停止/取消SwingWorker线程？

Question

我正试图找出如何在按下按钮时停止运行SwingWorker线程.我一直在四处寻找,我在解决如何做到这一点时遇到了一些麻烦.目前这就是我所拥有的:

new MySwingWorkerClass(args).execute();

我正在创建一个按钮,我想用它来停止线程:

button = new JButton("Stop");
button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) 
        {
        // Stop the swing worker thread
        }
});

我已经环顾四周寻找答案,到目前为止我已经设法找到了取消方法.我不明白如何使用它来阻止我的摇摆工作者.我尝试了以下但它不起作用:

SwingWorker.cancel(true);

Answer 1

你需要一个不断引用到你的SwingWorker,然后使用该引用取消工作线程.

MySwingWorker myWorker = new MySwingWorkerClass(args).execute();

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) 
    {
        // Stop the swing worker thread
        myWorker.cancel(true);
    }
});

这是一个完整的例子:

public class WorkerDemo extends JFrame {
    private boolean isStarted = false;
    private JLabel counterLabel = new JLabel("Not started");
    private Worker worker = new Worker();
    private JButton startButton = new JButton(new AbstractAction("Start") {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            if(!isStarted) { 
                worker.execute();
                isStarted = false;
            }
        }

    });
    private JButton stopButton = new JButton(new AbstractAction("Stop") {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            worker.cancel(true);
        }

    });

    public WorkerDemo() {

        add(startButton, BorderLayout.WEST);
        add(counterLabel, BorderLayout.CENTER);
        add(stopButton, BorderLayout.EAST);
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    class Worker extends SwingWorker<Void, Integer> {

        int counter = 0;

        @Override
        protected Void doInBackground() throws Exception {
            while(true) {
                counter++;
                publish(counter);
                Thread.sleep(60);
            }
        }

        @Override
        protected void process(List<Integer> chunk) {

            // get last result
            Integer counterChunk = chunk.get(chunk.size()-1);

            counterLabel.setText(counterChunk.toString());
        }

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new WorkerDemo();
            }

        });
    }

}

Answer 2

您需要定期检查其取消的标志(即isCancelled()).SwingWorker留下如何处理中断到你.

有关更多信息,请参阅取消后台任务.