初识 进度条JProgressBar

ProgressBarTest类：

　　实现接口：ActionListener,PropertiesChangeListener

　　覆盖方法：actionPerformed(),propertyChange()

Task类：

　　继承SwingWorker<Void,Void>

　　覆盖方法doInBackground()

Important Code:

　　66~86

package com.slh.swing;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.concurrent.TimeUnit;

import javax.swing.*;

public class ProgressBarTest extends JPanel implements ActionListener,
    PropertyChangeListener {
  private JButton startButton;
  private JProgressBar progressBar;
  private JTextArea taskOutput;
  private Task task;

  class Task extends SwingWorker<Void, Void> {

    @Override
    protected Void doInBackground() throws Exception {
      int progress=0;
      while(progress<100){
        Thread.sleep(1000);
        progress+=10;
        setProgress(Math.min(progress,100));
      }
      return null;
    }
    protected void done(){
      startButton.setEnabled(true);
      setCursor(null);
      taskOutput.append("Done!\n");
    }

  }

  public ProgressBarTest() {
    super(new BorderLayout());
    initComponent();
  }

  private void initComponent() {
    startButton = new JButton("start");
    //startButton.setActionCommand("start");//
    startButton.addActionListener(this);
    
    progressBar=new JProgressBar();
    progressBar.setValue(0);
    progressBar.setStringPainted(true);//
    
    taskOutput=new JTextArea(5,20);
    taskOutput.setMargin(new Insets(5,5,5,5));
    taskOutput.setEditable(false);
    
    JPanel jPanel=new JPanel();
    jPanel.add(startButton);
    jPanel.add(progressBar);
    
    add(jPanel,BorderLayout.PAGE_START);
    add(new JScrollPane(taskOutput),BorderLayout.CENTER);
    setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
  }

  @Override
  public void propertyChange(PropertyChangeEvent evt) {
    // TODO Auto-generated method stub
    if("progress"==evt.getPropertyName()){
      int progress=(Integer) evt.getNewValue();
      progressBar.setValue(progress);
      taskOutput.append("当前进度"+progress+"%\n");
    }

  }

  @Override
  public void actionPerformed(ActionEvent e) {
    startButton.setEnabled(false);
    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    task=new Task();
    task.addPropertyChangeListener(this);
    task.execute();
  }

  private static void createAndShowGUI() {
    JFrame jFrame = new JFrame();
    jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JComponent pbt = new ProgressBarTest();
    pbt.setOpaque(true);
    jFrame.setContentPane(pbt);

    jFrame.pack();
    jFrame.setVisible(true);
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }

}