在 Apache Commons Net 中为 FTP 协议启用日志记录

问题描述

Apache Commons Net 库似乎没有向任何记录器"发送任何内容.

Apache Commons Net library does not seem to send anything to any "logger".

我能否以某种方式从 (FTP) 会话中获取日志文件以进行调试?例如来自服务器的原始 FTP 命令和响应，如下所示:

Can I somehow obtain a log file from an (FTP) session, for debugging purposes? For example raw FTP commands and responses from the server, like this:

220 Welcome
USER *******
331 Password required for ...
PASS *******
230 Logged on
TYPE I
200 Type set to I
QUIT
221 Goodbye

推荐答案

Apache Commons Net 中的所有协议实现，包括 FTPClient，都派生自 SocketClient，它有一个方法<代码>addProtocolCommandListener.您可以将 ProtocolCommandListener 实现日志记录.

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.

有一个现成的实现 PrintCommandListener，将协议日志打印到提供的PrintStream.

使用这样的代码:

ftpClient.addProtocolCommandListener(
    new PrintCommandListener(
        new PrintWriter(new OutputStreamWriter(System.out, "UTF-8")), true));

...，您将得到您所要求的准确输出.

..., you will get exactly the output that you have asked for.

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