Java Swing ProgressBar 在计算时更新

Question

类似问题有一些例子( Progress Bar Java ) 和 ( Java uploading percentage progressbar thread ) 但不明白如何让它适用于我的代码。

我的主面板有 2 个面板(其中一个是带有 2 个选项卡的 tabbedPane)

public class MainIRH {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }
                MainWindow window = new MainWindow();
                JPanel mainPanel = new JPanel(new BorderLayout(0, 20));
                mainPanel.setBorder(new EmptyBorder(20, 20, 20, 20));

                JTabbedPane tabbedPane = new JTabbedPane();
                tabbedPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));

                ControlPanel controlPanel = new ControlPanel();

                tabbedPane.setBorder(new EmptyBorder(10, 10, 10, 10));
                controlPanel.setBorder(new EmptyBorder(0, 20, 20, 20));

                ECPanel ecPanel = new ECPanel();
                SMRPanel smrPanel = new SMRPanel();

                tabbedPane.addTab("Environnement Canada", null, ecPanel, "Convertir des données des stations d\'Environnement Canada");
                tabbedPane.addTab("Station Météo Routière", null, smrPanel, "Convertir des données des stations météos routières");

                mainPanel.add(tabbedPane, BorderLayout.NORTH);
                mainPanel.add(controlPanel, BorderLayout.CENTER);
                window.add(mainPanel);

                new ControllerIRH(ecPanel, smrPanel, controlPanel);

                window.setVisible(true);
            }
        });
    }
}

重要的是这个对象:SMRPanel smrPanel = new SMRPanel();

在这个对象中，我有一个 JButton convertArchiveButton，我从 Controller 类添加了一个 ActionListener

public void addConvertArchiveButton(ActionListener ConvertArchiveButton) {
    convertArchiveButton.addActionListener(ConvertArchiveButton);
}

这里是Controller中Listener的实现

private class ConvertArchiveButtonListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent event) {
             converter.convert();
    }
}

converter 是执行冗长操作的类

File[] listOfFiles = folder.listFiles();

for (int file = 0; file < listOfFiles.length; file++) {

     int progress = Math.round(file * 100 / listOfFiles.length);

     //tried a lot of things here...

    //...computing

}

我的示例尝试使用 EventQueue 和 SwingUtilities 添加一些新的 Runnable，但没有成功。 SwingWorker 类会有用吗？不太明白用途。

基本上，int Progress 将被传递到 SMRPanel 中的 JProgressBar。

使用 ControlAltDel 编辑答案:

仍然不起作用，converter.readFile(file); 没有被调用。

private class ConvertArchiveButtonListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent event) {
        File[] listOfFiles = folder.listFiles();

        System.out.println(listOfFiles.length);

        for (int i = 0; i < listOfFiles.length; i++) {
            final File file = listOfFiles[i];
            final int idx = (i * 100) / listOfFiles.length;
            Thread t = new Thread(new Runnable() {
                public void run() {
                    converter.readFile(file);

                    System.out.println(idx);

                    SwingUtilities.invokeLater(new Runnable() {

                        @Override
                        public void run() {
                            smrPanel.setProgressBarValue(idx);
                        }
                    });
                }
            });

            try {
                t.start();
                t.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        converter.convert(year);

    }
}

Answer 1

您的问题是您正在 EDT 线程中运行循环。通过在另一个线程中运行此修复，然后在完成处理文件时在 EDT 中设置更新的进度值

private class ConvertArchiveButtonListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent event) {
            new Thread(new Runnable() {
            public void run() {
               for (int file = 0; file < listOfFiles.length; file++) {
                  final File f = listOfFiles[i];
                  final idx = file;
                  Thread t = new Thread(new Runnable() {
                    converter.convert(f);
                    swingUtilities.invokeLater(new Runnable() {
                      myProgressBar.setValue(idx);
                    });
                   t.start();
                   t.join();
                  });
                 }
             }).start();
    }
}