controller

//用户签到实现
	@PostMapping("/check")
	public AjaxResult check(@PathVariable String id) {
		//首先拼接key
		String day =  DateFormatUtils.format(new Date(), "yyyyMMdd");
		String key = id + ":" +day;
		//redis中是否存在该key
		Boolean flag = redisTemplate.hasKey(key);
		if(flag){
			return AjaxResult.error(500,"今日用户已签到");
		}else{
		//设置redis中的过期时间，凌晨0点清空；
			redisTemplate.opsForValue().set(key, day, getRefreshTime(), TimeUnit.SECONDS);
			//将未签到用户记录在mysql中
			int i = iPlatUserService.insert(id);
			if(i > 0){
			//签到成功
			return AjaxResult.success("用户成功签到");
			}else {
				return AjaxResult.error(500,"由于不正常原因，用户签到失败！");
			}
		}
	}


	/*
	* 获取当前时间离明天凌晨还有多少时间
	* */
	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);
	}