import java.io.IOException;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;


public class FTP {

    static void listDirectory(FTPClient ftpClient, String parentDir,
            String currentDir, int level) throws IOException {
        //String dirToList = parentDir;
       // if (!currentDir.equals("")) {
         //   dirToList += "/" + currentDir;
       // }
        FTPFile[] subFiles = null;
     //   ftpClient.listFiles(parentDir);
      try {
        subFiles = ftpClient.listFiles(parentDir);
      }catch(Exception ex){
          ex.printStackTrace();
      }


        if (subFiles != null && subFiles.length > 0) {
            for (FTPFile aFile : subFiles) {
                String currentFileName = aFile.getName();
                if (currentFileName.equals(".")
                        || currentFileName.equals("..")) {
                    // skip parent directory and directory itself
                    continue;
                }
                for (int i = 0; i < level; i++) {
                    System.out.print("t");
                }
                if (aFile.isDirectory()) {
                    System.out.println("[" + currentFileName + "]");
                    listDirectory(ftpClient, parentDir, currentFileName, level + 1);
                } else {
                    System.out.println(currentFileName);
                }
            }
        }
    }
    public static void main(String[] args) {
        String server = "10.xxx.xx.xxx"; // ftp server address
        int port = 21; // ftp uses default port Number 21
        String user = "123$ftp";// username of ftp server
        String pass = "123$ftp"; // password of ftp server
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(server, port);
            ftpClient.login(user, pass);
            int replyCode = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(replyCode)) {
                System.out.println("Connect failed");
                return;
            }
            boolean success = ftpClient.login(user, pass);
            if (success) {
                System.out.println("Could not login to the server");
                return;
            }
            String dirToList = "TMS$SYSDEVICE:[TMS$VMS.OPERATOR.PRINT]";
            listDirectory(ftpClient, dirToList, "", 1);
        } catch (IOException ex) {
            System.out.println("Oops! Something wrong happened");
            ex.printStackTrace();
        }catch(Exception ex){
              System.out.println("Oops! Something wrong happened");
                ex.printStackTrace();
            }
        finally {
            // logs out and disconnects from server
            try {
                if (ftpClient.isConnected()) {
                    ftpClient.logout();
                    ftpClient.disconnect();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}