Java实现抽奖功能

CREATE TABLE `points_luck_draw_prize` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `name` varchar(50) DEFAULT NULL COMMENT '奖品名称',
 `url` varchar(50) DEFAULT NULL COMMENT '图片地址',
 `value` varchar(20) DEFAULT NULL,
 `type` tinyint(4) DEFAULT NULL COMMENT '类型1:红包2:积分3:体验金4:谢谢惠顾5:自定义',
 `status` tinyint(4) DEFAULT NULL COMMENT '状态',
 `is_del` bit(1) DEFAULT NULL COMMENT '是否删除',
 `position` int(5) DEFAULT NULL COMMENT '位置',
 `phase` int(10) DEFAULT NULL COMMENT '期数',
 `create_time` datetime DEFAULT NULL,
 `update_time` datetime DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=164 DEFAULT CHARSET=utf8mb4 COMMENT='奖品表';

CREATE TABLE `points_luck_draw_probability` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `points_prize_id` bigint(20) DEFAULT NULL COMMENT '奖品ID',
 `points_prize_phase` int(10) DEFAULT NULL COMMENT '奖品期数',
 `probability` float(4,2) DEFAULT NULL COMMENT '概率',
 `frozen` int(11) DEFAULT NULL COMMENT '商品抽中后的冷冻次数',
 `prize_day_max_times` int(11) DEFAULT NULL COMMENT '该商品平台每天最多抽中的次数',
 `user_prize_month_max_times` int(11) DEFAULT NULL COMMENT '每位用户每月最多抽中该商品的次数',
 `create_time` datetime DEFAULT NULL,
 `update_time` datetime DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=114 DEFAULT CHARSET=utf8mb4 COMMENT='抽奖概率限制表';

CREATE TABLE `points_luck_draw_record` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `member_id` bigint(20) DEFAULT NULL COMMENT '用户ID',
 `member_mobile` varchar(11) DEFAULT NULL COMMENT '中奖用户手机号',
 `points` int(11) DEFAULT NULL COMMENT '消耗积分',
 `prize_id` bigint(20) DEFAULT NULL COMMENT '奖品ID',
 `result` smallint(4) DEFAULT NULL COMMENT '1:中奖 2:未中奖',
 `month` varchar(10) DEFAULT NULL COMMENT '中奖月份',
 `daily` date DEFAULT NULL COMMENT '中奖日期（不包括时间）',
 `create_time` datetime DEFAULT NULL,
 `update_time` datetime DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3078 DEFAULT CHARSET=utf8mb4 COMMENT='抽奖记录表';

public class PrizePool implements Serializable{
 /**
  * 总池值
  */
 private int total;
 /**
  * 池中的奖品
  */
 private List<PrizePoolBean> poolBeanList;
}

public class PrizePoolBean implements Serializable{
 /**
  * 数据库中真实奖品的ID
  */
 private Long id;
 /**
  * 奖品的开始池值
  */
 private int begin;
 /**
  * 奖品的结束池值
  */
 private int end;
}

/**
  * 获取超级大富翁的奖品池
  * @param zillionaireProductMap 超级大富翁奖品map
  * @param flag true:有现金 false:无现金
  * @return
  */
 private PrizePool getZillionairePrizePool(Map<Long, ActivityProduct> zillionaireProductMap, boolean flag) {
  //总的奖品池值
  int total = 0;
  List<PrizePoolBean> poolBeanList = new ArrayList<>();
  for(Entry<Long, ActivityProduct> entry : zillionaireProductMap.entrySet()){
   ActivityProduct product = entry.getValue();
   //无现金奖品池，过滤掉类型为现金的奖品
   if(!flag && product.getCategoryId() == ActivityPrizeTypeEnums.XJ.getType()){
    continue;
   }
   //组装奖品池奖品
   PrizePoolBean prizePoolBean = new PrizePoolBean();
   prizePoolBean.setId(product.getProductDescriptionId());
   prizePoolBean.setBengin(total);
   total = total + product.getEarnings().multiply(new BigDecimal("10000")).intValue();
   prizePoolBean.setEnd(total);
   poolBeanList.add(prizePoolBean);
  }

  PrizePool prizePool = new PrizePool();
  prizePool.setTotal(total);
  prizePool.setPoolBeanList(poolBeanList);
  return prizePool;
}

public static PrizePoolBean getPrize(PrizePool prizePool){
  //获取总的奖品池值
  int total = prizePool.getTotal();
  //获取随机数
  Random rand=new Random();
  int random=rand.nextInt(total);
  //循环比较奖品池区间
  for(PrizePoolBean prizePoolBean : prizePool.getPoolBeanList()){
   if(random >= prizePoolBean.getBengin() && random < prizePoolBean.getEnd()){
    return prizePoolBean;
   }
  }
  return null;
 }

/**
  * 异步分发奖品
  * @param prizeList
  * @throws Exception
  */
 @Async("myAsync")
 @Transactional(rollbackFor = Exception.class, propagation = Propagation.REQUIRED)
 public Future<Boolean> sendPrize(Long memberId, List<PrizeDto> prizeList){
  try {
   for(PrizeDto prizeDto : prizeList){
    //过滤掉谢谢惠顾的奖品
    if(prizeDto.getType() == PointsLuckDrawTypeEnum.XXHG.getType()){
     continue;
    }
    //根据奖品类型从工厂中获取奖品发放类
    SendPrizeProcessor sendPrizeProcessor = sendPrizeProcessorFactory.getSendPrizeProcessor(
     PointsLuckDrawTypeEnum.getPointsLuckDrawTypeEnumByType(prizeDto.getType()));
    if(ObjectUtil.isNotNull(sendPrizeProcessor)){
     //发放奖品
     sendPrizeProcessor.send(memberId, prizeDto);
    }
   }
   return new AsyncResult<>(Boolean.TRUE);
  }catch (Exception e){
   //奖品发放失败则记录日志
   saveSendPrizeErrorLog(memberId, prizeList);
   LOGGER.error("积分抽奖发放奖品出现异常", e);
   return new AsyncResult<>(Boolean.FALSE);
  }
}

@Component
public class SendPrizeProcessorFactory implements ApplicationContextAware{
 private ApplicationContext applicationContext;

 @Override
 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
  this.applicationContext = applicationContext;
 }

 public SendPrizeProcessor getSendPrizeProcessor(PointsLuckDrawTypeEnum typeEnum){
  String processorName = typeEnum.getSendPrizeProcessorName();
  if(StrUtil.isBlank(processorName)){
   return null;
  }
  SendPrizeProcessor processor = applicationContext.getBean(processorName, SendPrizeProcessor.class);
  if(ObjectUtil.isNull(processor)){
   throw new RuntimeException("没有找到名称为【" + processorName + "】的发送奖品处理器");
  }
  return processor;
 }
}

/**
 * 红包奖品发放类
 */
@Component("sendHbPrizeProcessor")
public class SendHbPrizeProcessor implements SendPrizeProcessor{
 private Logger LOGGER = LoggerFactory.getLogger(SendHbPrizeProcessor.class);
 @Resource
 private CouponService couponService;
 @Resource
 private MessageLogService messageLogService;

 @Override
 public void send(Long memberId, PrizeDto prizeDto) throws Exception {
  // 发放红包
  Coupon coupon = couponService.receiveCoupon(memberId, Long.parseLong(prizeDto.getValue()));
  //发送站内信
  messageLogService.insertActivityMessageLog(memberId,
   "你参与积分抽大奖活动抽中的" + coupon.getAmount() + "元理财红包已到账，谢谢参与",
   "积分抽大奖中奖通知");
  //输出log日志
  LOGGER.info(memberId + "在积分抽奖中抽中的" + prizeDto.getPrizeName() + "已经发放！");
 }
}