Java

FTP Automatic Post-Connect Commands

Demonstrates the AutoFeat, AutoSyst, AutoOptsUtf8, and AutoXcrc properties, which control commands Chilkat issues automatically around connecting and transferring.

Background: Chilkat normally probes and adapts to a server on its own: AutoFeat discovers capabilities with FEAT, AutoSyst learns the OS type to parse legacy listings, and AutoOptsUtf8 enables UTF-8 filenames when the server advertises it. These are on by default and rarely worth changing. AutoXcrc is the exception worth enabling deliberately — it verifies each upload with the server's XCRC checksum, catching corruption automatically where supported.

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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Ftp2;

public class ChilkatExample {

    public static void main(String[] args) {
        Ftp2 ftp = new Ftp2();

        ftp.setHostname("ftp.example.com");
        ftp.setUsername("myFtpLogin");

        // These auto-* properties control commands Chilkat sends automatically after connecting.  They
        // are on/off by default as noted, and are rarely changed.

        // AutoFeat (default true): automatically send FEAT to discover server capabilities.
        ftp.setAutoFeat(true);

        // AutoSyst (default true): automatically send SYST after login to learn the server OS type.
        ftp.setAutoSyst(true);

        // AutoOptsUtf8 (default true): send OPTS UTF8 ON when the FEAT response advertises UTF8.
        ftp.setAutoOptsUtf8(true);

        // AutoXcrc (default false): request an XCRC checksum after each upload and treat a mismatch as
        // a failure, giving automatic post-upload verification where the server supports XCRC.
        ftp.setAutoXcrc(true);

        // 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.setPassword("myPassword");

        try {
            ftp.connect();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Connected with the configured automatic features.");

        try {
            ftp.disconnect();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }
    }
}