
what is functionality of requestdispatcher object

The RequestDispatcher allows the dynamic inclusion of web components either by including in the current component or by forwarding to another web component. A typical use is to include a standard menu in all pages. This reduces the amount of duplication of content and if the menu has to change, only one file needs editing.
For more information, visit the following links:
http://www.roseindia.net/help/java/d/requestdispatcher.shtml
http://www.roseindia.net/tutorial/java/servlet/httprequest/include.html