daily

ibzdisk-core/src/main/java/cn/ibizlab/core/disk/extensions/service/DiskCoreService.java

@@ -205,7 +205,7 @@ public class DiskCoreService {
                 return fileName.substring(dot + 1);
             }
         }
-        return fileName;
+        return "";
     }
 
     public static String getExtensionName(File file) {