Problem Opening a Page!

Question

Hello,
I seem to be having a problem with an FTP Upload program. Its very simple and pointless but im trying to learn how to make one.
The problem is, I have users who input data in a textfield (Yes its a Swing application). And when they input all data they click the "Connect" button. Unfortunatly, when a user inputs the data and presses Connect, nothing happens. Perhaps someone can take a look at the source codes and explain to me why im getting the problem and how to solve it? :)
It would be greatly appreciated, thank you!
http://www.projectevolution.comoj.com/ftpuploadsc.html
(Copy and paste it and place in Wordpad so its readable)
*~ Project Evolution*

Answer 1

public void upload() throws MalformedURLException, IOException
    String ftpServer = ftpUserServer.getText();
    String ftpUser = ftpUsername.getText();
    String ftpPassword = ftpPass.getText();
    String ftpFileName = ftpFile.getText();
    File ftpSource = new File (ftpSourceDownload.getText());
    // if the server, username and password arent null, execute...
    if (ftpServer != null && ftpFileName != null && ftpSource != null) {
    StringBuffer sb = new StringBuffer("ftp://"); // begins the StringBuilder...
    // with "ftp://", then adds 16 empty elements
    if (ftpUser != null && ftpPassword != null) {
    sb.append(ftpUser); // appends the username
    sb.append(':'); // appends : to seperate username from pass
    sb.append(ftpPassword); // appends password
    sb.append('@'); // seperates password from host
    sb.append(ftpServer); // FTP server address
    sb.append('/'); // seperates with a /
    sb.append(ftpFileName); // filename. example: Directory/file.txt
    sb.append(";type=a"); // appends, also includes upload in ASCII mode
    BufferedInputStream bufferis = null; // sets input stream to nothing
    BufferedOutputStream bufferos = null; // sets output stream to nothing
    try {
        System.out.println("Connection Successful!");
    URL url = new URL(sb.toString()); // converts all sb.append names to a string
    URLConnection urlcon = url.openConnection(); // connects to the URL using the openConnection method
    bufferos = new BufferedOutputStream(urlcon.getOutputStream());
    bufferis = new BufferedInputStream(new FileInputStream(ftpSource));
    int i;
    // read byte by byte until end of stream
    while ((i = bufferis.read()) != -1)
    bufferos.write(i);
    finally
    if (bufferis != null)
    try
    bufferis.close();
    catch (IOException ioe)
    ioe.printStackTrace();
    if (bufferos != null)
    try
    bufferos.close();
    catch (IOException ioe)
    ioe.printStackTrace();
    else
    System.out.println("Input not available.");
    }