用于更新主 Gui 的 java swingworker 线程 [英] java swingworker thread to update main Gui

问题描述

我想知道从 Swingworkerthread 向 jtextarea 添加文本的最佳方法是什么，我创建了另一个类，jbutton 通过 Threadsclass().execute(); 调用该类；并且线程与此代码并行运行

hi id like to know whats the best way to add text to a jtextarea from a swingworkerthread, ive created another class which a jbutton calls by Threadsclass().execute(); and the thread runs in parallel fine with this code

public class Threadsclass extends SwingWorker<Object, Object> {


@Override
protected Object doInBackground() throws Exception {
    for(int x = 0; x< 10;x++)
        try {
            System.out.println("sleep number :"+ x);



        Thread.sleep(1000);
    } catch (InterruptedException ex) {
        Logger.getLogger(eftcespbillpaymentsThreads.class.getName()).log(Level.SEVERE, null, ex);
    }
    throw new UnsupportedOperationException("Not supported yet.");
}

}

现在 id 喜欢做的是将 x 的值添加到主 gui 上的文本区域，非常感谢任何想法.

now what id like to do is add the value of x to the text area on the main gui, any ideas much appreciated.

推荐答案

JavaDocs

class PrimeNumbersTask extends
        SwingWorker<List<Integer>, Integer> {

    PrimeNumbersTask(JTextArea textArea, int numbersToFind) {
        //initialize
    }

    @Override
    public List<Integer> doInBackground() {
        List<Integer> numbers = new ArrayList<Integer>(25);
        while (!enough && !isCancelled()) {
            number = nextPrimeNumber();
            numbers.add(number);
            publish(number);
            setProgress(100 * numbers.size() / numbersToFind);
        }

        return numbers;
    }

    @Override
    protected void process(List<Integer> chunks) {
        for (int number : chunks) {
            textArea.append(number + "
");
        }
    }
}

JTextArea textArea = new JTextArea();
final JProgressBar progressBar = new JProgressBar(0, 100);
PrimeNumbersTask task = new PrimeNumbersTask(textArea, N);
task.addPropertyChangeListener(
 new PropertyChangeListener() {
     public  void propertyChange(PropertyChangeEvent evt) {
         if ("progress".equals(evt.getPropertyName())) {
             progressBar.setValue((Integer)evt.getNewValue());
         }
     }
 });

task.execute();
System.out.println(task.get()); //prints all prime numbers we have got

看看发布 和 进程

基本意图是您只需要在事件调度线程内更新 UI，通过 publish 方法将要更新的数据传递到 UI，SwingWorker 将在 EDT 的上下文中为您调用 process

The underlying intention is that you need to update the UI from only within the Event Dispatching Thread, by passing the data you want to updated to the UI via the publish method, SwingWorker will call process for you within the context of the EDT

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