java 网络编程 页面下载源代码

DownPage.java

public class DownPage {
	public static void main(String[] args){
		pageDown gui = new pageDown();
		gui.setVisible(true);
	}
}


pageDown.java

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Desktop;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileFilter;
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.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class pageDown extends JFrame {
	public pageDown() {
		initComponents();
	}

	private void thisWindowClosing(WindowEvent e) {
		System.exit(0);
	}
	

	private void dwnldMouseClicked(MouseEvent e) {
		try {
			URL url = new URL("http://"+ urlField.getText());

			String lct = lcFile.getText();
			if(fileName.getText().equals("")){
				String  str = urlField.getText().substring(0, urlField.getText().indexOf("."));
				String name =null;
				if(str.equals("www")){
					String nameTmp  = urlField.getText().substring(urlField.getText().indexOf(".") + 1, urlField.getText().length());
					name = nameTmp.substring(0,nameTmp.indexOf("."));
				}else{
					name = str;
				}
				file = new File(lct + "\\" + name + ".html");
			}else{
				file = new File(lct + "\\" + fileName.getText() + ".html");
			}
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			BufferedReader down = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));
			BufferedWriter save = new BufferedWriter(new FileWriter(file));
			String line = null;
			while((line = down.readLine()) != null){
				save.write(line);
				save.newLine();
				save.flush();
			}
			connection.disconnect();
			save.close();
			 JOptionPane.showMessageDialog(this, "下载完成");
		} catch (MalformedURLException e1) {
			// TODO Auto-generated catch block
		} catch (IOException e1) {
			JOptionPane.showMessageDialog(this, "下载失败,请检查网络连接并验证网页地址的有效性");
			// TODO Auto-generated catch block
			
		}catch (IllegalArgumentException e1){
			JOptionPane.showMessageDialog(this, "请输入网页地址");
		} catch(StringIndexOutOfBoundsException e1){
			JOptionPane.showMessageDialog(this, "请检查你的网址是否有误");
		}

	}

	private void openMouseClicked(MouseEvent e) {
		// TODO add your code here
		try {
			if(file == null){
				JOptionPane.showMessageDialog(this, "请先下载文件");
				
			}else{
				Desktop.getDesktop().open(file);
			}
	           
	       } catch (IOException e1) {
	           // TODO Auto-generated catch block
	           e1.printStackTrace();
	       }catch (IllegalArgumentException e1){
				JOptionPane.showMessageDialog(this, "请先下载文件");
			}
	}

	private void openFileMouseClicked(MouseEvent e) {
		// TODO add your code here
		 JFileChooser jfChooser = new JFileChooser(lcFile.getText()); 
		    jfChooser.setDialogTitle("选择目标文件夹"); 
		    jfChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
		    jfChooser.showOpenDialog(this); 
		    File fileIn = jfChooser.getCurrentDirectory(); 
		    lcFile.setText(fileIn.toString());
	}

	private void initComponents() {
		dialogPane = new JPanel();
		contentPanel = new JPanel();
		label1 = new JLabel();
		label3 = new JLabel();
		urlField = new JTextField();
		label2 = new JLabel();
		lcFile = new JTextField();
		openFile = new JButton();
		label4 = new JLabel();
		fileName = new JTextField();
		label5 = new JLabel();
		buttonBar = new JPanel();
		dwnld = new JButton();
		open = new JButton();

		//======== this ========
		setResizable(false);
		setTitle("\u7f51\u9875\u4e0b\u8f7d\u5668");
		addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				thisWindowClosing(e);
			}
		});
		Container contentPane = getContentPane();
		contentPane.setLayout(new BorderLayout());

		//======== dialogPane ========
		{
			dialogPane.setBorder(new EmptyBorder(12, 12, 12, 12));
			dialogPane.setPreferredSize(new Dimension(400, 300));
			dialogPane.addPropertyChangeListener(new java.beans.PropertyChangeListener(){
				public void propertyChange(java.beans.PropertyChangeEvent e){
					if("border".equals(e.getPropertyName()))
						throw new RuntimeException();
					}
				});

			dialogPane.setLayout(new BorderLayout());

			//======== contentPanel ========
			{
				contentPanel.setPreferredSize(new Dimension(380, 30));
				contentPanel.setLayout(new FlowLayout(FlowLayout.LEFT));

				//---- label1 ----
				label1.setPreferredSize(new Dimension(360, 20));
				label1.setText("\u8bf7\u8f93\u5165\u76ee\u6807URL\uff1a");
				contentPanel.add(label1);

				//---- label3 ----
				label3.setText("http://");
				contentPanel.add(label3);

				//---- urlField ----
				urlField.setPreferredSize(new Dimension(300, 25));
				contentPanel.add(urlField);

				//---- label2 ----
				label2.setPreferredSize(new Dimension(360, 20));
				label2.setText("\u8bf7\u8f93\u5165\u5b58\u50a8\u76ee\u6807\u5730\u5740\uff1a");
				contentPanel.add(label2);

				//---- lcFile ----
				lcFile.setPreferredSize(new Dimension(300, 25));
				lcFile.setText("C:\\Users\\Administrator\\Downloads");
				contentPanel.add(lcFile);

				//---- openFile ----
				openFile.setText("...");
				openFile.addMouseListener(new MouseAdapter() {
					@Override
					public void mouseClicked(MouseEvent e) {
						openFileMouseClicked(e);
					}
				});
				contentPanel.add(openFile);

				//---- label4 ----
				label4.setText("\u5b58\u50a8\u4e3a\uff1a");
				contentPanel.add(label4);

				//---- fileName ----
				fileName.setPreferredSize(new Dimension(150, 25));
				contentPanel.add(fileName);

				//---- label5 ----
				label5.setText(".html");
				contentPanel.add(label5);
			}
			dialogPane.add(contentPanel, BorderLayout.CENTER);

			//======== buttonBar ========
			{
				buttonBar.setBorder(new EmptyBorder(12, 0, 0, 0));
				buttonBar.setLayout(new GridBagLayout());
				((GridBagLayout)buttonBar.getLayout()).columnWidths = new int[] {0, 85, 80};
				((GridBagLayout)buttonBar.getLayout()).columnWeights = new double[] {1.0, 0.0, 0.0};

				//---- dwnld ----
				dwnld.setText("\u4e0b\u8f7d");
				dwnld.addMouseListener(new MouseAdapter() {
					@Override
					public void mouseClicked(MouseEvent e) {
						dwnldMouseClicked(e);
					}
				});
				buttonBar.add(dwnld, new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0,
					GridBagConstraints.CENTER, GridBagConstraints.BOTH,
					new Insets(0, 0, 0, 5), 0, 0));

				//---- open ----
				open.setText("\u67e5\u770b");
				open.addMouseListener(new MouseAdapter() {
					@Override
					public void mouseClicked(MouseEvent e) {
						openMouseClicked(e);
					}
				});
				buttonBar.add(open, new GridBagConstraints(2, 0, 1, 1, 0.0, 0.0,
					GridBagConstraints.CENTER, GridBagConstraints.BOTH,
					new Insets(0, 0, 0, 0), 0, 0));
			}
			dialogPane.add(buttonBar, BorderLayout.SOUTH);
		}
		contentPane.add(dialogPane, BorderLayout.CENTER);
		pack();
		setLocationRelativeTo(getOwner());
		//GEN-END:initComponents
	}
	//GEN-BEGIN:variables
	private JPanel dialogPane;
	private JPanel contentPanel;
	private JLabel label1;
	private JLabel label3;
	private JTextField urlField;
	private JLabel label2;
	private JTextField lcFile;
	private JButton openFile;
	private JLabel label4;
	private JTextField fileName;
	private JLabel label5;
	private JPanel buttonBar;
	private JButton dwnld;
	private JButton open;
	private File file;//GEN-END:variables
}


 

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