import java.io.*;
import java.net.*;
import java.awt.event.*;
import java.util.*;
import java.util.regex.*;

public class Spider {

	public static Vector filelist = new Vector();	//a list of visited files, so we don't re-parse
	private static String inputFile = "http://google.com";

	
	public static void main(String argv[]){
		Vector uris = new Vector(); //this is a list of URIs to parse
		uris.add(inputFile);
	
		while (uris.size() > 0) {		
			String url = (String) uris.remove(0);
			System.out.println(url);
			
			try {			
				BufferedReader reader = new BufferedReader( new InputStreamReader( new URL(url).openStream()));
				String line = reader.readLine();
				
				while (line != null) {
					Pattern p = Pattern.compile("http://[^\"\\s]+");
					Matcher m = p.matcher(line);
					while ( m.find()) {
					  System.out.println("\t"+line.substring(m.start(),m.end() ));
					  uris.add(line.substring(m.start(),m.end() ));
					}
					line = reader.readLine(); 
				}
			} catch (Exception e ) {System.out.println(e);}
		}
	}
}