在拦截器中需要自己手动把JSON串转化为String类型，写入Response返回给前端

        //构造JSON串
        Result build = Result.build(null, ResultCodeEnum.NOTLOGIN);

        //JSON转字符串
        ObjectMapper objectMapper = new ObjectMapper();
        String josn = objectMapper.writeValueAsString(build);

        //json转为字符串后写入Response返回给前端
        response.getWriter().write(josn);