Java

Set an FTP Compatibility Option

Demonstrates the Chilkat Ftp2.SetOption method, which enables or disables a named compatibility option. The only argument is the option name; matching is case-insensitive, and prefixing a recognized name with No- disables it.

Background: Real-world FTP servers have quirks, and these named options are targeted workarounds for specific ones — for example Microsoft-TLS-1.2-Workaround addresses a known interoperability issue. Most applications never need any of them; reach for SetOption only when a documented server problem calls for a specific fix, and use the exact recognized name.

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Java

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[])
  {
    boolean success = false;

    //  Demonstrates the Ftp2.SetOption method, which enables or disables a named compatibility option.
    //  The only argument is the option name.  Prefix a name with "No-" to disable it.

    CkFtp2 ftp = new CkFtp2();

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("myFtpLogin");

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    ftp.put_Password("myPassword");

    success = ftp.Connect();
    if (success == false) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    //  Enable a recognized compatibility workaround.  Option-name matching is case-insensitive.
    success = ftp.SetOption("Microsoft-TLS-1.2-Workaround");
    if (success == false) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    //  To disable it, prefix the name with "No-":
    success = ftp.SetOption("No-Microsoft-TLS-1.2-Workaround");
    if (success == false) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    System.out.println("Compatibility option toggled.");

    success = ftp.Disconnect();
    if (success == false) {
        System.out.println(ftp.lastErrorText());
        return;
        }
  }
}