import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class WebLength
{
public static void main(String args[]) throws Exception {
URL url = new URL("http://www.exemple.com");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
int taille_oct = conn.getContentLength();
if (taille_oct>=0)
System.out.println("Content-Length: " + taille_oct);
}
}