?? httpservlet.java
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// HttpServlet - the HTTP servlet class
//
// API based on documentation from JavaSoft.
//
// Copyright (C) 1996,1998 by Jef Poskanzer <jef@acme.com>. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/
package Acme.Serve.servlet.http;
import java.io.*;
import Acme.Serve.servlet.*;
/// The HTTP servlet class.
// <P>
// HttpServlets are little Java programs that can be hooked into an HTTP
// server and run in response to URLs.
// <P>
// This is taken from JavaSoft's Servlet API documentation.
// <P>
// <A HREF="/resources/classes/Acme/Serve/servlet/http/HttpServlet.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
// <P>
// @see Acme.Serve.SampleServlet
// @see Acme.Serve.Serve
public abstract class HttpServlet extends GenericServlet implements Serializable
{
/// Services a single HTTP request from the client.
// @param req the HTTP request
// @param req the HTTP response
// @exception ServletException when a Servlet exception has occurred
// @exception IOException when an I/O exception has occurred
public abstract void service( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException;
/// Services a single generic request from the client.
// (This is required by the peculiar inheritance structure.)
// @param req the servlet request
// @param req the servlet response
// @exception ServletException when a Servlet exception has occurred
// @exception IOException when an I/O exception has occurred
public void service( ServletRequest req, ServletResponse res ) throws ServletException, IOException
{
try
{
service( (HttpServletRequest) req, (HttpServletResponse) res );
}
catch ( ClassCastException e )
{
throw new ServletException( "not an HTTP request" );
}
}
}
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