java - 如何使用两个Swing Worker实例？

Question

我已经创建了 SwingWorker 实例并将其安排在工作 thread(tAccess = new TimeAccess()).execute()) 这个实例中以访问时间。但我需要另一个 Swing Worker 实例来持续访问数据库。这个怎么做？

// when execute both instances ,sometimes GUI become unresponsive. 

tAccess = new TimeAccess()).execute(); 
dAccess = new DataAccess()).execute();

代码:

public class DataAccess extends SwingWorker<Void, ArrayList<TimeTable>> {

    @Override
    protected Void doInBackground() throws SQLException, ClassNotFoundException {
        int timeRun = 0;
        ArrayList<TimeTable> timeList = null;
        while (timeRun == 0) {
            timeList = TimeTableController.viewTimeTable();
            publish(timeList);

        }
        return null;
    }

    @Override
    protected void process(List<ArrayList<TimeTable>> dataList) {
        ArrayList<TimeTable> timeArray = dataList.get(dataList.size() - 1);
        DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
        int x = 0;
        for (TimeTable time : timeArray) {
            dtm.setValueAt(time.getCity() + "          " + time.getTime(), x, 0);
            dtm.setValueAt(time.getCity() + "          " + time.getTime(), x, 1);
            x = x + 1;
           // System.out.println(x);
            System.out.println(javax.swing.SwingUtilities.isEventDispatchThread() + "database thread chkr");

        }

    }

}


 private class TimeAccess extends SwingWorker<Void, String> {

    @Override
    protected Void doInBackground() {
        int timeRun = 0;
        while (timeRun == 0) {
            Calendar cal = Calendar.getInstance();
            cal.getTime();
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            System.out.println(sdf.format(cal.getTime()));
            String timeNow = sdf.format(cal.getTime());

            publish(timeNow);

        }
        return null;
    }

    @Override
    protected void process(List<String> timeList) {
        String time = timeList.get(timeList.size() - 1);
        clockLabel.setText(time);
        System.out.println(javax.swing.SwingUtilities.isEventDispatchThread());
    }

}

Answer 1

问题似乎是这里有一个无限循环:

while (timeRun == 0) {

调用一些方法:

TimeTableController.viewTimeTable();

我假设这个方法不会阻塞，或者任何合理的事情。所以:

1. 工作线程循环并每秒调用publish很多次；那么
2. 发布会获取所有数据，并且每次都会更新整个显示表格。

这显然占用了 EDT 的所有时间 - 试图跟上您要求的更新。

所以，使用 SwingWorker 做得很好。多思考一下你的逻辑。