Requestdispatcher forward method forwards a request from a servlet to another resource servlet, jsp file, or html file on the server. The requestdispatcher class enables your servlet to call another servlet from inside another servlet. If you want to forward request to another web application then you need to put the context app of that application without leading slash, because if the path begins with a it is interpreted as relative to the current context root. Example of using requestdispatcher for servlet collaboration. You can download below example jsp page and java file in. Using this object of requestdispatcher, we are going to call its method forward.
The requestdispatcher interface provides the facility of dispatching the request to another resource it may be html, servlet or jsp. Redirection is a type of response sent back to the client, whereas the forward. Servletrequest has its own path elements and parameters adjusted to match the path of the target resource. Today, we are going to understand how to forward the contents of one servlet to another servlet using the forward method of requestdispatcher object. There are two methods defined in the requestdispatcher interface.
Requestdispatcher servlet api documentation apache tomcat. Introduction to resquest dispatcher in servlet studytonight. This method is used to redirect client request to some other location for further processing,the new. In this example, we will show you how requestdispatcher is used to forward or include response of a resource in a servlet. To forward the client request to another servlet to honour that is, client calls a servlet but response to client is given by another servlet. To include the response output of one servlet into another that is, client gets the response of both servlets. A requestdispatcher forward is used to forward the same request to another resource whereas servletresponse sendredirect is a two step process. Calling servlet from servlet request dispatcher method sendredirect method in servlet. Forward to page path relative to the root of the servletcontext. For a requestdispatcher obtained via getrequestdispatcher, the. But you dont redirect to the jsp then, but to the path that is mapped for the servlet so the site is requested by the client via get again. Project folder we have created a project folder named. Of course it doesnt a post request isnt ment to be dispatched with visual output, that is sent back to the client. In sendredirect, web application returns the response to client with status code 302 redirect with url to send the request.
The servlet container creates the requestdispatcher object, which is used as a wrapper. Using requestdispatcher to forward a request we have implemented the service servletrequest req, servletresponse res of genericservlet. Passing data from servlet to another servlet using requestdispatcher. Servlet requestdispatcher forward and include method. Url rewriting using java servlet difference between servletconfig and servletcontext in. The requestdispatcher interface provides two methods. It forwards the request from one servlet to another resource such as servlet, jsp. This method is used to forward current request to another resource such. Forwards a request from a servlet to another resource servlet, jsp file. The forward method is used to transfer the client request to another resource. Forwarding and including response from other servlets.
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