使用Java连接到FTP

Question

I would like to connect to a FTP from Java.

I have done this: When the socket is connected to the FTP I get the 220 message from the socket´s inputstream (the welcome message from the FTP server).

Then I send this byte string through the sockets outputstream: "HELP".

But nothing is received from the server after sending that byte string. The inputstream is still listening but it is totaly quiet.

Have I missed something important?

Answer 1

There's no need to reinvent the wheel. Instead, I would recommend using Apache's org.apache.commons.net.ftp.FTPClient . For more information, see Apache Commons Net .

Answer 2

您需要在发送命令的末尾发送CR / LF线路终结器，例如

HELP\r\n