/*  GetURL.java
 *
 *  This program uses the URL class to download the contents
 *  of a URL and copies them to a file or to the console.
 *
 *  Derived from "Java Examples in a Nutshell", O'Reilly, 1997.
 *
 *  Bruce M. Bolden
 *  April 22, 1998
 *  http://www.cs.uidaho.edu/~bruceb/
 */

import java.io.*;
import java.net.*;

public class GetURL
{
    public static void main( String[] args )
    {
        InputStream   in  = null;
        OutputStream  out = null;
        
        try
        {
              //  Check the arguments
            if( (args.length != 1) && (args.length != 2) )
            {
                throw new IllegalArgumentException(
                    "Wrong number of arguments" );
            }
              // Set up the streams
            URL url = new URL( args[0] );
            in = url.openStream();
            if( args.length == 2 )
                out = new FileOutputStream( args[1] );
            else
                out = System.out;
            
              //  Copy bytes from the URL to the output stream
            final int BUF_SIZE = 4096;
            byte[] buffer = new byte[BUF_SIZE];
            int bytesRead;
            
            while( (bytesRead = in.read(buffer)) != -1 )
                out.write( buffer, 0, bytesRead );
        }
        catch ( Exception e )
        {
            System.err.println( e );
            System.err.println( "Usage: java GetURL <URL> [<filename>]" );
        }
        finally
        {
            try {
                in.close();
                out.close();
            }
            catch ( Exception e )
            {  /* do nothing  */  } 
        }
    }
}