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(Java) Delete Local Files that Do Not Exist on the FTP Server

Demonstrates how to get a list of local files in a directory tree that do not exist on the FTP server.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

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("login");
    ftp.put_Password("password");

    ftp.put_KeepSessionLog(true);

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

    // Set the current remote directory to the root of
    // the remote tree to be compared.
    success = ftp.ChangeRemoteDir("abc123");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // Recursively descend the local directory tree
    // and find the files that exist locally but not remotely.
    // These are the files what would be uploaded via
    // the SyncRemoteTree method call with mode = 1.
    // (Mode 1 would upload all files that do not exist on the FTP server.)

    // The actual uploading is avoided by setting the preview-only argument to true.
    int mode = 1;
    boolean descendTree = true;
    boolean previewOnly = true;
    success = ftp.SyncRemoteTree2("/temp/abc123",mode,descendTree,previewOnly);
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // The files what would've been uploaded are now available in the SyncPreview property,
    // which contains a list of local file paths, one per line.
    // A program can iterate over them like this:
    CkStringArray sa = new CkStringArray();
    sa.LoadFromText(ftp.syncPreview());

    CkFileAccess fac = new CkFileAccess();

    int numFiles = sa.get_Count();
    int i = 0;
    String localFilePath;
    while ((i < numFiles)) {
        localFilePath = sa.getString(i);
        System.out.println(localFilePath);

        // An application can delete the file using Chilkat's file access object,
        // or it can choose to use the native file API available in the programming language:
        success = fac.FileDelete(localFilePath);
        if (success != true) {
            System.out.println("Failed to delete: " + localFilePath);
            }

        i = i+1;
        }

    success = ftp.Disconnect();
  }
}

 

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