mime type fix

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java

@@ -321,8 +321,8 @@ public class ExcelUtil<T>
      */
     public void exportExcel(HttpServletResponse response, List<T> list, String sheetName) throws IOException
     {
-        response.setContentType("application/vnd.ms-excel");
-        //response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+        //response.setContentType("application/vnd.ms-excel");
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
         this.init(list, sheetName, Type.EXPORT);
         exportExcel(response.getOutputStream());