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📄 requestdispatcher.html

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<!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><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" title="interface in javax.servlet">ServletRequest</A>&nbsp;request,                    <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A>&nbsp;response)             throws <A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A>,                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></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" title="class in javax.servlet"><CODE>ServletRequestWrapper</CODE></A> or <A HREF="../../javax/servlet/ServletResponseWrapper.html" title="class in javax.servlet"><CODE>ServletResponseWrapper</CODE></A> classes that wrap them.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>request</CODE> - a <A HREF="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet"><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" title="interface in javax.servlet"><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" title="class in javax.servlet">ServletException</A></CODE> - if the target resource throws this exception<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if the target resource throws this exception<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if the response was already committed</DL></DD></DL><HR><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" title="interface in javax.servlet">ServletRequest</A>&nbsp;request,                    <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A>&nbsp;response)             throws <A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A>,                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></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" title="interface in javax.servlet"><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" title="class in javax.servlet"><CODE>ServletRequestWrapper</CODE></A> or <A HREF="../../javax/servlet/ServletResponseWrapper.html" title="class in javax.servlet"><CODE>ServletResponseWrapper</CODE></A> classes that wrap them.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>request</CODE> - a <A HREF="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet"><CODE>ServletRequest</CODE></A> object 					that contains the client's request<DD><CODE>response</CODE> - a <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet"><CODE>ServletResponse</CODE></A> object  					that contains the servlet's response<DT><B>Throws:</B><DD><CODE><A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A></CODE> - if the included resource throws this exception<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if the included resource throws this exception</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">  <TR ALIGN="center" VALIGN="top">  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>  </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Ent. 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