免房券

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/service/impl/BusMarketCouponsUsedServiceImpl.java

@@ -24,10 +24,10 @@ import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.transaction.annotation.Transactional;
 
 import javax.annotation.Resource;
+import java.math.BigInteger;
 import java.text.SimpleDateFormat;
 import java.time.LocalDateTime;
-import java.util.ArrayList;
-import java.util.List;
+import java.util.*;
 
 /**
  * @Description: 免房券领取使用表
@@ -43,14 +43,18 @@ public class BusMarketCouponsUsedServiceImpl extends ServiceImpl<BusMarketCoupon
     @Resource
     private BusMarketCouponsMapper busMarketCouponsMapper;
 
+    /**
+     * 生成16位数字+prefix
+     * @param prefix
+     * @return
+     */
     private String randomNumber(String prefix) {
-        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSSS");
-        String number = sdf.format(System.currentTimeMillis());
-
-        //补充一个三位随机数
-        int x = (int) (Math.random() * 900) + 100;
-        String serialNumber = prefix + number + x;
-        return serialNumber;
+        int first = new Random(10).nextInt(8) + 1;
+        int hashCode = UUID.randomUUID().toString().hashCode();
+        if (hashCode < 0) {
+            hashCode = -hashCode;
+        }
+        return prefix + first + String.format("%015d", hashCode);
     }
 
     /**