java URL例子

demo1打印url網頁信息

package xunfang.com.web;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

/**
 * @description 打印url網頁信息
 */
public class WebBroswer2 {
	public static void main(String[] args) {
		try {
			String urlString = "http://www.baidu.com";
			InputStreamReader in = new InputStreamReader(
					new URL(urlString).openStream());
			StringBuffer input = new StringBuffer();
			int ch;
			while ((ch = in.read()) != -1)
				input.append((char) ch);
			String patternString = "<a\\s+href\\s*=\\s*(\"[^\"]*\"|[^\\s>]|\"[^\"]*\"\\s*+[^>\"]*\\s*=\\s*(\"[^\"]*\"|[^\\s>]))\\s*>";
			Pattern pattern = Pattern.compile(patternString,
					Pattern.CASE_INSENSITIVE);
			Matcher matcher = pattern.matcher(input);
			int i = 0;
			while (matcher.find()) {
				int start = matcher.start();
				int end = matcher.end();
				String match = input.substring(start, end);
				System.out.println(++i + " : " + match);
			}
		} catch (IOException exception) {
			exception.printStackTrace();
		} catch (PatternSyntaxException exception) {
			exception.printStackTrace();
		}
	}
}

demo2輸入url打開網頁（會藍屏，排版有問題）

package xunfang.com.web;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.URL;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
/**
 * @description	輸入url打開網頁
 * @author smalt
 *
 */
public class Web2 extends JFrame implements ActionListener, Runnable {

	private static final long serialVersionUID = 1L;
	JButton button;
	URL url;
	JTextField text;
	JEditorPane editPane;
	byte b[] = new byte[118];
	Thread thread;

	public Web2() {
		text = new JTextField("http://", 20);
		editPane = new JEditorPane();
		editPane.setEditable(false);
		button = new JButton("確定");
		button.addActionListener(this);
		thread = new Thread(this);
		JPanel p = new JPanel();
		p.add(new JLabel("輸入網址"));
		p.add(text);
		p.add(button);
		JScrollPane scroll = new JScrollPane(editPane);
		add(scroll, BorderLayout.CENTER);
		add(p, BorderLayout.NORTH);
		setBounds(160, 60, 420, 300);
		setVisible(true);
		validate();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 設計窗口
		editPane.addHyperlinkListener(new HyperlinkListener() {
			public void hyperlinkUpdate(HyperlinkEvent e) {
				if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
					try {
						editPane.setPage(e.getURL());
					} catch (IOException el) {
					}
				}
			}
		});// 處理超級鏈接
	}

	public void actionPerformed(ActionEvent e) {
		if (!(thread.isAlive()))
			thread = new Thread(this);
		try {
			thread.start();
		} catch (Exception ee) {
			text.setText("我正在讀取" + url);
		}
	}

	public void run() {
		try {
			editPane.setText(null);
			url = new URL(text.getText().trim());
			editPane.setPage(url);// 打開頁面
		} catch (Exception el) {
			text.setText("" + el);
			return;
		}
	}

	public static void main(String[] args) {
		Web2 application = new Web2();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

demo3調用系統瀏覽器打開網頁並截屏（有bug）

package xunfang.com.web;

import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URI;

import javax.imageio.ImageIO;
//調用系統瀏覽器打開url地址並截屏
public class Web3 {
	public static void main(String[] args) {
		if (!java.awt.Desktop.isDesktopSupported()) {
			System.err.println("Desktop is not supported (fatal)");
			System.exit(1);
		}

		java.awt.Desktop desktop = java.awt.Desktop.getDesktop();
		if (!desktop.isSupported(java.awt.Desktop.Action.BROWSE)) {
			System.err
					.println("Desktop doesn't support the browse action (fatal)");
			System.exit(1);
		}

		try {
			URI uri = URI.create("http://www.baidu.com");
			desktop.browse(uri);
			Thread.sleep(8000); // 8 seconds is enough to load the any page.
			Robot robot = new Robot();
			// Rectangle rectangle = new
			// Rectangle(Toolkit.getDefaultToolkit().getScreenSize() );
			Rectangle rectangle = new Rectangle(300, 90, 1000, 720);
			BufferedImage image = robot.createScreenCapture(rectangle);
			File outputfile = new File("D:\\aa\\test.jpg");
			ImageIO.write(image, "jpg", outputfile);
		} catch (IOException e) {
			e.printStackTrace();
		} catch (AWTException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}