Swing带TrayIcon(托盘小图标)的Hello world示例

 1 package com.xxx.yyy.zzz;
 2 
 3 import javax.swing.JFrame;
 4 
 5 public class MainFrame extends JFrame {
 6 
 7     private static final long serialVersionUID = -3059928131346032935L;
 8     public MainFrame() {
 9         super();
10         this.setSize(300, 200);
11         this.getContentPane().setLayout(null);
12         this.setTitle("Hello world!");
13         /// 设置点击窗口右上角“关闭”时的行为，点击“关闭”时停止主循环，退出程序
14         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
15     }
16 }
17 
18 class Main {
19     public static void main(String[] args) {
20         MainFrame frm = new MainFrame();
21         frm.setVisible(true);
22     }
23 }

 1 /// 实现接口WindowListener
 2 public class MainFrame extends JFrame implements WindowListener{
 3 
 4     private static final long serialVersionUID = -3059928131346032935L;
 5     /// 32*32的png图像
 6     private static Image image = Toolkit.getDefaultToolkit().getImage("/c_cyan.png");
 7     /// TrayIcon对象
 8     private static TrayIcon trayIcon = new TrayIcon(image,"xx助手");
 9 
10     public MainFrame() {
11         super();
12         this.setSize(300, 200);
13         this.getContentPane().setLayout(null);
14         this.setTitle("Hello world!");
15         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
16         /// 注册本窗口Window相关事件监听器
17         this.addWindowListener(this);
18     }
19 
20     public void windowActivated(WindowEvent e) {}
21 
22     public void windowClosed(WindowEvent e) {}
23 
24     public void windowClosing(WindowEvent e) {}
25 
26     public void windowDeactivated(WindowEvent e) {}
27 
28     public void windowDeiconified(WindowEvent e) {
29     }
30 
31     public void windowIconified(WindowEvent e) {
32         /// 检测操作系统是否支持系统托盘
33         if (!SystemTray.isSupported()) {
34             return;
35         }
36 
37         final MainFrame parent = this;
38         final SystemTray systemTray = SystemTray.getSystemTray();
39 
40         /// 设置TrayIcon自动调整图像大小，看来这么设置之后不用再关注图片尺寸了
41         trayIcon.setImageAutoSize(true);
42         /// TrayIcon添加击事件的监听器，点击后恢复主窗口，删除TrayIcon
43         trayIcon.addActionListener(new ActionListener() {
44             public void actionPerformed(ActionEvent event) {
45                 /// 显示主窗口
46                 parent.setVisible(true);
47                 /// 从系统托盘之中移除TrayIcon，因为同一个TrayIcon不能添加两次
48                 systemTray.remove(trayIcon);
49             }
50         });
51 
52         try {
53             /// 往系统托盘之中添加TrayIcon
54             systemTray.add(trayIcon);
55         } catch (AWTException exception) {
56             exception.printStackTrace();
57         }
58 
59         /// 隐藏本窗口
60         parent.setVisible(false);
61     }
62 
63     public void windowOpened(WindowEvent e) {}
64 }