20220608上传文件功能不区分文件后缀大小写

util/src/main/java/com/ccsens/util/UploadFileUtil_Servlet3.java

@@ -36,7 +36,7 @@ public class UploadFileUtil_Servlet3 {
         //2.生成文件名 [uuid.ext]
         String original = getFileNameByPart(part);
         String ext = FileUtil.extName(original);
-        if (StrUtil.isEmpty(ext) || !allowedExts.contains(ext)){
+        if (StrUtil.isEmpty(ext) || !allowedExts.contains(ext.toLowerCase())){
             throw new NotSupportedFileTypeException("不支持的格式类型: " + ext);
         }
         String path = extraPath + File.separator + IdUtil.simpleUUID() + "." + ext;