JAva urlアドレス接尾辞名の取得

final static Pattern pattern = Pattern.compile("\\S*[?]\\S*");

/**
     *         
     * @return
     */
    private static String parseSuffix(String url) {

        Matcher matcher = pattern.matcher(url);

        String[] spUrl = url.toString().split("/");
        int len = spUrl.length;
        String endUrl = spUrl[len - 1];

        if(matcher.find()) {
            String[] spEndUrl = endUrl.split("\\?");
            return spEndUrl[0].split("\\.")[1];
        }
        return endUrl.split("\\.")[1];
    }

/**
	 *         
	 * @return
	 */
	public static String parseSuffix(String strUrl) {
		BufferedInputStream bis = null;
		HttpURLConnection urlConnection = null;
                URL url = null;		

		try {
			url = new URL(strUrl);
			urlConnection = (HttpURLConnection) url.openConnection();
			urlConnection.connect();
			
			bis = new BufferedInputStream(urlConnection.getInputStream());
			
			return HttpURLConnection.guessContentTypeFromStream(bis);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}