java实现砸金蛋抽奖功能

本文实例为大家分享了java实现砸金蛋抽奖的具体代码，供大家参考，具体内容如下

代码如下

需求：用户每一次砸金蛋，抽中一等奖的概率为2% 二等奖10% 三等奖18% 四等奖70%。

累计砸第n次时必抽中x等奖以上的奖品。比如，累计砸第5次，则此次必中二等奖及以上的奖品。且配置的此次必中中奖概率不一样。

/**
 * 金蛋抽奖
 * userid : 抽奖用户id
 * consumetype : 抽奖消耗的物品 1：金币 2：次数
 */
 @override
 public map<string, object> eggslottery(integer userid, integer consumetype) {
   /*******first : check user ************/
   checkuserislock(userid);
   logger.info("userid {} start lottery -eggs.", userid);
   jedis jedis = redispool.getjedis();
   try {
     //查询活动开关
     string hget = jedis.hget(rkey.smash_gold_eggs_global_config, "status");
     if (null == hget || "0".equals(hget)) {
       throw new busiexception(e.invalid_parameter, "活动暂未开启,敬请期待");
     }
     //check lottery type
     long consumescore = 0l;

     /**score lottery**/
     consumescore = jedis.hincrby(rkey.smash_gold_eggs_global_config, "consumegoldscore", 0);
     if (consumescore < 1) {
       throw new busiexception(e.eggs_activity_config_exception, "活动配置有误！");
     }
     long surscore = goldwalletmapper.selectamountgoldbyuserid(userid);
     surscore = surscore - consumescore;
     if (surscore < 0) {
       throw new busiexception(e.score_not_enough, "您的金币不足");
     }
     // 砸金蛋之前扣除金币
     date now = new date();
     reducegold(consumescore, now, userid);

     /*******second : lottery ************/
     map<string, object> map;
     try {
       map = lottery(jedis, now, userid, consumescore);
       // 抽奖结束后 记录今日总共完成的抽奖次数 +1
       // 必中 不加
       jedis.hincrby(rkey.smash_gold_eggs_user_win_total_count, userid.tostring(), 1);
     } catch (exception e) {
       throw e;
     }
     return map;
   } finally {
     redispool.returnjedis(jedis);
   }
 }

 /**
 * 抽奖 begin----
 */
 private map<string, object> lottery(jedis jedis, date now, integer userid, long consumescore) {
   map<string, object> map = new hashmap<string, object>();
   // 判断本次是否是必中？ jackpottype=1： 不是 2:是必中
   integer jackpottype = 1;
   // 剩余次数
   integer freecount = 0;
   string countstr = jedis.hget(rkey.smash_gold_eggs_user_win_count, userid.tostring());
   if (stringutils.isnotempty(countstr)) {
     integer count = integer.valueof(countstr);
     string whenawardcount = jedis.hget(rkey.smash_gold_eggs_global_config, "whenawardcount");

     if (stringutils.isempty(whenawardcount)) {
       throw new busiexception(e.invalid_request, "请先完善砸金蛋全局配置");
     }
     freecount = integer.valueof(whenawardcount) - count - 1;

     if (count >= integer.valueof(whenawardcount) - 1) {
       logger.info("此次是必中....");
       // 此次是必中
       jackpottype = 2;
       // 抽奖结束后 先把记录总共完成的抽奖次数 置为0次
       jedis.hdel(rkey.smash_gold_eggs_user_win_count, userid.tostring());
       jedis.hincrby(rkey.smash_gold_eggs_user_win_count, userid.tostring(), 0);
     } else {
       logger.info("此次不是必中....");
     }

     if (freecount == 0) {
       freecount = integer.valueof(whenawardcount);
     }
   }

   // 根据配置得到总的奖品数量
   integer totalcount = 0;
   if (jackpottype == 1) {
     totalcount = getawardtotalcount(1);
   } else {
     totalcount = getawardtotalcount(2);
   }
   integer award = getrandomnumber(totalcount);
   // 看落在哪个区间
   integer awardid = getwinawardid(award, jackpottype);
   bsgoldeggsconfig goldeggsconfig = goldeggsconfigmapper.selectbyid(awardid);
   if (goldeggsconfig == null) {
     throw new busiexception(e.invalid_request, "奖品信息未找到");
   }

   map.put("freecount", freecount);
   map.put("userid", userid);
   map.put("awardid", awardid);
   map.put("awardname", goldeggsconfig.getdescribe());
   map.put("goldcount", goldeggsconfig.getgoldcount());
   map.put("awardimg", goldeggsconfig.getawardimg());
   logger.info("userid {} win award {}, 奖励金币：{}, 随机生成抽奖数：{}", userid, goldeggsconfig.getdescribe(), goldeggsconfig.getgoldcount(), award);
   // 抽奖结束 action：
   if (jackpottype == 1) {
     // 抽奖结束后 记录累计抽奖次数 +1
     // 必中 不加
     jedis.hincrby(rkey.smash_gold_eggs_user_win_count, userid.tostring(), 1);
   }
   // 奖励金币结算
   date now1 = new date();
   lotteryaddgold(goldeggsconfig.getgoldcount().longvalue(), now1, userid);
   return map;
 }

 /**
 * 得到中奖id
 *
 * @param award ： 随机生成的抽奖数字
 * @return
 */
 private integer getwinawardid(integer award, integer jackpottype) {
   list<bsgoldeggsconfig> goldeggsconfiglist = goldeggsconfigmapper.queryalllist();
   if (goldeggsconfiglist == null || goldeggsconfiglist.size() < 4) {
     throw new busiexception(e.invalid_request, "请先完成砸金蛋奖品配置！");
   }

   integer[] weight = new integer[4];
   if (jackpottype == 1) {
     // 基础抽奖
     for (int i = 0; i < goldeggsconfiglist.size(); i++) {
       weight[i] = goldeggsconfiglist.get(i).getbaseweight();
     }
   } else {
     // 必中抽奖
     for (int i = 0; i < goldeggsconfiglist.size(); i++) {
       weight[i] = goldeggsconfiglist.get(i).getwinweight();
     }
   }
   // 判断随机数落在了哪个区间 左开右闭   ---------- 这里如果用redis的set来做区间？如何实现？
   integer awardid = 1;
   if (0 < award && award <= weight[0]) {
     // 一等奖
     awardid = 1;
   } else if (weight[0] < award && award <= (weight[0] + weight[1])) {
     // 二等奖
     awardid = 2;

   } else if ((weight[0] + weight[1]) < award && award <= (weight[1] + weight[2])) {
     // 三等奖
     awardid = 3;
   } else {
     // 四等奖
     awardid = 4;
   }
   return awardid;
 }
 /**
 * 获取1-max范围内 一个随机数
 *
 * @param max
 * @return
 */
 private integer getrandomnumber(integer max) {
   int i = (int) (math.random() * max + 1);

   return i;
 }

下面是用奖池写的一个算法 读者可忽略，博主只是记录一下。

思路：

根据需求：

1.生成两类奖池（普通奖池，和必中奖池），中奖概率不一样！为了保证概率正确，我们生成100组（1-100）的数字，随机打乱放入redis中，作为一个奖池。

2.生成中奖区间，放入redis

3.每次用户砸金蛋，从奖池里面取一个数，

4.判断该数在哪个中奖区间

/**
 * 抽奖 begin---- 该方法废除
 */
 private map<string, object> lottery2(jedis jedis, date now, integer userid, long consumescore) {
   // 从奖池中拿出第一个奖品
   string jackpotkey = rkey.smash_gold_eggs_jackpot_ + "one";
   string basewinlimitkey = rkey.smash_gold_eggs_award_win_limit_base;
   string nextwinlimitkey = rkey.smash_gold_eggs_award_win_limit_next;
   map<string, object> map = new hashmap<string, object>();

   // 奖池存在 且奖池不为空
   string awardflag = jedis.lpop(jackpotkey);  // 如：20
   integer award = integer.valueof(awardflag);

   //

   if (!stringutils.isempty(awardflag)) {
     // 判断该奖品的等级
     // 这里是有问题的 博主后面纠正
     set<string> winlimitset = jedis.zrange(basewinlimitkey, 0, award - 1);
     if (winlimitset != null && !winlimitset.isempty()) {
       integer size = winlimitset.size();
       list list = new arraylist(winlimitset);
       // 取区间最后一个
       string lastawardlevel = string.valueof(list.get(size - 1));

       // 获取奖品info
       integer id = null;
       if ("one".equals(lastawardlevel)) {
         id = 1;
       } else if ("two".equals(lastawardlevel)) {
         id = 2;
       } else if ("three".equals(lastawardlevel)) {
         id = 3;
       } else if ("four".equals(lastawardlevel)) {
         id = 4;
       }
       bsgoldeggsconfig goldeggsconfig = goldeggsconfigmapper.selectbyid(id);
       if (goldeggsconfig == null) {
         throw new busiexception(e.invalid_request, "奖品信息未找到");
       }
       map.put("userid", userid);
       map.put("awardid", id);
       map.put("awardname", goldeggsconfig.getdescribe());
       map.put("goldcount", goldeggsconfig.getgoldcount());
       logger.info("userid {} win award {}, 奖励金币：{}, 随机生成抽奖数：{}", userid, goldeggsconfig.getdescribe(), goldeggsconfig.getgoldcount(), award);
     }
   }
   return map;
 }
/**
 * 生成奖池
 *
 * @param jackpottype : 奖池类型 1：普通奖池 2：必中奖池
 * @param jackpotsort ：奖池序号 1,2,3...... 如普通奖池1，普通奖池2，
 */
 @override
 public void addawardtojackpot(integer jackpottype, integer jackpotsort) {

   // 存放奖池数据
   list<string> awadlist = new arraylist<>();
   // 奖池key
   string jackpotkey = "";
   string jackpottypetostr = "";
   if (jackpottype == 1) {
     jackpottypetostr = "普通";
     jackpotkey = rkey.smash_gold_eggs_jackpot_ + jackpotsort;
   } else {
     jackpottypetostr = "必中";
     jackpotkey = rkey.smash_gold_eggs_next_win_jackpot_ + jackpotsort;
   }

   logger.info("开始生成{}奖池{}。。。。。", jackpottypetostr, jackpotsort);
   jedis jedis = redispool.getjedis();
   try {

     if (jedis.exists(jackpotkey)) {
       // 判断奖池中是否还有奖品
       long length = jedis.llen(jackpotkey);
       if (length <= 0) {
         // 奖池空了，重新放入奖品
         logger.info("{}奖池{}空了，重新放入奖品。。。。。", jackpottypetostr, jackpotsort);
         // 根据配置得到总的奖品数量
         integer totalcount = getawardtotalcount(1);

         setsingleawardtojackpot(awadlist, jedis, jackpotkey, totalcount);
       }

     } else {
       // 直接生成奖池
       logger.info("{}奖池{}不存在，直接放入奖品。。。。。", jackpottypetostr, jackpotsort);
       integer totalcount = getawardtotalcount(1);
       setsingleawardtojackpot(awadlist, jedis, jackpotkey, totalcount);
     }
   } finally {
     redispool.returnjedis(jedis);
   }
 }


 /**
 * 获取奖池奖品数量
 *
 * @param type 奖池类型：1：普通奖池 2：必中奖池
 * @return
 */
 integer getawardtotalcount(integer type) {
   list<bsgoldeggsconfig> goldeggsconfiglist = goldeggsconfigmapper.queryalllist();
   if (goldeggsconfiglist == null || goldeggsconfiglist.size() < 4) {
     throw new busiexception(e.invalid_request, "请先完成砸金蛋奖品配置！");
   }
   integer totalcount = 0;
   if (type == 1) {
     // 普通奖池奖品数量
     for (bsgoldeggsconfig goldeggsconfig : goldeggsconfiglist) {
       totalcount += goldeggsconfig.getbaseweight();
     }


   } else {
     // 必中奖池数量
     jedis jedis = redispool.getjedis();
     try {
       string mustawardlevel = jedis.hget(rkey.smash_gold_eggs_global_config, "mustawardlevel");
       if (stringutils.isempty(mustawardlevel)) {
         throw new busiexception(e.invalid_request, "请先完成砸金蛋奖品配置！");
       }
       for (int i = 0; i < integer.valueof(mustawardlevel); i++) {
         totalcount += goldeggsconfiglist.get(i).getwinweight();
       }
     } finally {
       redispool.returnjedis(jedis);
     }


   }

   return totalcount;
 }

 /**
 * @param awadlist
 * @param jedis
 * @param jackpotkey
 * @param totalcount 总的奖品个数 比如一等奖10个，二等奖20个，三等奖30,四等奖40 则totalcount = 10+20+30+40=100
 */
 private void setsingleawardtojackpot(list<string> awadlist, jedis jedis, string jackpotkey, integer totalcount) {
   // 1.生成 100组 [1-100] 随机数 awadlist
   for (int i = 0; i < 2; i++) {
     list<integer> list = getonetohundrednumber(totalcount);
     for (integer j : list) {
       awadlist.add(j.tostring());
     }
   }

   // 2.awadlist打乱放入redis(list) 这里打乱2次
   collections.shuffle(awadlist);
   collections.shuffle(awadlist);

   // 3.放入redis
   awadlist.foreach(s -> jedis.lpush(jackpotkey, s));
   logger.info("奖品info：预设值：{} 实际设置：{}", 10000, awadlist.size());
 }

 /**
 * jdk8 得到包含1-end数字的list
 * end : 生成数字的个数
 *
 * @return
 */
 private list<integer> getonetohundrednumber(integer end) {
   // 起始数字
   int start = 1;
   // 生成数字的个数
   // int end = 100;
   // 生成1,2,3,4,5...100
   list<integer> list = stream.iterate(start, item -> item + 1).limit(end).collect(collectors.tolist());
   return list;
 }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。