Java 监听进度条的变化事件(基础篇

import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.SwingWorker;import javax.swing.UIManager;import javax.swing.JProgressBar;import javax.swing.JLabel;import javax.swing.event.ChangeListener;import javax.swing.event.ChangeEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.List;import java.awt.Font;import javax.swing.SwingConstants;public class StateChangeBar extends JFrame { /** * */ private static final long serialVersionUID = 3631585803783649593L; private JPanel contentPane; private JProgressBar progressBar; private JLabel label; /** * Launch the application. */ public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Throwable e) { e.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { StateChangeBar frame = new StateChangeBar(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public StateChangeBar() { addWindowListener(new WindowAdapter() { @Override public void windowActivated(WindowEvent e) { do_this_windowActivated(e); } }); setTitle("\u95EA\u5C4F\u754C\u9762"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 250, 100); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); progressBar = new JProgressBar(); progressBar.setStringPainted(true); progressBar.setFont(new Font("微软雅黑", Font.PLAIN, 16)); progressBar.addChangeListener(new ChangeListener() { public void stateChanged(ChangeEvent e) { do_progressBar_stateChanged(e); } }); contentPane.add(progressBar, BorderLayout.SOUTH); label = new JLabel("\u7A0B\u5E8F\u6B63\u5728\u542F\u52A8\u4E2D\u3002\u3002\u3002"); label.setHorizontalAlignment(SwingConstants.CENTER); label.setFont(new Font("微软雅黑", Font.PLAIN, 16)); contentPane.add(label, BorderLayout.CENTER); } protected void do_progressBar_stateChanged(ChangeEvent e) { JProgressBar comp = (JProgressBar) e.getSource(); int value = comp.getValue(); if (value == 100) { label.setText("程序启动完毕！"); comp.setVisible(false); } } protected void do_this_windowActivated(WindowEvent e) { Activity activity = new Activity(); activity.execute(); } private class Activity extends SwingWorker<Void, Integer> { @Override protected Void doInBackground() throws Exception { for (int i = 1; i < 101; i ) { Thread.sleep(100); publish(i); } return null; } @Override protected void process(List<Integer> chunks) { for (Integer chunk : chunks) { progressBar.setValue(chunk); } } }}