how to improve transfering file's efficiency

I have write program for client to client file transmission
but it seems unefficient ,the transmission speed is low
and it take too much CPU resource

here are the codes(sender's and receiver's)
are there some ways to improve it about the transfer speed and cup?

sender's code:
-------------------------------------------------------
      input_file = new BufferedInputStream(new FileInputStream(file));
      output_file = new
BufferedOutputStream(socket_file.getOutputStream());

      byte[] buffer = new byte[10240];
      int readed;
      while ( (readed = input_file.read(buffer)) != -1) {
        output_file.write(buffer, 0, readed);
      }

      output_file.flush();
-------------------------------------------------------

receiver's code:
-------------------------------------------------------
      output_file = new BufferedOutputStream(new
FileOutputStream(file));
      input_file = new
BufferedInputStream(socket_file.getInputStream());

      byte[] buffer = new byte[10240];
      int readed;
      while ( (readed = input_file.read(buffer)) != -1) {
        output_file.write(buffer, 0, readed);
      }

      output_file.flush();
-------------------------------------------------------

Thank you very much in advance