Как загрузить на Ftp сервер список файлов?

@Override
    protected Void doInBackground(Void... voids){
        FTPClient client = new FTPClient();
        FileInputStream fis = null;
        OutputStream outputStream;
        byte[] buffer = new byte[BUFFER_SIZE];
        int totalBytesRead = 0;
        try {
            client.connect(host,port);
            client.login(username, password);
            client.setFileType(FTP.BINARY_FILE_TYPE);
            for (File file : uploadFile){
                fis = new FileInputStream(file);
                outputStream = client.storeFileStream(file.getName());
                int bytesRead;
                while ((bytesRead = fis.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                    totalBytesRead += bytesRead;
                    int percentCompleted = (totalBytesRead * 100 / length);
                    Log.d("PROGRESS", String.valueOf(totalBytesRead)+"  "+String.valueOf(percentCompleted));
                    onProgressUpdate(totalBytesRead);
                }
            }
            client.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null) {
                    fis.close();
                }
                client.disconnect();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }