java-SwingWorker,未调用done()方法

这只是SwingWorker的一个实现：

class GuiWorker extends SwingWorker<Integer, Integer> {
    private JFrame frame = new JFrame();
    private JDialog dialog = new JDialog(frame, "Loadin data", true);
    private JProgressBar progressBar = new JProgressBar();

    private Statistics st = new Statistics();

    public GuiWorker(GraphEditor editor, Statistics st) {
        this.st = st;

        Window mainWindow = SwingUtilities.windowForComponent(editor
                .getGraphComponent().getParent());
        dialog.setSize(400, 200);

        int x = mainWindow.getX() + (mainWindow.getWidth() - dialog.getWidth())
                / 2;
        int y = mainWindow.getY()
                + (mainWindow.getHeight() - dialog.getHeight()) / 2;
        progressBar.setString("Have fun to wait some time...");
        progressBar.setStringPainted(true);
        progressBar.setIndeterminate(true);
        dialog.add(progressBar);
        dialog.setModal(true);
        dialog.setLocation(x, y);
        dialog.setVisible(true);
    }

    @Override
    protected Integer doInBackground() throws Exception {
        st.loadInitialData();
        return 0;
    }

    @Override
    protected void done() {
        dialog.setVisible(false);
        JLabel label = new JLabel("Task Complete");
        dialog.getContentPane().remove(progressBar);
        dialog.getContentPane().add(label);
        dialog.getContentPane().validate();
        dialog.setVisible(false);
    }
}

诊断日志永远不会隐藏的问题,直到我强行关闭它(任务完成后必须隐藏).
我注意到loadInitialData()方法是一种从我的数据库中收集一些统计信息的方法,这需要花费几秒钟的时间.

更新：我确定仅在关闭对话框时才会调用done()方法.

更新：
我在使用GuiWorker的位置在这里：

mainTabs.addChangeListener(new ChangeListener() {
                @Override
                public void stateChanged(ChangeEvent e) {
                    switch (mainTabs.getSelectedIndex()) {
                    case 0:
                    case 1:
                    case 2: // stats tab
                        GuiWorker gw = new GuiWorker(editor,st);
                        gw.execute();
                        break;
                    default:
                        break;
                    }
                }
            });

解决方法:

所有的摆动事件都在Event Dispatch Thread内部运行.因此,添加到mainTab中的ChangeListener在事件调度线程中运行.

在事件侦听器中,您将实例化GuiWorker,并在该构造函数中通过调用dialog.setVisible(true);打开对话框.

您的JDialog实例是模态的,在模态对话框上调用setVislbe(true)将阻塞调用线程,在您的情况下为事件调度线程.因此,在关闭对话框之前,请执行gw.execute();.不被调用.这就是为什么在关闭对话框之前不会调用您的done方法.

为了使代码正常工作,可以尝试不要在构造函数中调用setVisible(true),而是从GuiWorker提供一种方法来设置对话框的可见性.然后在调用gw.execute();之后；呼叫gw.setVisible(true).

为了澄清,尝试

class GuiWorker extends SwingWorker<Integer, Integer> {
    private JFrame frame = new JFrame();
    private JDialog dialog = new JDialog(frame, "Loadin data", true);
    private JProgressBar progressBar = new JProgressBar();

    private Statistics st = new Statistics();

    public GuiWorker(GraphEditor editor, Statistics st) {
        this.st = st;

        Window mainWindow = SwingUtilities.windowForComponent(editor
                .getGraphComponent().getParent());
        dialog.setSize(400, 200);

        int x = mainWindow.getX() + (mainWindow.getWidth() - dialog.getWidth())
                / 2;
        int y = mainWindow.getY()
                + (mainWindow.getHeight() - dialog.getHeight()) / 2;
        progressBar.setString("Have fun to wait some time...");
        progressBar.setStringPainted(true);
        progressBar.setIndeterminate(true);
        dialog.add(progressBar);
        dialog.setModal(true);
        dialog.setLocation(x, y);
    }

    @Override
    protected Integer doInBackground() throws Exception {
        st.loadInitialData();
        return 0;
    }

    @Override
    protected void done() {
        dialog.setVisible(false);
        JLabel label = new JLabel("Task Complete");
        dialog.getContentPane().remove(progressBar);
        dialog.getContentPane().add(label);
        dialog.getContentPane().validate();
        dialog.setVisible(false);
    }

   public void setVisible(boolean visible) {
        dialog.setVisible(visible);
   }
}

和

mainTabs.addChangeListener(new ChangeListener() {
                @Override
                public void stateChanged(ChangeEvent e) {
                    switch (mainTabs.getSelectedIndex()) {
                    case 0:
                    case 1:
                    case 2: // stats tab
                        GuiWorker gw = new GuiWorker(editor,st);
                        gw.execute();
                        gw.setVisible(true);
                        break;
                    default:
                        break;
                    }
                }
            });

标签：swingworker,multithreading,swing,java
来源： https://codeday.me/bug/20191029/1961485.html