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Q. What is the difference between the getRequestDispatcher(String) and getNamedDispatcher(String) methods in the ServletContext Class? |
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NamedDispatcher
Returns a RequestDispatcher object that acts as a wrapper for the named servlet. getNamedDispatcher(String) method takes the name of the Servlet as parameter which is declared via Deployment descriptor. Example: Deployment Descriptor <servlet> <servlet-name>ServletTest</servlet-name> <servlet-class>com.example.ServletTest</servlet-class> </servlet> RequestDispatcher dispatch = request.getNamedDispatcher(?ServletTest??); dispatch.forward(request, response); Note: A servlet instance can determine its name using servletConfig.getServletName(); This method returns the name of the class that implements the Servlet interface or extends the HttpServlet class. RequestDispatcher Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path. RequestDispatcher dispatch = request.getRequestDispatcher("/satya"); Here "/satya" represents the url-pattern element value of the servlet class. <servlet-mapping> <servlet-name>Test</servlet-name> <url-pattern>/satya</url-pattern> </servlet-mapping> |
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