这是SpringMVC控制器代码片段：

@RequestMapping(value = "/getCityList", method = RequestMethod.POST)
public @ResponseBody LinkedHashMap<String, String> getCityList(@RequestParam(value = "countryCode") String countryCode, HttpServletRequest request) throws Exception {
    //gets ordered city list of country  [sorted by city name]
    LinkedHashMap<String, String> cityList = uiOperationsService.getCityList(countryCode);

    for (String s : cityList.values()) {
        System.out.println(s); //prints sorted list  [sorted by name]
    }
    return cityList;
}

这是ajax调用：

function fillCityList(countryCode) {
        $.ajax({
            type: "POST",
            url: '/getCityList',
            data: {countryCode:countryCode},
            beforeSend:function(){
                $('#city').html("<option value=''>-- SELECT --</option>" );
            }
        }).done(function (data) {

            console.log(data); // UNSORTED JSON STRING  [Actually sorted by key... not by city name]

        })
    }

Sorted
LinkedHashMap从getCityList方法返回为未排序的JSON对象。为什么在退货过程中更改订单？是否由于ResponseBody注释将LinkedHashMap转换为HashMap？我可以通过Gson库将已排序的对象转换为json字符串，并从我的getCityList方法返回json字符串，但我不喜欢这种解决方案。我该怎么做才能为JavaScript回调方法提供排序列表？