Need help adding FTP functionality

Question

Is there a built in class for FTP functionality with the jdk 1.5
I am sure there are thousands of threads on this subject but when I searched for related threads the first ten pages were all about ftp errors.
we are manually FTPing files from several remote servers to one main server, then using java to further act on these files.
I know there is a way to program java to FTP the files automatically.
Does anyone know a link to a good related thread?
Does anyone know where to find some free code to do this. I can't pay the $ for the commercial packages out there. I would like to code my own client but do not know where to begin.
Anybody?

Answer 1

Here's a little demo I have lying around:
import org.apache.commons.net.ftp.*;
* Download Jakarta's net-jar:
* http://jakarta.apache.org/site/downloads/downloads_commons-net.cgi
public class FTPDemo {
    private boolean isConnected = false;
    private FTPClient client;
    public FTPDemo() {
        connect();
        listFiles();
        disconnect();
    private void connect() {
        String server = "ftp.yoursite.org";
        String username = "yourlogin";
        String password = "yourpassword";
        client = new FTPClient();
        try {
            client.connect(server);
            client.login(username, password);
            isConnected = true;
        } catch (Exception e) {
            e.printStackTrace();
            isConnected = false;
    private void disconnect() {
        if(isConnected) {
            try {
                client.disconnect();
            } catch(Exception e) {
                e.printStackTrace();
            isConnected = false;
    private void listFiles() {
        if(!isConnected) return;
        try {
            String[] files = client.listNames();
            for(int i = 0; i < files.length; i++) {
                System.out.println(files);
isConnected = true;
} catch(Exception e) {
e.printStackTrace();
isConnected = false;
public static void main(String[] args) {
new FTPDemo();