public class SomeInterceptor implements MethodBeforeAdvice {

  public void before(Method method, Object[] objects, Object o)
      throws Throwable {
      
    ActionMapping mapping=(ActionMapping)objects[0];
    ActionForm form=(ActionForm)objects[1];
    HttpServletRequest request=(HttpServletRequest)objects[2];
    HttpServletResponse response=(HttpServletResponse)objects[3];
     
    DispatchAction action=(DispatchAction)o;
    ActionServlet servlet=(ActionServlet)action.getServlet();
    ...

  }  
}

public class SomeAction extends DispatchAction {

  ...

  public ActionForward somefunction(ActionMapping mapping, ActionForm form,
      HttpServletRequest request, HttpServletResponse response)
      throws Exception {
    ...
  }

  ...
}