there is two ways to upload/download files from ocsg.

1. java API usage:

   Configuration conf = TableConfigruation.getConf();
   OutputStream out = ...;
   Download download = DownloadFactory.getDownload(conf, path);
   download.write(out);
   download.close();
   out.close();
   

   InputStream in = ...;
   Upload upload = UploadFactory.getInstance(fileSize, THRESTHOLD);
   String returnPath = upload.upload(conf, in, fileName, fileSize);
   in.close();
   

2. java HTTP Client usage:

   Client client = new Client();
   client.upload(uploadUrl, in, fileLength, fileName);
   in.close();
   

   DownloadResponse response = client.download(downloadUrl, filePath);
   InputStream in = response.getInputStream();