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@TransactionType(value=NOT_SUPPORTED) public interface RequestDispatcher
Defines an object that receives requests from the client and sends them to
any resource (such as a servlet or HTML 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 or HTML file) on the server. |
void |
include(ServletRequest request,
ServletResponse response)
Includes the content of a resource (servlet, HTML file) in the response. |
Method Detail |
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void forward(ServletRequest request, ServletResponse response) throws ServletException, 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
IOException
- if the target resource throws this exception
IllegalStateException
- if the response was already committedvoid include(ServletRequest request, ServletResponse response) throws ServletException, 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
IOException
- if the included resource throws this exception
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