base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/FileDownloadServiceHandler.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 /** Provide a basic handler that returns a file from the file system in Rap. */
  30 public class FileDownloadServiceHandler implements ServiceHandler {
  31         private final String downloadServicehandlerId;
  32         public final static String PARAM_FILE_NAME = "param.fileName";
  33         public final static String PARAM_FILE_PATH = "param.filePath";
  34
  35         public FileDownloadServiceHandler(String downloadServicehandlerId) {
  36                 this.downloadServicehandlerId = downloadServicehandlerId;
  37         }
  38
  39         public void service(HttpServletRequest request, HttpServletResponse response)
  40                         throws IOException, ServletException {
  41                 String fileName = request.getParameter(PARAM_FILE_NAME);
  42                 String path = request.getParameter(PARAM_FILE_PATH);
  43
  44                 // Get the file
  45                 File file = new File(path);
  46
  47                 // Send the Metadata
  48                 response.setContentType("application/octet-stream");
  49                 response.setContentLength((int) file.length());
  50                 String contentDisposition = "attachment; filename=\"" + fileName + "\"";
  51                 response.setHeader("Content-Disposition", contentDisposition);
  52
  53                 try {
  54                         response.getOutputStream().write(
  55                                         FileUtils.readFileToByteArray(new File(path)));
  56                 } catch (IOException ioe) {
  57                         throw new ArgeoException("Error while writing the file " + fileName
  58                                         + " to the servlet response", ioe);
  59                 }
  60         }
  61
  62         public String getDownloadServiceHandlerId(){
  63                 return downloadServicehandlerId;
  64         }
  65 }