base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/DownloadFsFileService.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.specific;
  17
  18 import java.io.File;
  19 import java.io.IOException;
  20
  21 import javax.servlet.ServletException;
  22 import javax.servlet.http.HttpServletRequest;
  23 import javax.servlet.http.HttpServletResponse;
  24
  25 import org.apache.commons.io.FileUtils;
  26 import org.argeo.ArgeoException;
  27 import org.eclipse.rap.rwt.service.ServiceHandler;
  28
  29 /**
  30  * Basic service handler that retrieves a file in the server file system using
  31  * an absolute path and forward it to the end user browser. Rap specific.
  32  */
  33 public class DownloadFsFileService implements ServiceHandler {
  34         public final static String PARAM_FILE_NAME = "param.fileName";
  35         public final static String PARAM_FILE_PATH = "param.filePath";
  36
  37         public DownloadFsFileService() {
  38         }
  39
  40         public void service(HttpServletRequest request, HttpServletResponse response)
  41                         throws IOException, ServletException {
  42                 String fileName = request.getParameter(PARAM_FILE_NAME);
  43                 String path = request.getParameter(PARAM_FILE_PATH);
  44
  45                 // Get the file
  46                 File file = new File(path);
  47
  48                 // Send the Metadata
  49                 response.setContentType("application/octet-stream");
  50                 response.setContentLength((int) file.length());
  51                 String contentDisposition = "attachment; filename=\"" + fileName + "\"";
  52                 response.setHeader("Content-Disposition", contentDisposition);
  53
  54                 try {
  55                         response.getOutputStream().write(
  56                                         FileUtils.readFileToByteArray(new File(path)));
  57                 } catch (IOException ioe) {
  58                         throw new ArgeoException("Error while writing the file " + fileName
  59                                         + " to the servlet response", ioe);
  60                 }
  61         }
  62 }