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); } @Override public void actionPerformed(ActionEvent ex) { // TODO Auto-generated method stub if(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 block e.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(); } }