* @param param 预留参数,例: key1:'value1', key2:'value2' ...
*/
public static List<Category> getCategoryList(String siteId, String parentId, int number, String param){
Page<Category> page = new Page<Category>(1, number, -1);
Category category = new Category();
category.setSite(new Site(siteId));
category.setParent(new Category(parentId));
if (StringUtils.isNotBlank(param)){
@SuppressWarnings({ "unused", "rawtypes" })
Map map = JsonMapper.getInstance().fromJson("{"+param+"}", Map.class);
}