Difference Betwixt The Getrequestdispatcher Together With Getnameddispatcher Inwards Servletcontext?

The ServletContext course of educational activity provides 2 methods getRequestDispatcher(String url-pattern) and getNamedDispatcher(String name), which tin plough over notice last used to dispatch a asking to a especial servlet. The primary divergence betwixt getRequestDispatcher() together with getNamedDispatcher() method is that old accepts a URL blueprint or path spell after agrees amongst a Servlet mention defined inwards deployment descriptor or web.xml file, both render an event of RequestDispatcher class, which tin plough over notice farther piece of job to forwards or redirect a asking inwards Java spider web application. Let' run into roughly to a greater extent than especial most these 2 methods together with how they work.

getRequestDispatcher(String url-pattern)

This method is defined inwards ServletContext course of educational activity together with it returns a RequestDispatcher object that acts equally a wrapper for the resrouce located at the given URL blueprint or path, for example, if nosotros guide keep next servlet mapping inwards our deployment descriptor :

<servlet-mapping>
<servlet-name>InfoServlet</servlet-name>
<url-pattern>/info</url-pattern>
</servlet-mapping>

than

RequestDispatcher dispatch = request.getRequestDispatcher("/info");

volition render RequestDispatcher for InfoServlet, hither /info represents the url-pattern of the InfoServlet.

You tin plough over notice equally good piece of job RequestDispatcher to forward a asking to a JSP page, equally shown below.

RequestDispatcher dispatch = request.getRequestDispatcher("/index.jsp");

Here path to index.jsp is relative to the origin of the spider web application, that's why nosotros guide keep a forwards slash prefix: "/index.jsp" to forwards the request, only telephone band dispatch.forward(request, response) where asking together with response are HttpServletRequest together with HttpServletRespose object.

If you lot are interested to larn to a greater extent than most asking forwarding inwards Servlet, you lot tin plough over notice farther see books)

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