📄 requestdispatcher.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_14) on Mon Jan 28 05:47:06 PST 2008 --><TITLE>RequestDispatcher (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.servlet.RequestDispatcher interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="RequestDispatcher (Java EE 5)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_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> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javax/servlet/GenericServlet.html" title="class in javax.servlet"><B>PREV CLASS</B></A> <A HREF="../../javax/servlet/Servlet.html" title="interface in javax.servlet"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javax/servlet/RequestDispatcher.html" target="_top"><B>FRAMES</B></A> <A HREF="RequestDispatcher.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.servlet</FONT><BR>Interface RequestDispatcher</H2><HR><DL><DT><PRE>public interface <B>RequestDispatcher</B></DL></PRE><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.<P><P><DL><DT><B>Author:</B></DT> <DD>Various</DD><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><HR><P><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><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" title="interface in javax.servlet">ServletRequest</A> request, <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A> response)</CODE><BR> Forwards a request from a servlet to another resource (servlet, JSP file, or HTML file) on the server.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><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" title="interface in javax.servlet">ServletRequest</A> request, <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A> response)</CODE><BR> Includes the content of a resource (servlet, JSP page, HTML file) in the response.</TD></TR></TABLE> <P><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)"><!-- --></A><H3>forward</H3><PRE>void <B>forward</B>(<A HREF="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</A> request, <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A> response) throws <A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A>, <A HREF="http://java.sun.com/j2se/1.5/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/1.5/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/1.5/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>void <B>include</B>(<A HREF="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</A> request, <A HREF="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</A> response) throws <A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A>, <A HREF="http://java.sun.com/j2se/1.5/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/1.5/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=2 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> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javax/servlet/GenericServlet.html" title="class in javax.servlet"><B>PREV CLASS</B></A> <A HREF="../../javax/servlet/Servlet.html" title="interface in javax.servlet"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javax/servlet/RequestDispatcher.html" target="_top"><B>FRAMES</B></A> <A HREF="RequestDispatcher.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_bottom"></A><!-- ======== END OF BOTTOM NAVBAR ======= --><HR><font size="-1"><a href="http://java.sun.com/webapps/bugreport">Submit a bug or feature</a> <p>Copyright 2007 Sun Microsystems, Inc. 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