[置顶] JAVA为程序添加系统托盘

系统托盘是个特殊的区域，可以驻留程序，系统托盘显示在桌面的底部，Windows的系统托盘就显示在任务栏的状态区。
下面是一个创建系统托盘的实例。
package tray;

import java.awt.AWTException;
import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

import javax.swing.*;

public class SystemTrayDemo extends JFrame{

	/**
	 * 为程序添加系统托盘
	 * @author Sun1956
	 */
	private ImageIcon imageIcon;
	private TrayIcon trayIcon;
	private PopupMenu popMenu;
	private MenuItem exit,show;
	private SystemTray systemTray;
	//构造方法
	public SystemTrayDemo() {
		if (SystemTray.isSupported()) {   //判断是否支持系统托盘
		//以system.png为图片创建图标,图片system.png在你的工程目录下(eclipse中，其它IDE没有测试)
			imageIcon = new ImageIcon("system.png");     
			trayIcon = new TrayIcon(imageIcon.getImage());  //创建托盘图标
			trayIcon.setToolTip("系统托盘");
			popMenu = new PopupMenu();      //创建弹出菜单
			//创建菜单项
			exit = new MenuItem("退出");         
			show = new MenuItem("显示主窗体");
			//添加到popMenu
			popMenu.add(show);
			popMenu.add(exit);
			trayIcon.setPopupMenu(popMenu);
			systemTray = SystemTray.getSystemTray();  //获得托盘对象
			try {
				systemTray.add(trayIcon);    //添加托盘图标
			} catch (AWTException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		//添加监听器
			exit.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent arg0) {
					System.exit(0);
				}
			});
			show.addActionListener(new ActionListener() {
				
				@Override
				public void actionPerformed(ActionEvent arg0) {
					showFrame();
				}
			});
		}
	}
	//显示窗体
	public void showFrame() {
		setVisible(true);
	}
	
	//Main method
	public static void main(String[] args) {
		JFrame frame = new SystemTrayDemo();
		frame.setTitle("使用系统托盘");
		frame.setSize(300,200);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);   //注意: 不能设置为JFrame.EXIT_ON_CLOSE,否则会直接退出程序

	}

}