SWUST--Java实验(八) 网络编程

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import javax.swing.JTextField;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.JButton;

public class MyURL extends JFrame {

	private JPanel contentPane;
	private static JTextField jf;
	static JTextArea jta;

	/**
	 * Launch the application.
	 * 
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		new MyURL();

	}

	/**
	 * Create the frame.
	 */
	public MyURL() {
		setTitle("URL\u7A0B\u5E8F");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 293, 353);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		JLabel lblNewLabel = new JLabel("URL\u8DEF\u5F84:");
		lblNewLabel.setFont(new Font("幼圆", Font.PLAIN, 18));
		lblNewLabel.setBounds(10, 21, 73, 26);
		contentPane.add(lblNewLabel);

		jf = new JTextField();
		jf.setFont(new Font("微软雅黑", Font.PLAIN, 16));
		jf.setBounds(10, 57, 257, 33);
		contentPane.add(jf);
		jf.setColumns(10);

		JPanel panel = new JPanel();
		panel.setBounds(10, 123, 257, 192);
		contentPane.add(panel);
		panel.setLayout(new BorderLayout(0, 0));

		JScrollPane scrollPane = new JScrollPane();
		panel.add(scrollPane, BorderLayout.CENTER);

		jta = new JTextArea();
		jta.setLineWrap(true);
		jta.setEditable(false);
		scrollPane.setViewportView(jta);

		JLabel lblNewLabel_1 = new JLabel("HTML\u6E90\u7801:");
		lblNewLabel_1.setFont(new Font("宋体", Font.PLAIN, 14));
		lblNewLabel_1.setBounds(10, 91, 73, 33);
		contentPane.add(lblNewLabel_1);

		JButton bt = new JButton("\u83B7\u53D6");
		bt.setFont(new Font("宋体", Font.PLAIN, 14));
		bt.setBounds(171, 22, 81, 26);
		contentPane.add(bt);
		
		bt.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				try {
					URL url = new URL(jf.getText());
					URLConnection ulc = url.openConnection();
					HttpURLConnection huc = (HttpURLConnection) ulc;//可加可不加
					int responseCode = huc.getResponseCode();
					if (responseCode == HttpURLConnection.HTTP_OK) {
						System.err.println("成功");
						FileWriter fos = new FileWriter("D:\\index.html");
						BufferedReader br = new BufferedReader(new InputStreamReader(huc.getInputStream()));
						String str = null;
						while ((str = br.readLine()) != null) {
							jta.append(str+'\n');
							fos.write(str+'\n');
						}
										
						fos.close();
						br.close();
						huc.disconnect();
					}else {
						System.err.println("失败!");
					}					
				} catch (MalformedURLException e1) {
					e1.printStackTrace();
				} catch (IOException e1) {
					e1.printStackTrace();
				}		
			}
		});
				
		setVisible(true);
	}
}