request获取json

$.ajax({
    type:'post',
    url:'${ctx}/recordServiceController/queryDetail.do',
    //contentType:'application/json;charset=utf-8',
    dataType:"json",
    //数据格式是json串，商品信息
    data:obj,
    success:function(){//返回json结果

    }
});

Map params = request.getParameterMap();
mav.addObject("map", params);