我的代码发送http调用时，我希望它更改窗口上的JLabel（基本上显示在http调用结束之前还剩下多少时间）。由于我在这里问过另一个问题，我一直在研究SwingWorkers，但不确定如何使用它。我编写的代码基本上都有一个循环来发送调用，每次定时运行调用需要多长时间，计算剩余时间，然后将其发送到JLabel（注意，JLabel位于不同的位置）。实例化的对象。

大多数SwingWorker示例显示了一个在后台继续运行的函数，不受工作线程的影响（例如，完全基于时间而不是被代码更改的计数器）。如果是这种情况，那么JLabel的更改不是只是工作线程的一部分，因为代码通过新循环->计算时间并进行调用-> alter JLabel运行吗？我可能错了，但是如何通过代码而不是独立线程来更改JLabel？

我的问题之一是，当我最初设置代码时，JLabel中没有任何变化。

这是我的代码：

package transcription.windows;

import javax.swing.*;

import java.awt.*;

import static javax.swing.JFrame.EXIT_ON_CLOSE;

public class PleaseWaitWindow {

    private JLabel pleaseWaitJLabel = new JLabel("Please wait");
    private GridBagConstraints containerGbc = new GridBagConstraints();
    private Container contentPaneContainer = new Container();
    private JFrame pleaseWaitJFrame;

    public JLabel getPleaseWaitJLabel() {
        return pleaseWaitJLabel;
    }

    public JFrame setPleaseWaitWindow() {
        pleaseWaitJFrame = new JFrame();
        contentPaneContainer = setContentPane();
        pleaseWaitJFrame.setContentPane(contentPaneContainer);
        pleaseWaitJFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        pleaseWaitJFrame.setTitle("");
        pleaseWaitJFrame.setSize(350,150);
        pleaseWaitJFrame.setLocationRelativeTo(null);
        pleaseWaitJFrame.setVisible(true);

        return pleaseWaitJFrame;
    }

    private Container setContentPane() {
        containerGbc.insets.bottom = 1;
        containerGbc.insets.top = 2;
        containerGbc.insets.right = 1;
        containerGbc.insets.left = 1;
        containerGbc.weightx = 1;
        containerGbc.weighty = 1;

        contentPaneContainer.setLayout(new GridBagLayout());
        contentPaneContainer.setSize(800,700);
        setPleaseWaitJLabel();

        return contentPaneContainer;
    }

    private void setPleaseWaitJLabel() {
        containerGbc.gridx = 2;
        containerGbc.gridy = 5;
        containerGbc.gridwidth = 2;
        containerGbc.gridheight = 1;
        contentPaneContainer.add(pleaseWaitJLabel,containerGbc);
    }

    public void setJLabelDisplay(String displayTime) {
        pleaseWaitJLabel.setText(displayTime);
    }

    public void closeWindow() {
        pleaseWaitJFrame.dispose();
    }
    }

属于ServiceUpload类的方法：

    public String cuttingLoop(String mpBase64Piece,String jobName,String email) {
        Integer numberOfPiecesMinusEnd = (int) Math.ceil(mpBase64Piece.length() / 500000.0);
        List<String> base64List = new ArrayList<>();

        for (int i = 0; i < numberOfPiecesMinusEnd; i++) {

            if (mpBase64Piece.length() >= 500000) {
                base64List.add(mpBase64Piece.substring(0,500000));
                mpBase64Piece = mpBase64Piece.substring(500000);
            }

        }
        base64List.add(mpBase64Piece);

        pleaseWaitWindow = new PleaseWaitWindow();
        pleaseWaitWindow.setPleaseWaitWindow();
        for (int n = 0; n < base64List.size(); n++) {
            numberOfLoopsLeft = numberOfPiecesMinusEnd - n;
            Stopwatch stopwatch = null;
            String tag;
            Stopwatch.createStarted();
            if (base64List.get(n) != null) {
                if (n == 0) {
                    tag = "start";
                } else if (n == base64List.size() - 1) {
                    tag = "end";
                } else {
                    tag = "middle";
                }
                stopwatch = Stopwatch.createStarted();
                response = providerupload.executeUploadHttp(base64List.get(n),jobName,tag,email);
                stopwatch.stop();
            }
            long oneLoopTime = stopwatch.elapsed(TimeUnit.SECONDS);
            pleaseWaitWindow.setJLabelDisplay(numberOfLoopsLeft*oneLoopTime+" seconds remaining");
            LOGGER.info("complete");
        }
        pleaseWaitWindow.closeWindow();
        return response;
    }

我的问题之一是上述代码未使用“ SwingWorker”时，代码未显示“ JLabel”。