ex2-3 fix

api-service/src/main/java/cn/edu/zjvtit/cloudstorage/apiservice/controller/ObjectsController.java

@@ -57,7 +57,7 @@ public class ObjectsController {
             return new Result("no server available", "10000").toString();
         }
         String md5 = DigestUtils.md5DigestAsHex(requestBody);
-        ObjectEntity object = this.objectRepository.findByName(filename);
+        ObjectEntity object = this.objectRepository.findFirstByNameOrderByVersionDesc(filename);
         if (object == null) {
             object = new ObjectEntity();
             object.setName(filename);