Commons Note

gistfile1.txt

$("#frm").serialize().split("&").sort();


	private static final Logger logger = LoggerFactory.getLogger(Commons.class);

	public static void writeJSON(HttpServletResponse response,
			final String label, final Object data) {
		JSONObject jsonObj = new JSONObject();
		jsonObj.put(label, data);
		response.setContentType("application/json; charset=UTF-8");
		response.setHeader("Cache-Control", "no-cache");

		try {
			response.getWriter().write(
					JSONObject.fromObject(jsonObj).toString());
		} catch (IOException e) {
			logger.debug(label, e);
		}
	}

	public static void eraseNull(final List<Map<String, Object>> list) {
		for (Map<String, Object> map : list) {
			eraseNull(map);
		}
	}

	public static void eraseNull(Map<String, Object> map) {
		Set<String> keySet = map.keySet();
		for (Iterator<String> iterator = keySet.iterator(); iterator.hasNext();) {
			String string = iterator.next();
			if (map.get(string) == null) {
				map.put(string, "");
			}
		}
	}

	public static List<String> getArrayList(Map<String, Object> paramMap,
			final String key) {
		List<String> list = new ArrayList<String>();
		if (paramMap.get(key) instanceof String) {
			list.add((String) paramMap.get(key));
		} else if (paramMap.get(key) instanceof String[]) {
			String[] vlist = (String[]) paramMap.get(key);
			for (int i = 0; i < vlist.length; i++) {
				list.add(((String[]) paramMap.get(key))[i]);
			}
		}
		return list;
	}