(Java) FTP Non-Recursive Sync Directory (Download)

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Download files from the server that have filenames matchhing a pattern, and don't yet exist in a local directory.

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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[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkFtp2 ftp = new CkFtp2();

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("myUsername");
    ftp.put_Password("myPassword");
    ftp.put_Port(21);
    ftp.put_AuthTls(true);

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

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

    // Indicate that we only want to download files with filenames ending in ".txt"
    ftp.put_SyncMustMatch("*.txt");

    // Modes for synchronization are as follows:
    // mode=0: Download all files
    // mode=1: Download all files that do not exist on the local filesystem.
    // mode=2: Download newer or non-existant files.
    // mode=3: Download only newer files. If a file does not already exist on the local filesystem, it is not downloaded from the server.
    // mode=5: Download only missing files or files with size differences.
    // mode=6: Same as mode 5, but also download newer files.
    // mode=99: Do not download files, but instead delete remote files that do not exist locally.
    int mode = 1;

    // Download all files matching "*.txt" from the current remote ftp directory.
    // The files are downloaded into c:/temp/qa_output
    success = ftp.SyncLocalDir("c:/temp/qa_output",mode);
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // We can see what files were downloaded in the SyncedFiles property,
    // which lists the files one per line.
    System.out.println(ftp.syncedFiles());

    // Perhaps we wish to delete the files we just downloaded from the server..
    CkStringBuilder sb = new CkStringBuilder();
    sb.Append(ftp.syncedFiles());

    CkStringTable st = new CkStringTable();
    st.AppendFromSb(sb);

    int numFiles = st.get_Count();
    int i = 0;
    String remoteFilename;
    while (i < numFiles) {
        remoteFilename = st.stringAt(i);
        System.out.println("Deleting " + remoteFilename + " from the FTP server");
        success = ftp.DeleteRemoteFile(remoteFilename);
        if (success != true) {
            System.out.println(ftp.lastErrorText());
            return;
            }

        i = i+1;
        }

    success = ftp.Disconnect();
  }
}