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

   1 package org.argeo.eclipse.ui.specific;
   2
   3 import java.io.IOException;
   4
   5 import javax.servlet.ServletException;
   6 import javax.servlet.http.HttpServletResponse;
   7
   8 import org.argeo.ArgeoException;
   9 import org.eclipse.rwt.RWT;
  10 import org.eclipse.rwt.service.IServiceHandler;
  11
  12 public class DownloadServiceHandler implements IServiceHandler {
  13
  14         private FileProvider provider;
  15
  16         public DownloadServiceHandler(FileProvider provider) {
  17                 this.provider = provider;
  18         }
  19
  20         public void service() throws IOException, ServletException {
  21                 // Which file to download?
  22                 String fileName = RWT.getRequest().getParameter("filename");
  23                 String fileId = RWT.getRequest().getParameter("fileid");
  24
  25                 // Get the file content
  26                 byte[] download = provider.getByteArrayFileFromId(fileId);
  27
  28                 // Send the file in the response
  29                 HttpServletResponse response = RWT.getResponse();
  30                 response.setContentType("application/octet-stream");
  31                 response.setContentLength(download.length);
  32                 String contentDisposition = "attachment; filename=\"" + fileName + "\"";
  33                 response.setHeader("Content-Disposition", contentDisposition);
  34
  35                 // Various header fields that can be set to solve some issues with some
  36                 // old browsers.
  37                 // Unused.
  38                 // String contentType = "application/force-download; name=\"" + fileName
  39                 // + "\"";
  40                 // response.setContentType(contentType);
  41                 // response.setHeader("Content-Transfer-Encoding", "binary");
  42                 // response.setHeader("Pragma", "no-cache");
  43                 // response.setHeader("Cache-Control", "no-cache, must-revalidate");
  44                 // response.setHeader("Expires", "0");
  45                 // response.setHeader("Connection", "Keep-Alive");
  46                 // response.setHeader("Keep-Alive", "timeout=5, max=86");
  47                 // response.setHeader("transfer-Encoding", "chunked");
  48
  49                 try {
  50                         response.getOutputStream().write(download);
  51                 } catch (IOException ioe) {
  52                         throw new ArgeoException("Error while writing the file " + fileName
  53                                         + " to the servlet response", ioe);
  54                 }
  55         }
  56 }