如何使我的SwingWorker示例正常工作？

Question

我制作了自己的SwingWorker示例，以熟悉其工作原理。我要执行的操作如下：单击按钮时，我希望进度条出现直到任务完成，我只想删除进度条并向对话框添加字符串。单击该按钮时，进度条会出现，但永远不会消失。（千万不要在10秒后删除进度条，也不要将标签放在上方）这是一个SSCCE：package swingtesting;import java.awt.event.ActionEvent; import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JProgressBar;import javax.swing.SwingWorker;public class SwingTesting {    /**     * Creates a frame that will hold a simple button to make use of SwingWorker     */     public static void main(String[] args) {         // TODO code application logic here         JFrame frame = new JFrame();         JButton button = new JButton();         button.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                new GuiWorker().execute();            }         });         button.setText("Test Me");         frame.getContentPane().add(button);         frame.pack();         frame.setVisible(true);    }}class GuiWorker extends SwingWorker<Integer, Integer> {    /*     * This should just create a frame that will hold a progress bar until the     * work is done. Once done, it should remove the progress bar from the dialog     * and add a label saying the task complete.     */    private JFrame frame = new JFrame();    private JDialog dialog = new JDialog(frame, "Swingworker test", true);    private JProgressBar progressBar = new JProgressBar();    public GuiWorker() {        progressBar.setString("Waiting on time");        progressBar.setStringPainted(true);        progressBar.setIndeterminate(true);        dialog.getContentPane().add(progressBar);        dialog.pack();        dialog.setVisible(true);    }    @Override    protected Integer doInBackground() throws Exception {        Thread.sleep(10000);        return 0;    }

Answer 1

这是您的代码的更新版本，可以使用

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JProgressBar;

import javax.swing.SwingWorker;

public class SwingTesting {

  public static void main(String[] args) {

    EventQueue.invokeLater( new Runnable() {

      @Override

      public void run() {

        JFrame frame = new JFrame();

        JButton button = new JButton();

        button.addActionListener(new ActionListener() {

          @Override

          public void actionPerformed(ActionEvent e) {

            new GuiWorker().execute();

          }

        });

        button.setText("Test Me");

        frame.getContentPane().add(button);

        frame.pack();

        frame.setVisible(true);

      }

    } );

  }

}

class GuiWorker extends SwingWorker<Integer, Integer> {

  /*

  * This should just create a frame that will hold a progress bar until the

  * work is done. Once done, it should remove the progress bar from the dialog

  * and add a label saying the task complete.

  */

  private JFrame frame = new JFrame();

  private JDialog dialog = new JDialog(frame, "Swingworker test", true);

  private JProgressBar progressBar = new JProgressBar();

  public GuiWorker() {

    progressBar.setString("Waiting on time");

    progressBar.setStringPainted(true);

    progressBar.setIndeterminate(true);

    dialog.getContentPane().add(progressBar);

    dialog.pack();

    dialog.setModal( false );

    dialog.setVisible(true);

  }

  @Override

  protected Integer doInBackground() throws Exception {

    System.out.println( "GuiWorker.doInBackground" );

    Thread.sleep(1000);

    return 0;

  }

  @Override

  protected void done() {

    System.out.println("done");

    JLabel label = new JLabel("Task Complete");

    dialog.getContentPane().remove(progressBar);

    dialog.getContentPane().add(label);

    dialog.getContentPane().validate();

  }

}

关键是设置模型对话框可见块，直到对话框被处理为止。因此，validate在切换组件时，使其成为非模式固定+ 内容窗格上的调用。我还调整了您的主要方法以在EDT上运行，并添加了一些System.out调用。如果删除setModal( false )呼叫，您将看到在关闭对话框之前不会打印这些语句