java下载文件时告警：文件格式和扩展名不匹配 方法

java下载的excel文件，打开时告警：

解决方法是：
1、 创建工作薄的时候，用Workbook workbook = new XSSFWorkbook();
设置正确的response头信息，

 response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.addHeader("Content-Disposition", "attachment;filename=" + new String("激励补发模板".getBytes("UTF-8"), "iso-8859-1") + ".xlsx");

2、创建工作薄的时候，用Workbook workbook = new HSSFWorkbook();

 response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition", "attachment;filename=" + new String("激励补发模板".getBytes("UTF-8"), "iso-8859-1") + ".xls");

一定要正确设置response头中的content-type；即设置正确的mime type,具体设置如下：

Ext	MIME Type
.doc	application/msword
.dot	application/msword
.docx	application/vnd.openxmlformats-officedocument.wordprocessingml.document
.dotx	application/vnd.openxmlformats-officedocument.wordprocessingml.template
.docm	application/vnd.ms-word.document.macroEnabled.12
.dotm	application/vnd.ms-word.template.macroEnabled.12
.xls	application/vnd.ms-excel
.xlt	application/vnd.ms-excel
.xlt	application/vnd.ms-excel
.xla	application/vnd.ms-excel
.xlsx	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltx	application/vnd.openxmlformats-officedocument.spreadsheetml.template
.xlsm	application/vnd.ms-excel.sheet.macroEnabled.12
.xltm	application/vnd.ms-excel.template.macroEnabled.12
.xlam	application/vnd.ms-excel.addin.macroEnabled.12
.xlsb	application/vnd.ms-excel.sheet.binary.macroEnabled.12
.ppt	application/vnd.ms-powerpoint
.pot	application/vnd.ms-powerpoint
.pps	application/vnd.ms-powerpoint
.ppa	application/vnd.ms-powerpoint
.pptx	application/vnd.openxmlformats-officedocument.presentationml.presentation
.potx	application/vnd.openxmlformats-officedocument.presentationml.template
.ppsx	application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppam	application/vnd.ms-powerpoint.addin.macroEnabled.12
.pptm	application/vnd.ms-powerpoint.presentation.macroEnabled.12
.potm	application/vnd.ms-powerpoint.presentation.macroEnabled.12
.ppsm	application/vnd.ms-powerpoint.slideshow.macroEnabled.12