java中系统托盘的实现

很明显，JAVA中的系统托盘，如果要实现，重要的是两个类，一个是SystemTray，而另一个是TrayIcon。需要为TrayIcon设置好图片，它需要显示的信息以及右键点击的PopupMenu.PopupMenu的使用很简单，就是将需要的MenuItem添加入PopupMenu中。

以下是一段示例代码，用于表明系统托盘如何实现。

import java.awt.*;import java.awt.TrayIcon.MessageType;import java.awt.event.*;import javax.swing.*;public class MainFrame extends JFrame implements ActionListener{private JLabel jl1,jl2;private JTextField jt_username;private JPasswordField jp_password;private JButton jb_enter,jb_exit;private TrayIcon trayicon;private void initCompoenent(){setSize(300,200);setLayout(new GridLayout(3,2));jl1=new JLabel("用户名：");jl2=new JLabel("密码：");jt_username=new JTextField();jp_password=new JPasswordField();jb_enter=new JButton("登陆");jb_exit=new JButton("退出");jb_enter.addActionListener(this);jb_exit.addActionListener(this);add(jl1);add(jt_username);add(jl2);add(jp_password);add(jb_enter);add(jb_exit);setVisible(true);}@Overridepublic void actionPerformed(ActionEvent ex) {// TODO Auto-generated method stubif(ex.getSource().equals(jb_enter)){String username=jt_username.getText().toString().trim();String password=String.copyValueOf(jp_password.getPassword());if(username.equals("passzh")&&password.equals("1988")){JOptionPane.showMessageDialog(null, "登陆成功");}else{JOptionPane.showMessageDialog(null, "用户名或密码错误");}}else if(ex.getSource().equals(jb_exit)){System.exit(0);}else if(ex.getSource().equals(trayicon)){if(!isVisible()){setVisible(true);toFront();}}}public MainFrame(){initCompoenent();if(!SystemTray.isSupported()){return;}else{SystemTray systemTray=SystemTray.getSystemTray();String title="登陆窗口";String company="passZh write";Image image=Toolkit.getDefaultToolkit().getImage(getClass().getResource("image/sysTray.png"));trayicon=new TrayIcon(image,title+"/n"+company,createMenu());trayicon.addActionListener(this);try {systemTray.add(trayicon);trayicon.displayMessage(title, company, MessageType.INFO);} catch (AWTException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}private PopupMenu createMenu(){PopupMenu menu=new PopupMenu();MenuItem exit=new MenuItem("关闭");exit.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ex){System.exit(0);}});MenuItem open=new MenuItem("打开");open.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ex){if(!isVisible()){setVisible(true);toFront();}else{toFront();}}});menu.add(open);menu.addSeparator();menu.add(exit);return menu;}public static void main(String[] args){MainFrame mai=new MainFrame();}}