imageservlet.java

tomcat最新安装程序

/*
 * ============================================================================
 *                   The JasperReports License, Version 1.0
 * ============================================================================
 * 
 * Copyright (C) 2001-2003 Teodor Danciu ([e-mail]). 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.
 * 
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment: "This product includes software
 *    developed by Teodor Danciu (http://jasperreports.sourceforge.net)."
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The name "JasperReports" must not be used to endorse or promote products 
 *    derived from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 * 
 * 5. Products derived from this software may not be called "JasperReports", nor 
 *    may "JasperReports" appear in their name, without prior written permission
 *    of Teodor Danciu.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
 * APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
 * DING, 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.
 */

/*
 * ============================================================================
 *                   GNU Lesser General Public License
 * ============================================================================
 *
 * JasperReports - Free Java report-generating library.
 * Copyright (C) 2001-2003 Teodor Danciu [e-mail]
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 * Teodor Danciu
 * 173, Calea Calarasilor, Bl. 42, Sc. 1, Ap. 18
 * Postal code 741181, Sector 3
 * Bucharest, ROMANIA
 * Email: [e-mail]
 */
package servlets;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;


/**
 *
 */
public class ImageServlet extends HttpServlet
{


	/**
	 *
	 */
	public void service(
		HttpServletRequest request,
		HttpServletResponse response
		) throws IOException, ServletException
	{
		Map imagesMap = (Map)request.getSession().getAttribute("IMAGES_MAP");
	
		if (imagesMap != null)
		{
			String imageName = request.getParameter("image");
			if (imageName != null)
			{
				byte[] imageData = (byte[])imagesMap.get(imageName);
	
				response.setContentLength(imageData.length);
				ServletOutputStream ouputStream = response.getOutputStream();
				ouputStream.write(imageData, 0, imageData.length);
				ouputStream.flush();
				ouputStream.close();
			}
		}
	}


}