readserverfile.java

文本显示的演示例子

import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;

public class ReadServerFile extends JFrame {
   private JTextField enterField;
   private JEditorPane contentsArea;
   
   public ReadServerFile()
   {
      super( "Simple Web Browser" );

      Container container = getContentPane();
      
      enterField = new JTextField( "Enter file URL here" );
      enterField.addActionListener(
         new ActionListener() {

            
            public void actionPerformed( ActionEvent event )
            {
               getThePage( event.getActionCommand() );
            }

         } 

      ); 

      container.add( enterField, BorderLayout.NORTH );      
      contentsArea = new JEditorPane();
      contentsArea.setEditable( false );
      contentsArea.addHyperlinkListener(
         new HyperlinkListener() {            
            public void hyperlinkUpdate( HyperlinkEvent event )
            {
               if ( event.getEventType() == 
                    HyperlinkEvent.EventType.ACTIVATED )
                  getThePage( event.getURL().toString() );
            }

         } 

      ); 
      container.add( new JScrollPane( contentsArea ), 
         BorderLayout.CENTER );
      setSize( 400, 300 );
      setVisible( true );

   } 
  
   private void getThePage( String location )
   {
      
      try {
         contentsArea.setPage( location );
         enterField.setText( location );
      }
      catch ( IOException ioException ) {
         JOptionPane.showMessageDialog( this, 
            "Error retrieving specified URL", "Bad URL", 
            JOptionPane.ERROR_MESSAGE );
      }

   } 

   public static void main( String args[] )
   {
      ReadServerFile application = new ReadServerFile();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

}