fix:修复行为数据oss存储路径问题

src/main/java/com/njuzr/eaibackend/service/impl/BehaviorRecordServiceImpl.java

@@ -46,7 +46,8 @@ public class BehaviorRecordServiceImpl implements BehaviorRecordService {
         try {
             Date now = new Date();
             String filePath = "uploads/" + assignmentId + "_" + studentId + "_" + now.getTime() + file.getOriginalFilename();
-            String url = ossUtil.uploadFile(file.getInputStream(), filePath);
+            String urlStr = ossUtil.uploadFile(file.getInputStream(), filePath);
+            String url = urlStr.split("\\?")[0];
             BehaviorRecord behaviorRecord = new BehaviorRecord();
             behaviorRecord.setAssignmentId(assignmentId);
             behaviorRecord.setStudentId(studentId);