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Editorial Team
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Asked: 2026-05-12T05:08:18+00:00

I want to set up an FTP connection using a proxy server with Apache’s

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I want to set up an FTP connection using a proxy server with Apache’s commons-net.

But looking at this Does FTPClient support FTP connections through an FTP proxy server? has me worried.

I have to meddle with the system properties and the Sun docs state that “If socksProxyHost is specified then all TCP sockets will use the SOCKS proxy server to establish a connection or accept one.”
WTH? All TCP sockets? What about my database connections? Or other FTP connections i might want to open at the same time not using a proxy? Will they all be affected?

Is there some other way to do it that doesn’t mess with the rest of my application?

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1 Answer

  1. Editorial Team

    You have several ways of using proxies in Java, especially from version 1.5.

    1. Using System Properties: quick & powerfull but limited flexibility
      • You can use use a SOCKS proxy for all TCP connections.
      • You can also set a proxy per protocol, doable for HTTP, FTP and HTTPS
      • For both methods, you can specify a list of hosts that will not use proxy
    2. Using the java.net.Proxy class (Java 1.5+) to set (or not) a Proxy per Connection
    3. Impleting a java.net.ProxySelector (idem) which will determine a Proxy for each Connection according to your criteria

    See the detailled Sun technote on networking & proxies.

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