手把手教你實現(xiàn)一個抽獎系統(tǒng)(Java版)
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-? ?1 概述? ? -

-? ?2 獎品? ? -
CREATE?TABLE?`points_luck_draw_prize`?(
??`id`?bigint(20)?NOT?NULL?AUTO_INCREMENT,
??`name`?varchar(50)?DEFAULT?NULL?COMMENT?'獎品名稱',
??`url`?varchar(50)?DEFAULT?NULL?COMMENT?'圖片地址',
??`value`?varchar(20)?DEFAULT?NULL,
??`type`?tinyint(4)?DEFAULT?NULL?COMMENT?'類型1:紅包2:積分3:體驗金4:謝謝惠顧5:自定義',
??`status`?tinyint(4)?DEFAULT?NULL?COMMENT?'狀態(tài)',
??`is_del`?bit(1)?DEFAULT?NULL?COMMENT?'是否刪除',
??`position`?int(5)?DEFAULT?NULL?COMMENT?'位置',
??`phase`?int(10)?DEFAULT?NULL?COMMENT?'期數(shù)',
??`create_time`?datetime?DEFAULT?NULL,
??`update_time`?datetime?DEFAULT?NULL,
??PRIMARY?KEY?(`id`)
)?ENGINE=InnoDB?AUTO_INCREMENT=164?DEFAULT?CHARSET=utf8mb4?COMMENT='獎品表';
CREATE?TABLE?`points_luck_draw_probability`?(
??`id`?bigint(20)?NOT?NULL?AUTO_INCREMENT,
??`points_prize_id`?bigint(20)?DEFAULT?NULL?COMMENT?'獎品ID',
??`points_prize_phase`?int(10)?DEFAULT?NULL?COMMENT?'獎品期數(shù)',
??`probability`?float(4,2)?DEFAULT?NULL?COMMENT?'概率',
??`frozen`?int(11)?DEFAULT?NULL?COMMENT?'商品抽中后的冷凍次數(shù)',
??`prize_day_max_times`?int(11)?DEFAULT?NULL?COMMENT?'該商品平臺每天最多抽中的次數(shù)',
??`user_prize_month_max_times`?int(11)?DEFAULT?NULL?COMMENT?'每位用戶每月最多抽中該商品的次數(shù)',
??`create_time`?datetime?DEFAULT?NULL,
??`update_time`?datetime?DEFAULT?NULL,
??PRIMARY?KEY?(`id`)
)?ENGINE=InnoDB?AUTO_INCREMENT=114?DEFAULT?CHARSET=utf8mb4?COMMENT='抽獎概率限制表';
CREATE?TABLE?`points_luck_draw_record`?(
??`id`?bigint(20)?NOT?NULL?AUTO_INCREMENT,
??`member_id`?bigint(20)?DEFAULT?NULL?COMMENT?'用戶ID',
??`member_mobile`?varchar(11)?DEFAULT?NULL?COMMENT?'中獎用戶手機(jī)號',
??`points`?int(11)?DEFAULT?NULL?COMMENT?'消耗積分',
??`prize_id`?bigint(20)?DEFAULT?NULL?COMMENT?'獎品ID',
??`result`?smallint(4)?DEFAULT?NULL?COMMENT?'1:中獎?2:未中獎',
??`month`?varchar(10)?DEFAULT?NULL?COMMENT?'中獎月份',
??`daily`?date?DEFAULT?NULL?COMMENT?'中獎日期(不包括時間)',
??`create_time`?datetime?DEFAULT?NULL,
??`update_time`?datetime?DEFAULT?NULL,
??PRIMARY?KEY?(`id`)
)?ENGINE=InnoDB?AUTO_INCREMENT=3078?DEFAULT?CHARSET=utf8mb4?COMMENT='抽獎記錄表';

-? ?3 獎品池? ? -
public?class?PrizePool?implements?Serializable{
????/**
?????*?總池值
?????*/
????private?int?total;
????/**
?????*?池中的獎品
?????*/
????private?List?poolBeanList;
}
public?class?PrizePoolBean?implements?Serializable{
????/**
?????*?數(shù)據(jù)庫中真實獎品的ID
?????*/
????private?Long?id;
????/**
?????*?獎品的開始池值
?????*/
????private?int?begin;
????/**
?????*?獎品的結(jié)束池值
?????*/
????private?int?end;
}
/**
?????*?獲取超級大富翁的獎品池
?????*?@param?zillionaireProductMap?超級大富翁獎品map
?????*?@param?flag?true:有現(xiàn)金??false:無現(xiàn)金
?????*?@return
?????*/
????private?PrizePool?getZillionairePrizePool(Map?zillionaireProductMap,?boolean?flag)?{
????????//總的獎品池值
????????int?total?=?0;
????????List?poolBeanList?=?new?ArrayList<>();
????????for(Entry?entry?:?zillionaireProductMap.entrySet()){
????????????ActivityProduct?product?=?entry.getValue();
????????????//無現(xiàn)金獎品池,過濾掉類型為現(xiàn)金的獎品
????????????if(!flag?&&?product.getCategoryId()?==?ActivityPrizeTypeEnums.XJ.getType()){
????????????????continue;
????????????}
????????????//組裝獎品池獎品
????????????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;
????}

-? ?4 抽獎算法? ? -
1.?隨機(jī)獎品池總池值以內(nèi)的整數(shù)?
2. 循環(huán)比較獎品池中的所有獎品,隨機(jī)數(shù)落到哪個獎品的池區(qū)間即為哪個獎品中獎。
public?static?PrizePoolBean?getPrize(PrizePool?prizePool){
????????//獲取總的獎品池值
????????int?total?=?prizePool.getTotal();
????????//獲取隨機(jī)數(shù)
????????Random?rand=new?Random();
????????int?random=rand.nextInt(total);
????????//循環(huán)比較獎品池區(qū)間
????????for(PrizePoolBean?prizePoolBean?:?prizePool.getPoolBeanList()){
????????????if(random?>=?prizePoolBean.getBengin()?&&?random?????????????????return?prizePoolBean;
????????????}
????????}
????????return?null;
????}

-? ?5 獎品限制? ? -
1. 限制的獎品比較少,通常不多于3個:這種情況我們可以再組裝獎品池的時候就把不符合條件的獎品過濾掉,這樣抽中的獎品都是符合條件的。例如,在上面的超級大富翁抽獎代碼中,我們規(guī)定現(xiàn)金獎品一天只能被抽中5次,那么我們可以根據(jù)判斷條件分別組裝出有現(xiàn)金的獎品和沒有現(xiàn)金的獎品。
2. 限制的獎品比較多,這樣如果要采用第一種方式,就會導(dǎo)致組裝獎品非常繁瑣,性能低下,我們可以采用抽中獎品后校驗抽中的獎品是否符合條件,如果不符合條件則返回一個固定的獎品即可。

-? ?6 獎品發(fā)放? ? -
/**
?????*?異步分發(fā)獎品
?????*?@param?prizeList
?????*?@throws?Exception
?????*/
????@Async("myAsync")
????@Transactional(rollbackFor?=?Exception.class,?propagation?=?Propagation.REQUIRED)
????public?Future?sendPrize(Long?memberId,?List?prizeList){
????????try?{
????????????for(PrizeDto?prizeDto?:?prizeList){
????????????????//過濾掉謝謝惠顧的獎品
????????????????if(prizeDto.getType()?==?PointsLuckDrawTypeEnum.XXHG.getType()){
????????????????????continue;
????????????????}
????????????????//根據(jù)獎品類型從工廠中獲取獎品發(fā)放類
????????????????SendPrizeProcessor?sendPrizeProcessor?=?sendPrizeProcessorFactory.getSendPrizeProcessor(
????????????????????PointsLuckDrawTypeEnum.getPointsLuckDrawTypeEnumByType(prizeDto.getType()));
????????????????if(ObjectUtil.isNotNull(sendPrizeProcessor)){
????????????????????//發(fā)放獎品
????????????????????sendPrizeProcessor.send(memberId,?prizeDto);
????????????????}
????????????}
????????????return?new?AsyncResult<>(Boolean.TRUE);
????????}catch?(Exception?e){
????????????//獎品發(fā)放失敗則記錄日志
????????????saveSendPrizeErrorLog(memberId,?prizeList);
????????????LOGGER.error("積分抽獎發(fā)放獎品出現(xiàn)異常",?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("沒有找到名稱為【"?+?processorName?+?"】的發(fā)送獎品處理器");
????????}
????????return?processor;
????}
}
/**
?*?紅包獎品發(fā)放類
?*/
@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?{
????????//?發(fā)放紅包
????????Coupon?coupon?=?couponService.receiveCoupon(memberId,?Long.parseLong(prizeDto.getValue()));
????????//發(fā)送站內(nèi)信
????????messageLogService.insertActivityMessageLog(memberId,
????????????"你參與積分抽大獎活動抽中的"?+?coupon.getAmount()?+?"元理財紅包已到賬,謝謝參與",
????????????"積分抽大獎中獎通知");
????????//輸出log日志
????????LOGGER.info(memberId?+?"在積分抽獎中抽中的"?+?prizeDto.getPrizeName()?+?"已經(jīng)發(fā)放!");
????}
}
? 作者?|??秦霜
來源 |??csdn.net/wang258533488/article/details/78901303
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