概率随机、用户牛牌数量查询

activity-admin/src/main/java/com/polysoft/activity/controller/CattleController.java

+package com.polysoft.activity.controller;
+
+import com.polysoft.activity.model.param.UserInfoParam;
+import com.polysoft.activity.service.CattleBrandService;
+import com.polysoft.activity.utils.ApiResult;
+import io.swagger.annotations.Api;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.Resource;
+
+/**
+ * @author lvyp
+ * @date 2021/1/29
+ */
+@RestController
+@RequestMapping("/cattle")
+@Api(value = "牛牌", description = "牛牌接口")
+public class CattleController {
+
+    @Resource
+    private CattleBrandService cattleBrandService;
+
+    @GetMapping("/queryCattleBrandByUserId" )
+    @ResponseBody
+    public ApiResult queryCattleBrandByUserId(@RequestParam(value = "userId") Long userId) {
+        if(userId == null){
+            return ApiResult.error("用户不能为空");
+        }
+        return cattleBrandService.queryCattleBrandByUserId(userId);
+    }
+}

activity-admin/src/main/java/com/polysoft/activity/mapper/CattleBrandMapper.java

@@ -2,7 +2,9 @@ package com.polysoft.activity.mapper;
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.polysoft.activity.model.dto.CattleBrandDto;
+import com.polysoft.activity.model.vo.CattleBrandFroUserVO;
 import com.polysoft.activity.model.vo.CattleBrandVO;
+import org.apache.ibatis.annotations.Param;
 import org.mapstruct.Mapper;
 
 import java.util.List;
@@ -10,4 +12,5 @@ import java.util.List;
 @Mapper
 public interface CattleBrandMapper extends BaseMapper<CattleBrandDto> {
     List<CattleBrandVO> queryCattleBrandList();
+    CattleBrandFroUserVO queryCattleBrandByUserId(@Param("userId")Long userId);
 }

activity-admin/src/main/java/com/polysoft/activity/model/vo/CattleBrandFroUserVO.java

+package com.polysoft.activity.model.vo;
+
+import lombok.Data;
+
+/**
+ * @author lvyp
+ * @date 2021/1/29
+ */
+@Data
+public class CattleBrandFroUserVO {
+    private String jiangKang;
+    private String fuYun;
+    private String zhaoCai;
+    private String pingAn;
+    private String ruYi;
+}

activity-admin/src/main/java/com/polysoft/activity/service/CattleBrandService.java

 package com.polysoft.activity.service;
 
-import com.polysoft.activity.model.vo.CattleBrandVO;
 import com.polysoft.activity.utils.ApiResult;
 
-import java.util.List;
 
 public interface CattleBrandService {
     ApiResult queryCattleBrandList();
+    ApiResult queryCattleBrandByUserId(Long userId);
 }

activity-admin/src/main/java/com/polysoft/activity/service/impl/CattleBrandServiceImpl.java

@@ -16,4 +16,9 @@ public class CattleBrandServiceImpl implements CattleBrandService {
     public ApiResult queryCattleBrandList() {
         return ApiResult.ok(cattleBrandMapper.queryCattleBrandList());
     }
+
+    @Override
+    public ApiResult queryCattleBrandByUserId(Long userId) {
+        return ApiResult.ok(cattleBrandMapper.queryCattleBrandByUserId(userId));
+    }
 }

activity-admin/src/main/java/com/polysoft/activity/utils/MathRandom.java

+package com.polysoft.activity.utils;
+
+
+/**
+ * @author lvyp
+ * @date 2021/1/29
+ */
+public class MathRandom {
+    public MathRandom(double rate0, double rate1, double rate2, double rate3, double rate4) {
+        this.rate0 = rate0;
+        this.rate1 = rate1;
+        this.rate2 = rate2;
+        this.rate3 = rate3;
+        this.rate4 = rate4;
+    }
+
+    /**
+     * 0出现的概率为%50
+     */
+    public  double rate0;
+    /**
+     * 1出现的概率为%20
+     */
+    public  double rate1;
+    /**
+     * 2出现的概率为%15
+     */
+    public  double rate2 ;
+    /**
+     * 3出现的概率为%10
+     */
+    public  double rate3 ;
+    /**
+     * 4出现的概率为%4
+     */
+    public  double rate4 ;
+
+    /**
+     * Math.random()产生一个double型的随机数，判断一下
+     * 例如0出现的概率为%50，则介于0到0.50中间的返回0
+     * @return int
+     *
+     */
+    private int PercentageRandom()
+    {
+        double randomNumber;
+        randomNumber = Math.random();
+        if (randomNumber >= 0 && randomNumber <= rate0)
+        {
+            return 0;
+        }
+        else if (randomNumber >= rate0 / 100 && randomNumber <= rate0 + rate1)
+        {
+            return 1;
+        }
+        else if (randomNumber >= rate0 + rate1
+                && randomNumber <= rate0 + rate1 + rate2)
+        {
+            return 2;
+        }
+        else if (randomNumber >= rate0 + rate1 + rate2
+                && randomNumber <= rate0 + rate1 + rate2 + rate3)
+        {
+            return 3;
+        }
+        else if (randomNumber >= rate0 + rate1 + rate2 + rate3
+                && randomNumber <= rate0 + rate1 + rate2 + rate3 + rate4)
+        {
+            return 4;
+        }
+        else if (randomNumber >= rate0 + rate1 + rate2 + rate3 + rate4
+                && randomNumber <= rate0 + rate1 + rate2 + rate3 + rate4
+                )
+        {
+            return 5;
+        }
+        return -1;
+    }
+
+    /**
+     * 测试主程序
+     * @param agrs
+     */
+    public static void main(String[] agrs)
+    {
+        int i = 0;
+        MathRandom a = new MathRandom(0.50,0.30,0.15,0.04,0.01);
+        for (i = 0; i <= 100; i++)//打印100个测试概率的准确性
+        {
+            System.out.println(a.PercentageRandom()+1);
+        }
+    }
+
+}

activity-admin/src/main/resources/mapper/CattleBrandMapper.xml

@@ -8,6 +8,18 @@
             brand_type,
             brand_name
          from t_cattle_brand
+    </select>
+    <select id="queryCattleBrandByUserId" resultType="com.polysoft.activity.model.vo.CattleBrandFroUserVO">
+        SELECT
+        count( t.cattle_brand_id = 1 OR NULL ) as jiangKang,
+        count( t.cattle_brand_id = 2 OR NULL ) as fuYun,
+        count( t.cattle_brand_id = 3 OR NULL ) as zhaoCai,
+        count( t.cattle_brand_id = 4 OR NULL ) as pingAn,
+        count( t.cattle_brand_id = 5 OR NULL ) as ruYi
 
+        FROM
+            t_user_cattle t
+        WHERE
+	      t.user_id =#{userId} GROUP BY t.user_id
     </select>
 </mapper>