ADD file via upload

GradeService.java

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+package com.zsz.service;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.zsz.pojo.Grade;
+
+import java.util.List;
+
+public interface GradeService extends IService<Grade> {
+    Page<Grade> getGradesData(Page<Grade> gradePage, String gradeName);
+
+    List<Grade> getGrades();
+
+}
+