/** * Title:        Java網絡編程演示 * Description:  Java網絡編程演示，用于北京師范大學計算機系Java課程教學示范。 * Copyright:    Copyright (c) 2001 * Company:      北京師范大學計算機系 * @author 孫一林 * @version 1.0 */import java.net.*;import java.io.*;import java.awt.*;import java.awt.image.*;import java.awt.event.*;public class getURLImage extends Frame{private Image img; public void paint(Graphics g)  {g.drawImage(img,20,20,this);  }public void processWindowEvent(WindowEvent e) {super.processWindowEvent(e);  if(e.getID()==WindowEvent.WINDOW_CLOSING)         System.exit(0);  } public static void main(String args[]) throws MalformedURLException,IOException  {if(args.length!=1)      {System.out.println("Usage:java URLTest3<imageurl>");       System.exit(-1);      }   URL url=new URL(args[0]);   getURLImage urlt= new getURLImage();   urlt.img=urlt.createImage((ImageProducer)url.getContent());   urlt.enableEvents(AWTEvent.WINDOW_EVENT_MASK);   urlt.setSize(300,300);   urlt.setVisible(true);  }}