Revert "注册登录，用户等级，社交，动态，新手任务"
This reverts commit 1c359108ca33d46271920ee0cd57dddcb7012937.
Reason for revert: <冲突>
Change-Id: Ie586267169acac99130b1fadf4a5f433441c4b8c
diff --git a/src/main/java/com/example/myproject/service/PromotionService.java b/src/main/java/com/example/myproject/service/PromotionService.java
new file mode 100644
index 0000000..087c13b
--- /dev/null
+++ b/src/main/java/com/example/myproject/service/PromotionService.java
@@ -0,0 +1,17 @@
+package com.example.myproject.service;
+
+import com.example.myproject.entity.Promotion;
+import com.example.myproject.dto.PromotionCreateDTO;
+import java.util.List;
+
+public interface PromotionService {
+ Promotion createPromotion(PromotionCreateDTO promotionDTO);
+
+ List<Promotion> getAllActivePromotions();
+
+ Promotion getPromotionById(Long promotionId);
+
+ void deletePromotion(Long promotionId);
+
+ double getCurrentDiscount(Long torrentId);
+}
\ No newline at end of file