How to obtain the requestdispatcher object

Three methods are available.Request dispatcherObject.

A.Javax. servlet. servletrequestOfGetrequestdispatcher (string path)Method, wherePathIt can be a relative path, but it cannot get out of the currentServletContext. IfPathTake"/Is resolved to the root of the current context.

B.Javax. servlet. servletcontextOfGetrequestdispatcher (string path)Method, wherePathMust start with"/", The path is relative to the currentServletContext. YesServletcontextOfGetcontext (string uripath)Get anotherServletContext, and you can switch to a server resource link in the external context.

C.Javax. servlet. servletcontextOfGetnameddispatcher (string name)Get the nameNameOneWebResources, includingServletAndJSPPage. The Resource Name isWebApplication Deployment description fileWeb. xml.