Java

File Existence Check

See more FTP Examples

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes. 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;

    // 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("username");
    ftp.put_Password("password");

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

    // Set the current remote directory to where the file is located:
    success = ftp.ChangeRemoteDir("something");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // Test to see if the file exists by getting the file size by name. 
    // If a -1 is returned, the file does not exist.
    int fileSize = ftp.GetSizeByName("test123.txt");
    if (fileSize < 0) {
        System.out.println("file does not exist");
        }
    else {
        System.out.println("file exists and is " + fileSize + " bytes in size");
        }

    success = ftp.Disconnect();
  }
}