| javax.servlet.RequestDispatcher
| forward | | public void forward(ServletRequest request, ServletResponse response) throws ServletException, IOException(Code) | | Forwards a request from
a servlet to another resource (servlet, JSP file, or
HTML file) on the server. This method allows
one servlet to do preliminary processing of
a request and another resource to generate
the response.
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.
Parameters:
request - a ServletRequest objectthat represents the request the clientmakes of the servlet
Parameters:
response - a ServletResponse objectthat represents the response the servletreturns to the client
exception:
ServletException - if the target resource throws this exception
exception:
IOException - if the target resource throws this exception
exception:
IllegalStateException - if the response was already committed |
| include | | public void include(ServletRequest request, ServletResponse response) throws ServletException, IOException(Code) | | Includes the content of a resource (servlet, JSP page,
HTML file) in the response. In essence, this method enables
programmatic server-side includes.
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.
Parameters:
request - a ServletRequest object that contains the client's request
Parameters:
response - a ServletResponse object that contains the servlet's response
exception:
ServletException - if the included resource throws this exception
exception:
IOException - if the included resource throws this exception |
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