Directory Existence Check

How to test if a directory exists on an FTP server.

A good way to check to see if a directory already exists is to try to "cd" to that remote directory by calling ChangeRemoteDir. If it succeeds, then the directory exists. If not, then it does not exist. An alternative method is to set the ListPattern = "*" and then iterate over the files/directories, looking for the directory.

Download Chilkat Java Library

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.chilkatsoft.com");
    ftp.put_Username("***");
    ftp.put_Password("***");

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

    //  Does the "temp" directory exist?
    boolean dirExists;
    dirExists = ftp.ChangeRemoteDir("/temp");
    if (dirExists == true) {
        System.out.println("Yes, the temp directory exists.");
        //   Yes, it exists. Restore the current remote dir:
        success = ftp.ChangeRemoteDir("..");
        if (success != true) {
            System.out.println(ftp.lastErrorText());
            return;
        }

    }

    //  Alternatively, you may set the ListPattern = "*" and
    //   look for the directory:
    ftp.put_ListPattern("*");

    int i;
    int n;
    n = (int) ftp.get_NumFilesAndDirs();
    if (n < 0) {
        //  Failed to get directory listing based on ListPattern
        System.out.println(ftp.lastErrorText());
        return;
    }

    boolean foundDir;
    foundDir = false;
    if (n > 0) {
        for (i = 0; i <= n - 1; i++) {
            boolean isDir;
            isDir = ftp.GetIsDirectory(i);
            if (isDir == true) {
                String fname;
                fname = ftp.getFilename(i);
                if (fname == "temp") {
                    System.out.println("Found temp directory!");
                    foundDir = true;
                    break;
                }

            }

        }

    }

    if (foundDir != true) {
        System.out.println("temp directory not found!");
    }

    ftp.Disconnect();
  }
}