JFavicon

JFavicon is a simple library for finding the URLs of favicons.

The correct way for a page to define its favicon is with a link element in the head. However, not all pages do this, so if there are no link elements, the root is checked for files like favicon.ico (see Source for which extensions are checked).

new FaviconLoader().getFavicons("http://www.wikipedia.com", new FaviconCallback() {
  @Override public void onFaviconsLoaded(Set<URL> favicons) {
    for (URL fav : favicons) {
      System.out.println(fav);
    }
  }
});

Javadoc: http://www.zachklipp.com/jfavicon/javadoc/