Eu estou tentando obter uma barra de progresso para refletir com precisão o meu SwingWorker. Mas eu realmente não consigo descobrir como fazer isso. Eu tenho a barra para apenas fazer uma animação estática até que a operação seja concluída, mas eu quero uma barra ativa real.

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package frglauncher;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

/**
 *
 * @author KYLE-LAPTOP
 */
class DownloadWorker extends SwingWorker<String, Object> {

    private String game;
    private JProgressBar bar;
    private JLabel label;

    public DownloadWorker(JProgressBar bar, String game, JLabel label) {
        this.game = game;
        this.bar = bar;
        this.label = label;
    }

    @Override
    public String doInBackground() {

        // Download here
        label.setText("test");
        try {
            // ProgressBar/Install
            System.out.println("FILELOCATION:\n----------");
            String URL_LOCATION = "http://www.futureretrogaming.tk/gamefiles/ProfessorPhys.jar";
            String LOCAL_FILE = ("\\" + game + "\\");
            File localfile = new File(LOCAL_FILE);
            if (localfile.exists()) {
                System.out.println("Directory exists!");
            }
            else {
                System.out.println("Directory doesn't exist! Creating...");
                localfile.mkdir();
                if (localfile.exists()) {
                    System.out.println("Directory created!");
                }
            }
            System.out.println("LOCALFILE:\n-------");
            System.out.println(LOCAL_FILE);
            URL website = new URL(URL_LOCATION);
            ReadableByteChannel rbc = Channels.newChannel(website.openStream());
            FileOutputStream fos = new FileOutputStream(LOCAL_FILE + "\\ProfessorPhys.jar\\");
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
            System.out.println("--------\nDone Downloading\n---------");

            RandomAccessFile randomAccessFile = null;

            File file = new File(LOCAL_FILE + "ProfessorPhys.jar\\");
            JarFile jar = new JarFile(file);
            Enumeration enum1 = jar.entries();
            while (enum1.hasMoreElements()) {
                JarEntry file1 = (JarEntry) enum1.nextElement();
                System.out.println("Directory to extract: " + LOCAL_FILE);
                System.out.println("\n" + file1.getName() + "\n");
                File f = new File(file1.getName());
                if (file1.isDirectory()) { // If it's a directory, create it
                    f.mkdir();
                    continue;
                }
                try (InputStream is1 = jar.getInputStream(file1)) {
                    FileOutputStream fos1 = new FileOutputStream(f);
                    while (is1.available() > 0) {  // Write contents of 'is' to 'fos'
                        fos1.write(is1.read());
                    }
                    fos1.close();
                }
            }
        }
        catch (FileNotFoundException ex) {
            Logger.getLogger(DownloadWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
        catch (MalformedURLException ex) {
            Logger.getLogger(DownloadWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
        catch (IOException ex) {
            Logger.getLogger(DownloadWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
        return "done";
    }

    @Override
    protected void done() {

        // Done
        label.setText("Download of " + game + "is done.");
        System.exit(0);
    }
}