JDK6.0新特性二:Desktop和SystemTray类

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:[email protected]");
  }
 });

 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,并浏览我设定的BLOG地址;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。

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