問題描述
Apache Commons Net 庫似乎沒有向任何記錄器"發(fā)送任何內(nèi)容.
Apache Commons Net library does not seem to send anything to any "logger".
我能否以某種方式從 (FTP) 會話中獲取日志文件以進(jìn)行調(diào)試?例如來自服務(wù)器的原始 FTP 命令和響應(yīng)，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
推薦答案
Apache Commons Net 中的所有協(xié)議實現(xiàn)，包括 FTPClient，都派生自 SocketClient，它有一個方法<代碼>addProtocolCommandListener.您可以將 ProtocolCommandListener 實現(xiàn)日志記錄.
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.
有一個現(xiàn)成的實現(xiàn) PrintCommandListener，將協(xié)議日志打印到提供的PrintStream.
使用這樣的代碼:
ftpClient.addProtocolCommandListener(
new PrintCommandListener(
new PrintWriter(new OutputStreamWriter(System.out, "UTF-8")), true));
...，您將得到您所要求的準(zhǔn)確輸出.
..., you will get exactly the output that you have asked for.
這篇關(guān)于在 Apache Commons Net 中為 FTP 協(xié)議啟用日志記錄的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！