requestdispatcher.html
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Java 2 Platform EE v1.3: Interface RequestDispatcher
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javax.servlet</FONT>
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Interface RequestDispatcher</H2>
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<DT>public interface <B>RequestDispatcher</B></DL>
<P>
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 <code>RequestDispatcher</code> object,
which is used as a wrapper around a server resource located
at a particular path or given by a particular name.
<p>This interface is intended to wrap servlets,
but a servlet container can create <code>RequestDispatcher</code>
objects to wrap any type of resource.
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<DT><B>See Also: </B><DD><A HREF="../../javax/servlet/ServletContext.html#getRequestDispatcher(java.lang.String)"><CODE>ServletContext.getRequestDispatcher(java.lang.String)</CODE></A>,
<A HREF="../../javax/servlet/ServletContext.html#getNamedDispatcher(java.lang.String)"><CODE>ServletContext.getNamedDispatcher(java.lang.String)</CODE></A>,
<A HREF="../../javax/servlet/ServletRequest.html#getRequestDispatcher(java.lang.String)"><CODE>ServletRequest.getRequestDispatcher(java.lang.String)</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/RequestDispatcher.html#forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)">forward</A></B>(<A HREF="../../javax/servlet/ServletRequest.html">ServletRequest</A> request,
<A HREF="../../javax/servlet/ServletResponse.html">ServletResponse</A> response)</CODE>
<BR>
Forwards a request from
a servlet to another resource (servlet, JSP file, or
HTML file) on the server.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/RequestDispatcher.html#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)">include</A></B>(<A HREF="../../javax/servlet/ServletRequest.html">ServletRequest</A> request,
<A HREF="../../javax/servlet/ServletResponse.html">ServletResponse</A> response)</CODE>
<BR>
Includes the content of a resource (servlet, JSP page,
HTML file) in the response.</TD>
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<A NAME="forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)"><!-- --></A><H3>
forward</H3>
<PRE>
public void <B>forward</B>(<A HREF="../../javax/servlet/ServletRequest.html">ServletRequest</A> request,
<A HREF="../../javax/servlet/ServletResponse.html">ServletResponse</A> response)
throws <A HREF="../../javax/servlet/ServletException.html">ServletException</A>,
java.io.IOException</PRE>
<DL>
<DD>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.
<p>For a <code>RequestDispatcher</code> obtained via
<code>getRequestDispatcher()</code>, the <code>ServletRequest</code>
object has its path elements and parameters adjusted to match
the path of the target resource.
<p><code>forward</code> 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 <code>IllegalStateException</code>.
Uncommitted output in the response buffer is automatically cleared
before the forward.
<p>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 <A HREF="../../javax/servlet/ServletRequestWrapper.html"><CODE>ServletRequestWrapper</CODE></A> or <A HREF="../../javax/servlet/ServletResponseWrapper.html"><CODE>ServletResponseWrapper</CODE></A> classes
that wrap them.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>request</CODE> - a <A HREF="../../javax/servlet/ServletRequest.html"><CODE>ServletRequest</CODE></A> object
that represents the request the client
makes of the servlet<DD><CODE>response</CODE> - a <A HREF="../../javax/servlet/ServletResponse.html"><CODE>ServletResponse</CODE></A> object
that represents the response the servlet
returns to the client<DT><B>Throws:</B><DD><CODE><A HREF="../../javax/servlet/ServletException.html">ServletException</A></CODE> - if the target resource throws this exception<DD><CODE>java.io.IOException</CODE> - if the target resource throws this exception<DD><CODE>java.lang.IllegalStateException</CODE> - if the response was already committed</DL>
</DD>
</DL>
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<A NAME="include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)"><!-- --></A><H3>
include</H3>
<PRE>
public void <B>include</B>(<A HREF="../../javax/servlet/ServletRequest.html">ServletRequest</A> request,
<A HREF="../../javax/servlet/ServletResponse.html">ServletResponse</A> response)
throws <A HREF="../../javax/servlet/ServletException.html">ServletException</A>,
java.io.IOException</PRE>
<DL>
<DD>Includes the content of a resource (servlet, JSP page,
HTML file) in the response. In essence, this method enables
programmatic server-side includes.
<p>The <A HREF="../../javax/servlet/ServletResponse.html"><CODE>ServletResponse</CODE></A> 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.
<p>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 <A HREF="../../javax/servlet/ServletRequestWrapper.html"><CODE>ServletRequestWrapper</CODE></A> or <A HREF="../../javax/servlet/ServletResponseWrapper.html"><CODE>ServletResponseWrapper</CODE></A> classes
that wrap them.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>request</CODE> - a <A HREF="../../javax/servlet/ServletRequest.html"><CODE>ServletRequest</CODE></A> object
that contains the client's request<DD><CODE>response</CODE> - a <A HREF="../../javax/servlet/ServletResponse.html"><CODE>ServletResponse</CODE></A> object
that contains the servlet's response<DT><B>Throws:</B><DD><CODE><A HREF="../../javax/servlet/ServletException.html">ServletException</A></CODE> - if the included resource throws this exception<DD><CODE>java.io.IOException</CODE> - if the included resource throws this exception</DL>
</DD>
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