import java.io.*;import java.net.*;/** * Example program from Chapter 2 * Programming Spiders, Bots and Aggregators in Java * Copyright 2001 by Jeff Heaton * * This program uses the standard Java URL class to open a * connection to a web page and download the contents. * * @author Jeff Heaton * @version 1.0 */class GetURL{  /**   * This method will display the URL specified by the parameter.   *   * @param u The URL to display.   */  static protected void getURL(String u)  {    URL url;    InputStream is;    InputStreamReader isr;    BufferedReader r;    String str;    try    {      System.out.println("Reading URL: " + u );      url = new URL(u);      is = url.openStream();      isr = new InputStreamReader(is);      r = new BufferedReader(isr);      do      {        str = r.readLine();        if(str!=null)          System.out.println( str );      } while( str!= null );    }    catch(MalformedURLException e)    {      System.out.println("Must enter a valid URL");    }    catch(IOException e)    {      System.out.println("Can't connect");    }  }  /**   * Program entry point.   *   * @param args Command line arguments.  Specified the URL to download.   */  static public void main(String args[])  {    if( args.length<1)      System.out.println("Usage: GetURL ");    else      getURL( args[0] );  }}