修改提示

src/main/java/com/xjrsoft/common/utils/UploadUtil.java

@@ -97,7 +97,7 @@ public class UploadUtil {
         String contentType = file.getContentType();
         if (!rule.getAllowedMimeTypes().isEmpty() &&
                 !rule.getAllowedMimeTypes().contains(contentType)) {
-            throw new MyException("文件类型不匹配，仅支持: " +
+            throw new MyException("文件类型不匹配，仅支持: " + contentType +
                     String.join(", ", rule.getAllowedMimeTypes()));
         }
     }