黑马程序员 最简单的浏览器

URL的全名叫做对统一资源定位符(Uniform  Resource Locator)的抽象，其实就好像现在中的身份证号一样的，可以通过这一串字符找到自己想要去找的地方；

URL url=new URL(www.baidu.com);创建一个百度的URL

Internet是用于获取主机信息

有两个实例方法

getHostName()用来获取InetAddress对象所含的域名。

gethostAddress()获取InetAddress对象的IP地址

//显示网络的文档内容

import java.awt.*;

import java.awt.event.*;

import java.net.*;

import java.io.*;

import javax.swing.JEditorPane;

public class Example11_2

{

         public static void main(String args[])

         {

                   new Win();

         }

}

class Win extends Frame implements ActionListener,Runnable

{

         Button button;

         URL url;

         TextField text;

         JEditorPane editpane;

         byte b[]=new byte[118];

         Thread thread;

         public Win()

         {

                   text=new TextField(20);

                   editpane=new JEditorPane();

                   editpane.setEditable(false);

                   button=new Button("确定");

                   button.addActionListener(this);

                   thread=new Thread(this);

                   Panel p=new Panel();

                   p.add(new Label("输入网址："));

                   p.add(text);

                   p.add(button);

                   ScrollPane scroll=new ScrollPane();

                   scroll.add(editpane);

                   add(scroll,BorderLayout.CENTER);

                   add(p,BorderLayout.NORTH);

                   setBounds(160,60,360,300);

                   setVisible(true);

                   validate();

                   addWindowListener(new WindowAdapter()

                                     {

                                               public void windowClosing(WindowEvent e)

                                               {

                                                        System.exit(0);

                                               }

                                     });

         }

         public void actionPerformed(ActionEvent e)

         {

                   if(!(thread.isAlive()))

                   {

                            thread=new Thread(this);

                            try{thread.start();}

                            catch(Exception ee)

                            {text.setText("我正在读取"+url);

                   }

                   }

         }

         public void run()

         {

                   try{

                            editpane.setText(null);

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

                            editpane.setPage(url);

                   }

                   catch(Exception e1)

                   {

                            text.setText(""+e1);

                            return;

                   }

         }

}

 

史上最差的模拟网页浏览器代码

import java.awt.*;

import java.awt.event.*;

import java.net.*;

import java.io.*;

import javax.swing.event.*;

import javax.swing.*;

public class Example11_3

{

         public static void main(String args[])

         {

                   new LinkWin();

         }

}

class LinkWin extends JFrame implements ActionListener,Runnable

{

         Button button;

         URL url;

         TextField text;

         JEditorPane editpane;

         byte b[]=new byte[118];

         Thread thread;

         public LinkWin()

         {

                   text=new TextField(20);

                   editpane=new JEditorPane();

                   editpane.setEditable(false);

                   button=new Button("确定");

                   button.addActionListener(this);

                   thread=new Thread(this);

                   Panel p=new Panel();

                   p.add(new Label("输入网址"));

                   p.add(text);

                   p.add(button);

                   ScrollPane scroll=new ScrollPane();

                   scroll.add(editpane);

                   add(scroll,BorderLayout.CENTER);

                   add(p,BorderLayout.NORTH);

                   setBounds(60,60,360,300);

                   setVisible(true);

                   validate();

                   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                   editpane.addHyperlinkListener(new HyperlinkListener()

                                     {

                                               public void hyperlinkUpdate(HyperlinkEvent e)

                                               {

                                                                 if(e.getEventType()==HyperlinkEvent.EventType.ACTIVATED)

                                                                 {

                                                                           try{

                                                                                    editpane.setPage(e.getURL());

                                                                           }catch(IOException e1)

                                                                           {

                                                                                    editpane.setText(""+e1);

                                                                           }

                                                                 }

                                               }

                                     });

         }

         public void actionPerformed(ActionEvent e)

         {

                   if(!(thread.isAlive()))

                            thread=new Thread(this);

                   try{thread.start();}catch(Exception ee){text.setText("我正在读取"+url);}

         }

         public void run()

         {

                   try{

                            editpane.setText(null);

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

                            editpane.setPage(url);

                   }catch(Exception e1)

                   {

                            text.setText(""+e1);

                            return;

                   }

         }

}