問題描述
在使用 URLConnection 類時是否可以設置 FTP 被動或主動模式?我找不到任何關于此的文檔，但這是一個非常基本的功能，很難相信它沒有實現.
Is it possible to set FTP passive or active mode when working with URLConnection class? I cannot find any documentation on this, yet this is such a basic functionality that it's hard to believe it is not implemented.
如果不是，我在標準 Java 中還有哪些其他選擇?
If it's not, what other options do I have in standard Java?
推薦答案
要讓 FTP 完全正常工作，你真的需要使用 套接字.URLConnection 和 consorts 根本不適合您的需要(不支持進入被動模式).幸運的是，Apache Commons 已經為您完成了許多類似 Apache Commons Net FTPClient 的工作.要實現您的需要，只需使用 FTPClient#enterLocalPassiveMode() 或 FTPClient#enterLocalActiveMode()
To get FTP full fledged to work, you'll really need to fall back to low-level programming with Sockets. The URLConnection and consorts simply doesn't suit your needs (no support to enter into passive mode). Fortunately Apache Commons has already done a lot of work for you in flavor of Apache Commons Net FTPClient. To achieve what you need, just use FTPClient#enterLocalPassiveMode() or FTPClient#enterLocalActiveMode()
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