Java Spring Boot 使用系统托盘图标

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在 Java Spring Boot 中使用系统托盘图标需要使用 Java AWT 和 Java Swing 库。以下是实现步骤：

1. 导入 Java AWT 和 Java Swing 库。

```java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
```

2. 创建一个系统托盘图标。

```java
if (SystemTray.isSupported()) {
    SystemTray tray = SystemTray.getSystemTray();
    Image image = Toolkit.getDefaultToolkit().getImage("icon.png");
    PopupMenu popup = new PopupMenu();
    MenuItem exitItem = new MenuItem("Exit");
    exitItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.exit(0);
        }
    });
    popup.add(exitItem);
    TrayIcon trayIcon = new TrayIcon(image, "My Application", popup);
    trayIcon.setImageAutoSize(true);
    try {
        tray.add(trayIcon);
    } catch (AWTException e) {
        System.err.println("TrayIcon could not be added.");
    }
}
```

3. 添加一个双击系统托盘图标的事件。

```java
trayIcon.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        // Do something
    }
});
```

4. 在应用程序退出时移除系统托盘图标。

```java
Runtime.getRuntime().addShutdownHook(new Thread() {
    public void run() {
        SystemTray tray = SystemTray.getSystemTray();
        tray.remove(trayIcon);
    }
});
```

完整代码示例：

```java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TrayIconExample {
    public static void main(String[] args) {
        if (SystemTray.isSupported()) {
            SystemTray tray = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("icon.png");
            PopupMenu popup = new PopupMenu();
            MenuItem exitItem = new MenuItem("Exit");
            exitItem.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    System.exit(0);
                }
            });
            popup.add(exitItem);
            TrayIcon trayIcon = new TrayIcon(image, "My Application", popup);
            trayIcon.setImageAutoSize(true);
            try {
                tray.add(trayIcon);
            } catch (AWTException e) {
                System.err.println("TrayIcon could not be added.");
            }
            trayIcon.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    JOptionPane.showMessageDialog(null, "Hello World!");
                }
            });
            Runtime.getRuntime().addShutdownHook(new Thread() {
                public void run() {
                    tray.remove(trayIcon);
                }
            });
        }
    }
}
```