Java:将值连续读取到多个从未完成的 jprogressbars

Question

我在 Java GUI 应用程序中有 3 个“JProgressBars”，我需要以恒定的时间间隔不断更新值。

这是我的应用程序，突出显示的是我要将值读入其中的进度表。

要读取每个进度表的值，我的对象中有 3 个方法(这里是机器人类)示例:

robot.readBattery();
robot.readSonic();
robot.readLight();

所有方法都会返回 0 到 100 之间的值。

我已经看到可以使用 swingworker 完成单个进度条。那么这是否意味着我的程序中需要 3 个 swing worker 类来服务所有三个进度条？

即使我这样做了，属性更改监听器如何区分进度条？

如果有人能指导我解决这个问题，我将不胜感激。

我在机器人中有一个连接方法，如果程序连接到机器人，它会返回 true。

即:boolean connected = robot.connect();

所以在 swingworker 中，代码应该是这样的，

while (true) {
    if (connected){
    setProgress(robot.readBattery());
    }

    sleep(1000);
}

我可能是错的。请指导我。

要求的 SSCCE:

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

public class Tester extends JFrame implements PropertyChangeListener,
        ActionListener {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private JProgressBar batteryMeter, lightMeter, sonicMeter;

    private Robot robot = new Robot();
    private BatteryTask bt;

    private JButton start = new JButton("Start");

    public Tester() {

        JPanel statusPanel = new JPanel();
        statusPanel.setLayout(new GridBagLayout());

        GridBagConstraints c = new GridBagConstraints();
        c.insets = new Insets(2, 4, 2, 4);
        c.fill = GridBagConstraints.HORIZONTAL;

        c.gridx = 0;
        c.gridy = 0;
        statusPanel.add(new JLabel("Battery Level:"), c);

        batteryMeter = new JProgressBar(0, 100);
        batteryMeter.setStringPainted(false);
        batteryMeter.setPreferredSize(new Dimension(215, 15));
        batteryMeter.setValue(0);
        c.gridx = 1;
        c.gridy = 0;
        statusPanel.add(batteryMeter, c);

        c.gridx = 0;
        c.gridy = 1;
        statusPanel.add(new JLabel("Light Sensor:"), c);

        lightMeter = new JProgressBar(0, 100);
        lightMeter.setStringPainted(false);
        lightMeter.setPreferredSize(new Dimension(215, 15));
        lightMeter.setValue(0);
        c.gridx = 1;
        c.gridy = 1;
        statusPanel.add(lightMeter, c);
        c.gridx = 0;
        c.gridy = 2;
        statusPanel.add(new JLabel("Ultrasonic Sensor:"), c);

        sonicMeter = new JProgressBar(0, 100);
        sonicMeter.setStringPainted(false);
        sonicMeter.setPreferredSize(new Dimension(215, 15));
        sonicMeter.setValue(0);
        c.gridx = 1;
        c.gridy = 2;
        statusPanel.add(sonicMeter, c);
        c.gridx = 0;
        c.gridy = 3;

            start.addActionListener(this);
        statusPanel.add(start, c);
        this.getContentPane().add(statusPanel);

        this.setSize(500, 300);

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.pack();
        this.setVisible(true);

    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Tester();
            }
        });

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

        if (e.getSource() == start) {

            bt = new BatteryTask();
            bt.addPropertyChangeListener(this);
            bt.execute();
        }

    }

    @Override
    public void propertyChange(PropertyChangeEvent evt) {
        // TODO Auto-generated method stub
        if ("progress" == evt.getPropertyName()) {
            int progress = (Integer) evt.getNewValue();
            batteryMeter.setValue(progress);
        }

    }

    class BatteryTask extends SwingWorker<Void, Void> {
        /*
         * Main task. Executed in background thread.
         */
        @Override
        public Void doInBackground() {

            // Initialize progress property.
            setProgress(0);
            while (true) {
                // Sleep for up to one second.
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException ignore) {
                }
                // Make random progress.

                setProgress(robot.readBattery());
            }
        }

    }

}

class Robot {

    private Random r = new Random();

    int readBattery() {

        int i = r.nextInt(100 - 1) + 1;
        System.out.println(i);
        return i;
    }

    int readSonic() {

        return r.nextInt(100 - 1) + 1;
    }

    int readLight() {

        return r.nextInt(100 - 1) + 1;
    }
}

Answer 1

名为“progress”的 PropertyChangeEvent 仅传达一个值，与 worker 的整体进度无关。相反，让单个 RobotTask 后台线程 publish() 一个 StatusRecord 保存三个新值。 worker 的 process() 方法在事件派发线程上执行，可以在新记录到达时更新三个进度条。有相关例子here和 here .

class RobotTask extends SwingWorker<StatusRecord, StatusRecord> {…}