如何在java中用ProgressBar将文件从path复制到path

import javax.swing.*;
import java.awt.*;
import java.io.*;

public class FileCopyWithProgressBar extends JFrame {
    private JProgressBar progressBar;
    private JLabel statusLabel;

    public FileCopyWithProgressBar() {
        setTitle("File Copy with Progress Bar");
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        progressBar = new JProgressBar(0, 100);
        progressBar.setValue(0);
        progressBar.setStringPainted(true);

        statusLabel = new JLabel("Ready");

        add(progressBar, BorderLayout.CENTER);
        add(statusLabel, BorderLayout.SOUTH);
    }

    public void copyFile(String sourcePath, String destPath) {
        try (InputStream in = new FileInputStream(sourcePath);
             OutputStream out = new FileOutputStream(destPath)) {

            byte[] buffer = new byte[1024];
            int bytesRead;
            long totalBytesRead = 0;
            long fileSize = new File(sourcePath).length();

            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
                totalBytesRead += bytesRead;
                int progress = (int) ((totalBytesRead / (double) fileSize) * 100);
                progressBar.setValue(progress);
                statusLabel.setText("Copying... " + progress + "%");
            }

            statusLabel.setText("Copy complete!");
        } catch (IOException e) {
            statusLabel.setText("Error: " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            FileCopyWithProgressBar frame = new FileCopyWithProgressBar();
            frame.setVisible(true);

            // Example usage
            frame.copyFile("path/to/source/file.txt", "path/to/destination/file.txt");
        });
    }
}