java redis 实现用户签到功能(很普通简单的签到功能)

业务需求是用户每天只能签到一次，而且签到后用户增加积分，所以把用户每次签到时放到redis 缓存里面，然后每天凌晨时再清除缓存，大概简单思想是这样的 

直接看代码吧如下 

    @Transactional
    @Override
    public void signIn(Integer memberId) throws BizException {
        if(memberId==null){
            throw new BizException(ErrorCode.BIZ_EXCEPTION.getErrcode(), "签到用户id 不能为null");
        }
        String day =  DateFormatUtils.format(new Date(), "yyyyMMdd");
        String key = "signin:"+day;
        Boolean sismember = redisClient.sismember(key, memberId.toString());
        if(sismember){
            throw new BizException(ErrorCode.BIZ_EXCEPTION.getErrcode(), "今天已经签到了");
        }else{
            redisClient.sadd(key, memberId.toString());
            redisClient.expire(key, getRefreshTime());
            addPointsRecord(memberId,IntegralType.SIGN_IN);//给用户增加积分
        }
        
    }

2：获取离凌晨 还有多久

    /**
     * 获取当前时间离明天凌晨还有多少小时
     * @return
     */
    public static int getRefreshTime(){
        Calendar calendar = Calendar.getInstance();
        int now = (int) (calendar.getTimeInMillis()/1000);
        calendar.add(Calendar.DATE, 1);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.HOUR_OF_DAY , 0);
        return (int) (calendar.getTimeInMillis()/1000-now);
    }

3：Controller 

    /**
     * 签到
     * @return
     */
    @WeiXinLogin
    @RequestMapping("/signIn")
    public ResponseModel signIn(){
        try {
            Integer memberId = RequestContext.getContext().getUser().getMemberId();
            memberApi.signIn(memberId);
            return new ResponseModel();
        } catch (BizException e) {
            LOGGER.error("signIn error");
            return new ResponseModel(e.getErrcode(), e.getErrm(), null);
        }
    }