Java使用POI导出Excel .xlsx提示文件格式或文件扩展名有误

1.前端如果用xlsx格式接收表格

后台用XSSFWorkbook workbook = new XSSFWorkbook();创建工作薄

 response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
 response.addHeader("Content-Disposition", "attachment;filename=fileName" + ".xlsx");

2.前端如果用xls格式接收表格

后台 用HSSFWorkbook workbook = new HSSFWorkbook();创建工作薄

response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition", "attachment;filename=fileName"+".xls");

来源：https://www.cnblogs.com/songyaru/p/12894357.html