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Defines an object that receives requests from the client
 and sends them to any resource (such as a servlet, 
 HTML file, or JSP file) on the server. The servlet
 container creates the RequestDispatcher object,
 which is used as a wrapper around a server resource located
 at a particular path or given by a particular name.
 
This interface is intended to wrap servlets,
 but a servlet container can create RequestDispatcher
 objects to wrap any type of resource.
ServletContext.getRequestDispatcher(java.lang.String), 
ServletContext.getNamedDispatcher(java.lang.String), 
ServletRequest.getRequestDispatcher(java.lang.String)| Method Summary | |
|  void | forward(ServletRequest request,
        ServletResponse response)Forwards a request from a servlet to another resource (servlet, JSP file, or HTML file) on the server. | 
|  void | include(ServletRequest request,
        ServletResponse response)Includes the content of a resource (servlet, JSP page, HTML file) in the response. | 
| Method Detail | 
public void forward(ServletRequest request,
                    ServletResponse response)
             throws ServletException,
                    java.io.IOException
For a RequestDispatcher obtained via 
 getRequestDispatcher(), the ServletRequest 
 object has its path elements and parameters adjusted to match
 the path of the target resource.
 
forward should be called before the response has been 
 committed to the client (before response body output has been flushed).  
 If the response already has been committed, this method throws
 an IllegalStateException.
 Uncommitted output in the response buffer is automatically cleared 
 before the forward.
 
The request and response parameters must be either the same
 objects as were passed to the calling servlet's service method or be
 subclasses of the ServletRequestWrapper or ServletResponseWrapper classes
 that wrap them.
request - a ServletRequest object
				that represents the request the client
 				makes of the servletresponse - a ServletResponse object
				that represents the response the servlet
				returns to the client
ServletException - if the target resource throws this exception
java.io.IOException - if the target resource throws this exception
java.lang.IllegalStateException - if the response was already committed
public void include(ServletRequest request,
                    ServletResponse response)
             throws ServletException,
                    java.io.IOException
The ServletResponse object has its path elements
 and parameters remain unchanged from the caller's. The included
 servlet cannot change the response status code or set headers;
 any attempt to make a change is ignored.
 
The request and response parameters must be either the same
 objects as were passed to the calling servlet's service method or be
 subclasses of the ServletRequestWrapper or ServletResponseWrapper classes
 that wrap them.
request - a ServletRequest object 
					that contains the client's requestresponse - a ServletResponse object 
 					that contains the servlet's response
ServletException - if the included resource throws this exception
java.io.IOException - if the included resource throws this exception| 
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