JDK6的新特性之一:Desktop類和SystemTray類

在JDK6中 ,AWT新增加了兩個類:Desktop和SystemTray,前者可以用來開啟系統預設瀏覽器瀏覽指定的URL,開啟系統預設郵件用戶端給指定的郵箱發郵件,用預設應用程式開啟或編輯檔案(比如,用記事本開啟以txt為尾碼名的檔案),用系統預設的印表機列印文檔;後者可以用來在系統托盤區建立一個托盤程式.下面代碼示範了Desktop和SystemTray的用法.

/**
 *
 * @author chinajash
 */
import java.awt.Desktop;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.Toolkit;
import java.awt.Image;
import java.awt.PopupMenu;
import java.awt.Menu;
import java.awt.MenuItem;
import java.awt.AWTException;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class DesktopTray {
    private static Desktop desktop;
    private static SystemTray st;
    private static PopupMenu pm;
    public static void main(String[] args) {
        if(Desktop.isDesktopSupported()){//判斷當前平台是否支援Desktop類
            desktop = Desktop.getDesktop();
        }
        if(SystemTray.isSupported()){//判斷當前平台是否支援系統托盤
            st = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("netbeans.png");//定義托盤表徵圖的圖片            
            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中運行該程式,可以看到在系統托盤區有一個表徵圖,右擊該表徵圖會彈出一個菜單,點擊Open My Blog會開啟IE,並瀏覽"http://blog.csdn.net/chinajash";點擊Send Mail to me會開啟Outlook Express給我發郵件;點擊Edit Text File會開啟記事本編輯在程式中建立的檔案test.txt