Enable logging in Apache Commons Net for FTP protocol
All protocol implementations in Apache Commons Net, including FTPClient, derive from SocketClient, which has a method addProtocolCommandListener. You can pass it an implementation of ProtocolCommandListener to implement logging.
There's a ready-made implementation PrintCommandListener, which prints the protocol log to provided PrintStream.
With a code like this:
ftpClient.addProtocolCommandListener(
new PrintCommandListener(
new PrintWriter(new OutputStreamWriter(System.out, "UTF-8")), true));
..., you will get exactly the output that you have asked for.