JAVA获取网页源码

package ex30;



import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.net.*;

import javax.swing.*;



public class ViewRemoteFile extends JApplet{

	// Button to view the file

	private JButton jbtView = new JButton("View");

	

	// Text field to receive file name

	private JTextField jtfURL = new JTextField(12);

	

	// Text area to store file

	private JTextArea jtaFile = new JTextArea();

	

	// Label to display status

	private JLabel jlblStatus = new JLabel();

	

	/** Initialize the applet */

	public void init(){

		// Create a panel to hold a label, a text field, and a button

		JPanel p1 = new JPanel();

		p1.setLayout(new BorderLayout());

		p1.add(new JLabel("Filename"), BorderLayout.WEST);

		p1.add(jtfURL, BorderLayout.CENTER);

		p1.add(jbtView, BorderLayout.EAST);

		

		// Place text area and panel p to the applet

		setLayout(new BorderLayout());

		add(new JScrollPane(jtaFile), BorderLayout.CENTER);

		add(p1, BorderLayout.NORTH);

		add(jlblStatus, BorderLayout.SOUTH);

		

		// Register listener to handle the "View" button

		jbtView.addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent e){

				showFile();

			}

		});

	}

	

	private void showFile(){

		java.util.Scanner input = null;  // Use Scanner for text input

		URL url = null;

		

		try{

			// Obtain URL from the text field

			url = new URL(jtfURL.getText().trim());

			

			// Create a Scanner for input stream

			input = new java.util.Scanner(url.openStream());

			

			// Read a line and append the line to the text area

			while(input.hasNext()){

				jtaFile.append(input.nextLine() + "\n");

			}

			

			jlblStatus.setText("File loaded successfully");

		}

		catch(MalformedURLException ex){

			jlblStatus.setText("URL " + url + " not found");

		}

		catch(IOException e){

			jlblStatus.setText(e.getMessage());

		}

		finally{

			if(input != null)  input.close();

		}

	}

	

}