like using a Filter would be easier. With a filter - you can use 
the Servlet API to get a Dispatcher for the servlet you wish to call. For 
example, this filter reroute all requests to  FooServlet:

package more.cowbell;

import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;

public class ReRouteFilter implements Filter {

     public void init(FilterConfig filterConfig) throws ServletException {
         ;
     }

    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain)
               throws IOException, ServletException {
       request.getRequestDispatcher("/FooServlet").forward(request,
response);
    }

    public void destroy() {
        ;
    }
}

-----------
Then in $CATALINA_HOME/conf/web.xml
     <filter>
         <filter-name>ReRoute Filter</filter-name>
         <filter-class>more.cowbell.ReRouteFilter</filter-class>
     </filter>
     <!-- Trap everything going to the default servlet-->
     <filter-mapping>
         <filter-name>ReRoute Filter</filter-name>
         <servlet-name>default</servlet-name>
     </filter-mapping>
     <!-- Trap by file extension html-->
     <filter-mapping>
         <filter-name>ReRoute Filter</filter-name>
         <url-pattern>*.html</url-pattern>
     </filter-mapping>
-----------

-Tim

Chippada, Sreeni wrote:

> Hi Tim,
>       Thanks for your reply.
>       I know how to create a valve. But I do not know how to execute a
> servlet from a valve. I will be glad if you can you can tell me how to ro
> point me to appropriate resources.
> 
>       Also, I do not know how to configure the filters in the server.xml.
> Appreciate any help.
> 
> Thanks,
> Sreeni
> 
> -----Original Message-----
> From: Tim Funk [mailto:[EMAIL PROTECTED] 
> Sent: Tuesday, May 18, 2004 7:50 AM
> To: Tomcat Users List
> Subject: Re: Is it possible to intercept all requests and be serviced by a
> ser vlet?
> 
> You can use a Valve.
> 
> Or you can use a Filter configured in $CATALINA_HOME/conf/server.xml and
the
> 
> class would live in the common/ classloader
> 
> -Tim
> 
> Chippada, Sreeni wrote:
> 
>>Hi,
>>     I am using Tomcat 5. I need all the requests be serviced by a
>>particular servlet irrespective of the web apps deployed. Is there a way
> 
> to
> 
>>do it?
> 
>  

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