Hello all.  I'm building a small FTP file upload applet.  This is just
a very basic applet that allows a user to drag and drop files into a
JTextArea component, then they click a button and it takes the files
one by one and uploads them via FTP.  I have all of this working, but
I've been trying to put a JProgressBar into it to show the status of
the current file being uploaded.  The problem I have is that the
progress bar isn't getting updated until the file is finished getting
uploaded (which causes a jump from 0% to 100% all at once).  Can
someone please help point me in the right direction?  Here is the code
I have so far:

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.Timer;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.dnd.DropTarget;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringTokenizer;

import sun.net.ftp.FtpClient;
import java.io.*;

public class FileUpload extends JApplet {
   public static FileUpload selfRef = null;
   public JProgressBar progressBar = new JProgressBar();
   public JTextArea fileListArea;
   private JSplitPane splitPane;
   private DropTarget dropTargetItem;
   private JButton uploadButton = new JButton("Upload Files");
   private ButtonListener btnList = new ButtonListener();
   private FtpClient ftp;
   private int appletWidth = 300;
   private int appletHeight = 300;
   public int currentFileUpPercent = 0;

   public void init() {
       selfRef = this;
   }

   public void stop() {
   }

   public void destroy() {
   }

   // ActionListener for the "Upload Files" button
   class ButtonListener implements ActionListener {
       public void actionPerformed(ActionEvent e) {
           preUpload();
           String allText = fileListArea.getText();
           StringTokenizer st = new StringTokenizer(allText, "\n");
           if (st.countTokens() > 0) {
               connectToFTP();
               while (st.hasMoreTokens()) {
                   String line = st.nextToken();
                   doUpload(line);
                   System.out.println("FILE: " + line);
               }
               disconnectFTP();
           }
           postUpload();
       }
   }

   public void start() {
       // Set applet size
       setSize(appletWidth, appletHeight);

       // Create new container
       splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
       // splitPane.setOneTouchExpandable(true);

       // Add label
       add(new JLabel("Drag files here to upload..."),
BorderLayout.NORTH);

       // Create file list text box
       fileListArea = new JTextArea();
       fileListArea.setBounds(0, 0, appletWidth, appletHeight);
       fileListArea = new JTextArea();
       fileListArea.setBackground(Color.white);
       fileListArea.setEditable(false);
       add(fileListArea, BorderLayout.CENTER);

       // Progress bar
       progressBar.setValue(0);

       // Upload button
       uploadButton.addActionListener(btnList);
       uploadButton.setEnabled(false);

       // Setup bottom area
       splitPane.setLeftComponent(uploadButton);
       splitPane.setRightComponent(progressBar);
       add(splitPane, BorderLayout.SOUTH);
       splitPane.setDividerSize(0);

       // Set up our text area to recieve drops...
       DropZone dropZone = new DropZone();
       dropTargetItem = new DropTarget(fileListArea, dropZone);
       setVisible(true);
   }

   // This is called after files are dragged into TextArea
   public void postDragDrop() {
       uploadButton.setEnabled(true);
   }

   // Called right before each file gets uploaded
   public void preUpload() {
       progressBar.setValue(0);
       progressBar.setStringPainted(true);
   }

   // Called right after each file is finished uploading
   public void postUpload() {
       progressBar.setValue(0);
       progressBar.setStringPainted(false);
       fileListArea.setText("");
   }

   // Make FTP connection
   public void connectToFTP() {
       try {
           ftp = new FtpClient();
           String serverName = "<MY FTP SERVER>";
           ftp.openServer(serverName, 21);
           if (ftp.serverIsOpen()) {
               System.out.println("Connected to " + serverName);
               try {
                   ftp.login("<MY USERNAME>", "<MY PASSWORD>");
                   System.out.println("Welcome message:\n" +
ftp.welcomeMsg);
                   System.out.println("Current Directory: " +
ftp.pwd());
               } catch (Exception ftpe) {
                   ftpe.printStackTrace();
               }
           } else {
               System.out.println("Unable to connect to" +
serverName);
           }
           System.out.println("Finished");
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

   // Disconnect from FTP
   public void disconnectFTP() {
       try {
           ftp.closeServer();
       } catch (Exception ioe) {

       }
   }

   // Upload a given file
   public void doUpload(String filename) {
       if (ftp.serverIsOpen()) {
           try {
               System.out.println("Uploading file " + filename);
               ftp.binary();
               String basename;
               basename = filename.substring(filename
                       .lastIndexOf(File.separator) + 1,
filename.length());
               int i = 0;
               double bytesUploaded = 0;
               File fileInfo = new File(filename);
               byte[] bytesIn = new byte[1024];
               try {
                   FileInputStream in = new FileInputStream(filename);
                   BufferedOutputStream out = new
BufferedOutputStream(ftp
                           .put(basename));
                   int percVal = 0;
                   while ((i = in.read(bytesIn)) >= 0) {
                       bytesUploaded += i;
                       percVal = (int) ((bytesUploaded /
fileInfo.length()) * 100);
                       currentFileUpPercent = percVal;
                       progressBar.setValue(currentFileUpPercent);

                       System.out.println("Percent Uploaded: " +
percVal);
                       out.write(bytesIn, 0, i);
                   }
                   in.close();
                   out.close();
               } catch (Exception e) {
               }
           } catch (Exception ftpe) {
               ftpe.printStackTrace();
           }

       } else {
           System.out.println("Not connected...");
       }
   }

   public static void main(String[] args) {

   }
}