修改下载的mimetype, 目前excel mimetype是 doc,兼容性比较差在macos 下载excel文件直接变成了 xlw格式了，建议升级 excel mimetype 到 excel2007 + ; 详解：docx、xlsx 这种 office 2007 格式 设置 MIME

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

@@ -322,6 +322,7 @@ 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.setCharacterEncoding("utf-8");
         this.init(list, sheetName, Type.EXPORT);
         exportExcel(response.getOutputStream());
@@ -335,7 +336,8 @@ public class ExcelUtil<T>
      */
     public void importTemplateExcel(HttpServletResponse response, String sheetName) throws IOException
     {
-        response.setContentType("application/vnd.ms-excel");
+        //response.setContentType("application/vnd.ms-excel");
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
         this.init(null, sheetName, Type.IMPORT);
         exportExcel(response.getOutputStream());