java如何实现按照城市首字母分类，在freemarker页面展示

 

 

 @RequestMapping("getcity")
    public String example(Model model, HttpServletRequest request, HttpServletResponse response) {

        // 查询热门
        List<Map<String, Object>> list = queryGetCityService.getHotCitys();
        model.addAttribute("CityList", list);
       
        // 按首字母查排序所有城市
        List<Map<String, Object>> allCityList = queryGetCityService.getAllcityByLetter();

        Map<String, List<Object>> mapZm = new LinkedHashMap<String, List<Object>>();
      &nb