Invoking a Filter By Calling a Servlet

If we need to invoke a Filter when calling a particular servlet the following is the snippet for doing as such

   <filter>

         <filter-name>ViewerFilter</filter-name>

        <filter-class>org.xxx.ViewerFilter</filter-class>

    </filter>

   <filter-mapping>

        <filter-name>ViewerFilter</filter-name>

        <servlet-name>ViewerServlet</servlet-name>

   </filter-mapping>

<servlet>

<servlet-name>ViewerServlet</servlet-name>

<servlet-class>org.xxx.ViewerServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ViewerServlet</servlet-name>

<url-pattern>/frameset</url-pattern>

</servlet-mapping>

So with the above snippet in “web.xml” if we call the “ViewerServlet” the  “ViewerFilter” is automatically executed.