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RequestDispatcher (Servlet and JavaServer Pages API Documentation)
javax.servlet
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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 committedpublic 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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