JavaAWT|桌面类

原文:https://www.geeksforgeeks.org/java-awt-desktop-class/

桌面类是 Java AWT 包的一部分。此类用于启动在本机桌面上注册的相关应用程序，以处理一个 URI 或一个文件。

关于桌面类的要点:

• 它可以打开一个默认的网络浏览器，显示一个特定的 URI


• 它可以启动默认邮件客户端，可选邮件到 URI


• 它可以启动注册的应用程序来打开、编辑或打印特定的文件。

桌面类中的不同方法

下面的程序说明了 Java AWT 中的桌面类:

• Program to Launch the browser and open a specific URI

  ```java
  // 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:




• Program to Launch the mail to a specific URI

  ```java
  // 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:




• Program to open a file

  ```java
  // 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:
  




• Program to open a file for editing

  ```java
  // 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:




• Program to open a file for printing

  ```java
  // 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://docs . Oracle . com/javase/7/docs/API/Java/awt/desktop . html