import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;

public class Recurs {

    // Funció que valida si un recurs està en format GIF
    boolean isGifFormat(URL url) {
        boolean ret = false;
        try {
            URLConnection con = url.openConnection();
            String headerType = con.getContentType();
            String guessType = con.guessContentTypeFromName(url.
                    getFile());
            ret = headerType.endsWith("gif") || guessType.endsWith("gif");
        } catch (IOException ex) {
            System.err.println(ex);
        }
        return ret;
    }

    // Funció que descarrega i mostra per pantalla el contingut d'un recurs
    private void printContent(URL url) {
        InputStream in;
        char[] cbuf = new char[512];
        int caractersLlegits;

        if (!isGifFormat(url)) {
            return;
        }

        try {
            in = url.openStream();
            InputStreamReader inr = new InputStreamReader(in);
            while ((caractersLlegits = inr.read(cbuf)) != -1) {
                String str = String.copyValueOf(cbuf, 0, caractersLlegits);
                System.out.print(str);
            }
            System.out.println();
        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}