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📜  Java AWT |桌面类

📅  最后修改于: 2022-05-13 01:55:00.985000             🧑  作者: Mango

Java AWT |桌面类

Desktop 类是Java AWT 包的一部分。此类用于启动在本机桌面上注册的关联应用程序以处理 URI 或文件。

关于桌面类的要点：

  • 它可以打开显示特定 URI 的默认 Web 浏览器
  • 它可以使用可选的 mailto URI 启动默认邮件客户端
  • 它可以启动已注册的应用程序来打开、编辑或打印特定文件。

桌面类中的不同方法

MethodExplanation
browse(URI u)Launches the default browser to display a specific URI.
edit(File f)Launches the associated editor application and opens a file.
getDesktop()Returns the Desktop instance of the current browser context.
isDesktopSupported()returns whether this class is supported on the current platform.
isSupported(Desktop.Action action)returns whether an action is supported on the current platform.
mail()Launches the mail composing window of the user default mail client.
mail(URI mailtoURI)Launches the mail composing window of the user default mail client, filling the message fields specified by a mailto: URI.
open(File f)Launches the associated application to open the file
print(File f)Prints a file with the native desktop printing facility, using the associated application’s print command.

下面的程序说明了Java AWT 中的 Desktop 类：

  • 启动浏览器并打开特定 URI 的程序
    // Java Program to Launch the browser
// and open a specific URI
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
  
class desk extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
      
    // Main Method 
    public static void main(String args[])
    {
        desk d = new desk();
  
        // create a frame
        f = new JFrame("desktop");
  
        // create a panel
        JPanel p = new JPanel();
  
        // create a button
        JButton b = new JButton("launch");
  
        // add Action Listener
        b.addActionListener(d);
  
        p.add(b);
        f.add(p);
        f.show();
        f.setSize(200, 200);
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        try {
  
            // create a URI
            URI u = new URI("www.geeksforgeeks.org");
  
            Desktop d = Desktop.getDesktop();
            d.browse(u);
        }
        catch (Exception evt) {
        }
    }
}

    输出 ：

  • 将邮件发送到特定 URI 的程序
    // Java Program to Launch the
// mail to a specific URI
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
  
class desk extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
  
    // Main Method
    public static void main(String args[])
    {
        desk d = new desk();
  
        // create a frame
        f = new JFrame("desktop");
  
        // create a panel
        JPanel p = new JPanel();
  
        // create a button
        JButton b = new JButton("launch");
  
        // add Action Listener
        b.addActionListener(d);
  
        p.add(b);
        f.add(p);
        f.show();
        f.setSize(200, 200);
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        try {
            URI u = new URI("mailto:contribute@geeksforgeeks.org");
  
            Desktop d = Desktop.getDesktop();
            d.mail(u);
        }
        catch (Exception evt) {
            JOptionPane.showMessageDialog(this, evt.getMessage());
        }
    }
}

    输出：

  • 打开文件的程序
    // Java Program to open a file
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
class desk extends JFrame implements ActionListener {
    // frame
    static JFrame f;
       
    // Main Method
    public static void main(String args[])
    {
        desk d = new desk();
  
        // create a frame
        f = new JFrame("desktop");
  
        // create a panel
        JPanel p = new JPanel();
  
        // create a button
        JButton b = new JButton("launch");
  
        // add Action Listener
        b.addActionListener(d);
  
        p.add(b);
        f.add(p);
        f.show();
        f.setSize(200, 200);
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        try {
  
            // create a file
            File u = new File("f:\\image.png");
  
            Desktop d = Desktop.getDesktop();
            d.open(u);
        }
        catch (Exception evt) {
            JOptionPane.showMessageDialog(this, evt.getMessage());
        }
    }
}

    输出 ：

  • 打开文件进行编辑的程序
    // Java Program to open a file for editing
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
  
class desk extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
  
    // Main Method
    public static void main(String args[])
    {
        desk d = new desk();
  
        // create a frame
        f = new JFrame("desktop");
  
        // create a panel
        JPanel p = new JPanel();
  
        // create a button
        JButton b = new JButton("launch");
  
        // add Action Listener
        b.addActionListener(d);
  
        p.add(b);
        f.add(p);
        f.show();
        f.setSize(200, 200);
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        try {
  
            // create a file
            File u = new File("f:\\sample.txt");
  
            Desktop d = Desktop.getDesktop();
            d.edit(u);
        }
        catch (Exception evt) {
            JOptionPane.showMessageDialog(this, evt.getMessage());
        }
    }
}

    输出 ：

  • 打开文件进行打印的程序
    // Java Program to open a file for printing
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
  
class desk extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
  
    // Main Method
    public static void main(String args[])
    {
        desk d = new desk();
  
        // create a frame
        f = new JFrame("desktop");
  
        // create a panel
        JPanel p = new JPanel();
  
        // create a button
        JButton b = new JButton("launch");
  
        // add Action Listener
        b.addActionListener(d);
  
        p.add(b);
        f.add(p);
        f.show();
        f.setSize(200, 200);
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        try {
  
            // create a file
            File u = new File("f:\\sample.txt");
  
            Desktop d = Desktop.getDesktop();
            d.print(u);
        }
        catch (Exception evt) {
            JOptionPane.showMessageDialog(this, evt.getMessage());
        }
    }
}

    输出 ：

参考： https: Java/awt/Desktop.html