example11_1.java

不错的教程 适合中高级人员的使用

import java.applet.*;import java.awt.*;import java.io.*;
import java.awt.event.*;import java.net.*;
 class MyWin extends Frame implements ActionListener,Runnable
{  Button button;
   URL url;
   TextField text;
   TextArea area;
   byte b[]=new byte[118];
   Thread thread;
   public void init()	   
   {  text=new TextField(20);
      area=new TextArea(12,12);
      button=new Button("确定");
	  thread=new Thread(this);
	  Panel p=new Panel();
      p.add(new Label("输入网址:"));p.add(text); p.add(button);
     button.addActionListener(this);
	 add(area,BorderLayout.CENTER);add(p,BorderLayout.NORTH);
	 setBounds(60,60,360,360);
	 setVisible(true);
	 validate();
   }
   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{int n=-1;
	       area.setText(null);
		   url=new URL(text.getText().trim());
		   InputStream in=url.openStream();
		   while((n=in.read(b))!=-1)
		   {
			   String s=new String(b,0,n);
			   area.append(s);
		   }
	   }
		   catch(MalformedURLException el)
		   {
			   text.setText(""+el);
			   return;
		   }
		   catch(IOException e1)
		   {
			   text.setText(""+e1);
			   return;
		   }
	   }
   }
   
public class Example11_1 
{
	public static void main(String args[])
	{
		new MyWin();
	}
}