Passing objects using Request domains

Lifecycle: Created by the server before the service method call, passing in the service method. The entire request is over, requesting the end of life.
Scope of action: the entire request chain.
Function: Share data throughout the request chain, most commonly: data processed in the servlet is given to the JSP display, where parameters can be placed in the request domain with the past.

public void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Request.setattribute ("banana", "yellow Banana");
This.getservletcontext (). Getrequestdispatcher ("/servlet/demo4"). Forward (request, response);

String result = "Yellow banana";
Request.setattribute ("result", result);
Request.getrequestdispatcher ("/show.jsp"). Forward (request, response);

Passing objects using Request domains