Java中的两个类：Desktop和SystemTray

在JDK6中 ,AWT新增加了两个类:Desktop和SystemTray,前者可以用来打开系统默认浏览器浏览指定的URL,打开系统默认邮件客户端给指定的邮箱发邮件,用默认应用程序打开或编辑文件(比如,用记事本打开以txt为后缀名的文件),用系统默认的打印机打印文档;后者可以用来在系统托盘区创建一个托盘程序.下面代码演示了Desktop和SystemTray的用法.

/**
 *
 * @author chinajash
 */
public class DesktopTray {
    private static Desktop desktop;
    private static SystemTray st;
    private static PopupMenu pm;
    public static void main(String[] args) {
        if(Desktop.isDesktopSupported()){//判断当前平台是否支持Desktop类
            desktop = Desktop.getDesktop();
        }
        if(SystemTray.isSupported()){//判断当前平台是否支持系统托盘
            st = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("netbeans.png");//定义托盘图标的图片            
            createPopupMenu();
            TrayIcon ti = new TrayIcon(image, "Desktop Demo Tray", pm);
            try {
                st.add(ti);
            } catch (AWTException ex) {
                ex.printStackTrace();
            }
        }
    }
    
    public static void sendMail(String mail){
        if(desktop!=null && desktop.isSupported(Desktop.Action.MAIL)){
            try {
                desktop.mail(new URI(mail));
            } catch (IOException ex) {
                ex.printStackTrace();
            } catch (URISyntaxException ex) {
                ex.printStackTrace();
            }
        }            
    }
    
    public static void  openBrowser(String url){
        if(desktop!=null && desktop.isSupported(Desktop.Action.BROWSE)){
            try {
                desktop.browse(new URI(url));
            } catch (IOException ex) {
                ex.printStackTrace();
            } catch (URISyntaxException ex) {
                ex.printStackTrace();
            }
        }
    }
    
    public static void  edit(){
        if(desktop!=null && desktop.isSupported(Desktop.Action.EDIT)){
            try {
                File txtFile = new File("test.txt");
                if(!txtFile.exists()){
                    txtFile.createNewFile();
                }
                desktop.edit(txtFile);
            } catch (IOException ex) {
                ex.printStackTrace();
            } 
        }
    }
    
    public static void createPopupMenu(){
       pm = new PopupMenu();
        MenuItem openBrowser = new MenuItem("Open My Blog");
        openBrowser.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                openBrowser("http://blog.csdn.net/chinajash");
            }
        });
        
        MenuItem sendMail = new MenuItem("Send Mail to me");
        sendMail.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                sendMail("mailto:chinajash@yahoo.com.cn");
            }
        });
        
        MenuItem edit = new MenuItem("Edit Text File");
        sendMail.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                edit();
            }
        });
        
        MenuItem exitMenu = new MenuItem("&Exit");
        exitMenu.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        pm.add(openBrowser);
        pm.add(sendMail);
        pm.add(edit);
        pm.addSeparator();
        pm.add(exitMenu);    
    }
} 

如果在Windows中运行该程序,可以看到在系统托盘区有一个图标,右击该图标会弹出一个菜单,点击Open My Blog会打开IE,并浏览"http://blog.csdn.net/chinajash";点击Send Mail to me会打开Outlook Express给我发邮件;点击Edit Text File会打开记事本编辑在程序中创建的文件test.txt