ImageAction.java

/*
 * $Id: ImageAction.java 471754 2006-11-06 14:55:09Z husted $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */


package org.apache.struts.webapp.exercise;


import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


/**
 * Read image from resource given as ActionMapping parameter
 * and copy to output stream.
 *
 * @version $Rev: 471754 $ $Date: 2006-11-06 15:55:09 +0100 (Mon, 06 Nov 2006) $
 */

public class ImageAction extends Action {


    /**
     * Read image from resource given as ActionMapping parameter
     * and copy to output stream.
     *
     * @exception java.lang.Exception on input/output error
     */
    public ActionForward execute(
            ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
            throws Exception {

            // e.g. /$module/struts-power.gif
            // :FIXME: Should compute module
        String image = mapping.getParameter();

        byte[] buffer = new byte[2048];
        int bytesRead;
        InputStream input =
                getServlet().getServletContext().getResourceAsStream(image);
        OutputStream
                out = response.getOutputStream();

        while ((bytesRead = input.read(buffer)) != -1) {
            out.write(buffer, 0, bytesRead);
        }
        out.close();

        return null;
    }

}