SOCKS4 and SOCKS5 Proxy for FTP

Demonstrates how to connect to an FTP server through a SOCKS4 or SOCKS5 proxy. Both SSL/TLS and non-secure FTP communications may use SOCKS4 and SOCKS5 proxies.

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkFtp2 ftp = new CkFtp2();

    boolean success;

    //  Any string unlocks the component for the 1st 30-days.
    success = ftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }

    ftp.put_Hostname("ftp.example-code.com");
    ftp.put_Username("myLogin");
    ftp.put_Password("myPassword");

    //  To use a SOCKS4 or SOCKS5 proxy, simply set the following
    //  properties prior to connecting:
    //  The SOCKS hostname may be a domain name or
    //  IP address:
    ftp.put_SocksHostname("www.mysocksproxyserver.com");
    ftp.put_SocksPort(1080);
    ftp.put_SocksUsername("myProxyLogin");
    ftp.put_SocksPassword("myProxyPassword");
    //  Set the SOCKS version to 4 or 5 based on the version
    //  of the SOCKS proxy server:
    ftp.put_SocksVersion(5);
    //  Note: SOCKS4 servers only support usernames without passwords.
    //  SOCKS5 servers support full login/password authentication.

    //  Connect and login to the FTP server.
    success = ftp.Connect();
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }

    //  Change to the remote directory where the file is located.
    //  This step is only necessary if the file is not in the root directory
    //  for the FTP account.
    success = ftp.ChangeRemoteDir("junk");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }

    //  Download a file.
    String localFilename;
    localFilename = "c:/temp/hamlet.xml";
    String remoteFilename;
    remoteFilename = "hamlet.xml";

    success = ftp.GetFile(remoteFilename,localFilename);
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }

    ftp.Disconnect();

    System.out.println("File Downloaded!");
  }
}