java - 如何中止已经启动的 Swing 工作线程？

Question

如果我通过调用它的execute() 启动了一个SwingWorker 线程。有什么办法可以在执行时中断它吗？

Answer 1

如果你控制了S​​wingWorker的代码，你可以轮询isCancelled()在doInBackground()中的适当位置，然后如果返回 true 则停止工作。然后cancel当你愿意时， worker :

class YourWorker extends SwingWorker<Foo, Bar> {

    // ...

    protected Foo doInBackground() throws Exception {
        while (someCondition) {
            publish(doSomeIntermediateWork());
            if (isCancelled())
                return null; // we're cancelled, abort work
        }
        return calculateFinalResult();
    }

}

// To abort the task:
YourWorker worker = new YourWorker(args);
worker.execute();
doSomeOtherStuff();
if (weWantToCancel)
    worker.cancel(false); // or true, doesn't matter to us here

现在，正如您所指出的，cancel(boolean) 可能会失败，但为什么呢？ Javadocs通知我们:

Returns:

false if the task could not be cancelled, typically because it has already completed normally; true otherwise.