public static List<PostalCode> postalCodeSearch(String postalCode,
			String placeName, String countryCode) throws Exception {
		List<PostalCode> postalCodes = new ArrayList<PostalCode>();

		String url = "http://ws.geonames.org/postalCodeSearch?";
		if (postalCode != null) {
			url = url + "postalcode=" + postalCode;
		}
		if (placeName != null) {
			if (!url.endsWith("&")) {
				url = url + "&";
			}
			url = url + "placename=" + URLEncoder.encode(placeName, "UTF8");
		}
		if (countryCode != null) {
			if (!url.endsWith("&")) {
				url = url + "&";
			}
			url = url + "country=" + countryCode;
		}

		URLConnection conn = new URL(url).openConnection();
		conn.setRequestProperty("User-Agent", USER_AGENT);
		SAXBuilder parser = new SAXBuilder();
		Document doc = parser.build(conn.getInputStream());

		Element root = doc.getRootElement();
		for (Object obj : root.getChildren("code")) {
			Element codeElement = (Element) obj;
			PostalCode code = new PostalCode();
			code.setPostalCode(codeElement.getChildText("postalcode"));
			code.setPlaceName(codeElement.getChildText("name"));
			code.setCountryCode(codeElement.getChildText("countryCode"));

			code.setLatitude(Double
					.parseDouble(codeElement.getChildText("lat")));
			code.setLongitude(Double.parseDouble(codeElement
					.getChildText("lng")));

			postalCodes.add(code);
		}

		return postalCodes;
	}