Java实现把窗体隐藏到系统托盘方法

import java.awt.AWTException;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.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.ImageIcon;import javax.swing.JFrame;public class TestTray extends JFrame { private static final long serialVersionUID = -7078030311369039390L; public TestTray() { this.setSize(500, 400); this.setLocationRelativeTo(null);// 把窗体设置在屏幕中间 systemTray(); // 设置系统托盘 // 添加关闭按钮事件，关闭时候实质是把窗体隐藏 this.addWindowListener(new WindowAdapter() {  @Override  public void windowClosing(WindowEvent e) {  TestTray.this.setVisible(false);  } }); this.setVisible(true); } /** * 处理系统托盘 */ private void systemTray() { if (SystemTray.isSupported()) { // 判断系统是否支持托盘功能.  // 创建托盘右击弹出菜单  PopupMenu popupMenu = new PopupMenu();    //创建弹出菜单中的退出项  MenuItem itemExit = new MenuItem("退出系统");  itemExit.addActionListener(new ActionListener() {   @Override   public void actionPerformed(ActionEvent e) {    System.exit(0);   }   });  popupMenu.add(itemExit);    //创建托盘图标  ImageIcon icon = new ImageIcon("img/icon.png"); // 创建图片对象  TrayIcon trayIcon = new TrayIcon(icon.getImage(), "测试系统托盘",   popupMenu);  trayIcon.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {   TestTray.this.setVisible(true);  }  });    //把托盘图标添加到系统托盘  //这个可以点击关闭之后再放到托盘里面，在此是打开程序直接显示托盘图标了  try {  SystemTray.getSystemTray().add(trayIcon);  } catch (AWTException e1) {  e1.printStackTrace();  } } } public static void main(String[] args) { new TestTray(); }}