docs: public static String getProperty(final ResourceBundle bundle, final String key) {
  		if (bundle == null) {
  			return key;
  		}
  		try {
  			return bundle.getString(key);
  		} catch (MissingResourceException e) {
  			LOG.warn("找不到名为 " + key + " 的资源项", e);
  			return key;
  		}
  	}