ImageAction xref

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    1   /*
    2    * $Id: ImageAction.java 471754 2006-11-06 14:55:09Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21
    22
    23  package org.apache.struts.webapp.exercise;
    24
    25
    26  import org.apache.struts.action.Action;
    27  import org.apache.struts.action.ActionForm;
    28  import org.apache.struts.action.ActionForward;
    29  import org.apache.struts.action.ActionMapping;
    30
    31  import javax.servlet.http.HttpServletRequest;
    32  import javax.servlet.http.HttpServletResponse;
    33  import java.io.InputStream;
    34  import java.io.OutputStream;
    35
    36
    37  /**
    38   * Read image from resource given as ActionMapping parameter
    39   * and copy to output stream.
    40   *
    41   * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
    42   */
    43
    44  public class ImageAction extends Action {
    45
    46
    47      /**
    48       * Read image from resource given as ActionMapping parameter
    49       * and copy to output stream.
    50       *
    51       * @exception java.lang.Exception on input/output error
    52       */
    53      public ActionForward execute(
    54              ActionMapping mapping,
    55              ActionForm form,
    56              HttpServletRequest request,
    57              HttpServletResponse response)
    58              throws Exception {
    59
    60              // e.g. /$module/struts-power.gif
    61              // :FIXME: Should compute module
    62          String image = mapping.getParameter();
    63
    64          byte[] buffer = new byte[2048];
    65          int bytesRead;
    66          InputStream input =
    67                  getServlet().getServletContext().getResourceAsStream(image);
    68          OutputStream
    69                  out = response.getOutputStream();
    70
    71          while ((bytesRead = input.read(buffer)) != -1) {
    72              out.write(buffer, 0, bytesRead);
    73          }
    74          out.close();
    75
    76          return null;
    77      }
    78
    79  }