BlobStoreFiles

gistfile1.txt

  public void doPost(HttpServletRequest req, HttpServletResponse res)
      throws ServletException, IOException {
    PrintWriter out = res.getWriter();
    out.print("uploading files");
    
    FileService fileService = FileServiceFactory.getFileService();

    try {
      ServletFileUpload upload = new ServletFileUpload();
      res.setContentType("text/plain");
      
      FileItemIterator iterator = upload.getItemIterator(req);
      
      while (iterator.hasNext()) {
        FileItemStream item = iterator.next();
        
        if (!item.isFormField()) {
          boolean lock = false;
          InputStream stream = item.openStream();
          out.print(item.getName());
          
          AppEngineFile file = fileService.createNewBlobFile("image/png");
          
          lock = true;
          FileWriteChannel writeChannel = fileService.openWriteChannel(file, lock);
          
          ByteBuffer content = ByteBuffer.wrap(IOUtils.toByteArray(stream));
          IOUtils.closeQuietly(stream);
          
          writeChannel.write(content);
          writeChannel.closeFinally();
          lock = false;
          
          BlobKey blobKey = fileService.getBlobKey(file);
          
          if (blobKey == null) {
            out.print("error while uploading");
          }          
        }
      }
    } catch (FileUploadException e) {
      e.printStackTrace();
    }
  }