spring mvc返回json字符串数据，只需要返回一个java bean对象就行，只要这个java bean 对象实现了序列化serializeable

@RequestMapping(value = { "/actor_details" }, method = { RequestMethod.POST })
    @ResponseBody
    public ResultObject actorDetails(@RequestBody ActorDetailsRequest req) {
        logger.debug("查看{}主播信息", req.getAid());
        if (req.getAid() == null || req.getAid().equals("null")
                || req.getAid().equals("")) {
            return new ResultObject(ResultCode.NULL_PARAM);
        }
        ActorAndUser result = actorServiceImpl.queryActorData(req.getAid());
        return new ResultObject(result);
    }