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

巴特西

Java中的两个类：Desktop和SystemTray

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