数据库查询出的数据list 集合，转为json 的形式存到redis

    String keynew = "json";
        String o = (String)redisUtil.get(keynew);
        List<User> resultList = JSON.parseArray(o, User.class);
        if(resultList != null && resultList.size()>0){
            return  ResultUtil.success(resultList);
        }
        List<User> user= UserMapper.getStationList();
        redisUtil.set(keynew, JSON.toJSON(user).toString());
        return  ResultUtil.success(user);