＜Java＞ JVA307-簡易瀏覽器

這真的是一個很簡易的瀏覽器...


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.UIManager;
import javax.swing.plaf.metal.MetalLookAndFeel;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import java.io.*;
import java.net.*;

public class JVA307 extends JFrame implements HyperlinkListener {
   JTextField jURL = new JTextField();
   JEditorPane htmlPane = new JEditorPane();

  // Main method
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    }
    catch(Exception e) {
      e.printStackTrace();
    }

    new JVA307();
  }

  // 建構函式
  public JVA307() {
    super("簡易Web Browser瀏覽器");

    Container contentPane = getContentPane();
    contentPane.setLayout(new BorderLayout());

      JLabel jlabel1 = new JLabel();
    jlabel1.setText("URL:");
//////////////////////////////////////////////////////////
    jURL.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
            String url = jURL.getText();
            showHTML(url);
      }
    });
////////////////////////////////////////////////////////
   // JEditorPane
   htmlPane.setEditable(false);
   htmlPane.addHyperlinkListener(this);
//////////////////////////////////////////////////////////

      JPanel jpanel1 = new JPanel();
    jpanel1.setLayout(new BorderLayout());
    jpanel1.setPreferredSize(new Dimension(10, 35));

      JPanel jpanel2 = new JPanel();
    jpanel2.setBorder(BorderFactory.createEmptyBorder(0,5,0,0));
    jpanel2.setPreferredSize(new Dimension(35, 10));

      JPanel jpanel3 = new JPanel();
    jpanel3.setLayout(new BorderLayout());
    jpanel3.setBorder(BorderFactory.createEmptyBorder(5,0,5,5));

    jpanel2.add(jlabel1);
    jpanel1.add(jpanel2, BorderLayout.WEST);
    jpanel3.add(jURL);
    jpanel1.add(jpanel3, BorderLayout.CENTER);
    contentPane.add(jpanel1, BorderLayout.NORTH);

   ///////////////////////////////////////////////////
      // 捲軸

   JScrollPane jscrollpane = new JScrollPane(htmlPane,20,30);
   contentPane.add(jscrollpane,BorderLayout.CENTER);

   ///////////////////////////////////////////////////

    // Center the frame
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = this.getSize();
    if (frameSize.height > screenSize.height)
      frameSize.height = screenSize.height;
    if (frameSize.width > screenSize.width)
      frameSize.width = screenSize.width;
    this.setLocation((screenSize.width - frameSize.width)  2, (screenSize.height - frameSize.height)  2);

    this.validate();
    this.setSize(new Dimension(250, 250));
    this.setVisible(true);

      this.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
            System.exit(0);
         }
      }); 
  }

  // 處理超連結事件

  void showHTML(String url) {
      try {
         if (url.length() > 0) {
            if (!url.startsWith("http://") && !url.startsWith("file:/")) {
               if (url.indexOf(':') == 1) {
                  url = "file:/" + url;
               }
               else {
                  url = "http://" + url;
               }
            }
            //////////////////////////////
            URL url1 = new URL(url);
            htmlPane.setPage(url1);         //
            jURL.setText(url);
            jURL.select(0,url.length());
            /////////////////////////////

         }
      }
      catch (java.net.MalformedURLException muex) {
         JOptionPane.showMessageDialog(this, muex.toString() + ": " + url,
         "Error", JOptionPane.ERROR_MESSAGE);
      }
      catch (Exception ex){
         JOptionPane.showMessageDialog(this, ex.toString() + ": " + url,
         "Error", JOptionPane.ERROR_MESSAGE);
      }
  }
  ////////////////////////////////////////////////
  public void hyperlinkUpdate(HyperlinkEvent he){

   if(he.getEventType() == HyperlinkEvent.EventType.ACTIVATED){   //
         String s = he.getURL().toString().trim();
      showHTML(s);
   }
  }
  //////////////////////////////////////////////////
}

相關物件說明：
URL
Dimension

參考網站：
Java A+