代碼說明：

在桌面工具欄上顯示托盤

代碼片段：

import java.awt.AWTException;  
import java.awt.Image;  
import java.awt.MenuItem;  
import java.awt.PopupMenu;  
import java.awt.SystemTray;  
import java.awt.Toolkit;  
import java.awt.TrayIcon;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.awt.event.MouseEvent;  
import java.io.UnsupportedEncodingException;  
import java.net.URL;  
import javax.swing.ImageIcon;  
import javax.swing.JFrame;  
import javax.swing.JLabel;  
 
public class SystemTrayDemo extends JFrame{  
    private TrayIcon trayIcon = null;     
    public SystemTrayDemo(){  
        this.setTitle("系統(tǒng)托盤");  
        jbInit();  
        this.setSize(200, 250);  
        this.setLocation(300, 300);  
    }  
    public void jbInit(){  
        if(SystemTray.isSupported()){ //檢查當(dāng)前系統(tǒng)是否支持系統(tǒng)托盤  
             SystemTray tray = SystemTray.getSystemTray();//獲取表示桌面托盤區(qū)的 SystemTray 實(shí)例。  
             Image image  = Toolkit.getDefaultToolkit().getImage("newrobot1_256.png");  
             PopupMenu popupMenu = new PopupMenu();   
               
             MenuItem  exitItem  = new MenuItem("exit");  
             System.out.println(exitItem.getFont());  
             MenuItem  menuItema  = new MenuItem("menu a");   
             MenuItem  menuItemb = new MenuItem("menu b");   
             MenuItem  menuItemc  = new MenuItem("menu c");   
             MenuItem  menuItemd = new MenuItem("menu d");   
             exitItem.addActionListener(new  ActionListener(){  
                 public void actionPerformed(ActionEvent e)     {     
                     try{       
                          System.exit(0);       
                       }catch(Exception   ex)   {     
                           ex.printStackTrace();     
                       }     
                 }  
             });        
             popupMenu.add(menuItema);   
             popupMenu.add(menuItemb);   
             popupMenu.add(menuItemc);   
             popupMenu.add(menuItemd);   
             popupMenu.add(exitItem);    
             trayIcon = new TrayIcon(image, "系統(tǒng)托盤{thu}",  popupMenu);     
             trayIcon.addMouseListener(new java.awt.event.MouseAdapter(){  
                @Override 
                public void mouseClicked(MouseEvent e) {  
                   if(e.getClickCount()==2){     
                         
                       //注意下面的API調(diào)用，這個(gè)可以給用戶提示信息  
                       trayIcon.displayMessage("message", "double click",   
                               TrayIcon.MessageType.INFO);  
                       showIT(true);     
                    }  
                }       
             });  
               
             //注意下面這個(gè)API調(diào)用，能夠保證使用的圖標(biāo)被縮放到合適的比例  
             trayIcon.setImageAutoSize(true);  
              
               
             try{     
                  tray.add(trayIcon);  // 將 TrayIcon 添加到 SystemTray。   
             } catch   (AWTException   e)     {     
                  System.err.println(e);     
             }  
        }else{  
            System.out.println("你的系統(tǒng)不支持系統(tǒng)托盤");  
        }  
          
        //下面這個(gè)部分是具體的業(yè)務(wù)邏輯  
        ImageIcon icon = new ImageIcon();  
        try{  
            URL url = new URL("newrobot1_256.png");  
            icon = new ImageIcon(url);  
        }catch(Exception e){  
              
        }      
        JLabel label = new JLabel();  
        label.setIcon(icon);  
        this.add(label);  
    }  
    public void showIT(boolean visable){  
        if(this.isVisible() != visable)  
            this.setVisible(visable);  
    }  
    public static void main(String[] args) {  
        javax.swing.SwingUtilities.invokeLater(new Runnable(){  
            public void run(){  
                new SystemTrayDemo().setVisible(true);  
            }  
        });  
    }  
} 

【效果圖】

原文鏈接：http://www.oschina.net/code/snippet_188162_8173

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