code: public Properties toProperties() {
  		final Properties properties = new Properties();
  		String group;
  		for (Entry<String, LinkedHashMap<String, String>> groupEntry : this.groupedMap.entrySet()) {
  			group = groupEntry.getKey();
  			for (Entry<String, String> entry : groupEntry.getValue().entrySet()) {
  				properties.setProperty(StrUtil.isEmpty(group) ? entry.getKey() : group + CharUtil.DOT + entry.getKey(), entry.getValue());
  			}
  		}
  		return properties;
  	}
docs: 转换为Properties对象，原分组变为前缀
  
  @return Properties对象