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，
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：
ExtMIME Type.docapplication/msword.dotapplication/msword.docxapplication/vnd.openxmlformats-officedocument.wordprocessingml.document.dotxapplication/vnd.openxmlformats-officedocument.wordprocessingml.template.docmapplication/vnd.ms-word.document.macroEnabled.12.dotmapplication/vnd.ms-word.template.macroEnabled.12.xlsapplication/vnd.ms-excel.xltapplication/vnd.ms-excel.xltapplication/vnd.ms-excel.xlaapplication/vnd.ms-excel.xlsxapplication/vnd.openxmlformats-officedocument.spreadsheetml.sheet.xltxapplication/vnd.openxmlformats-officedocument.spreadsheetml.template.xlsmapplication/vnd.ms-excel.sheet.macroEnabled.12.xltmapplication/vnd.ms-excel.template.macroEnabled.12.xlamapplication/vnd.ms-excel.addin.macroEnabled.12.xlsbapplication/vnd.ms-excel.sheet.binary.macroEnabled.12.pptapplication/vnd.ms-powerpoint.potapplication/vnd.ms-powerpoint.ppsapplication/vnd.ms-powerpoint.ppaapplication/vnd.ms-powerpoint.pptxapplication/vnd.openxmlformats-officedocument.presentationml.presentation.potxapplication/vnd.openxmlformats-officedocument.presentationml.template.ppsxapplication/vnd.openxmlformats-officedocument.presentationml.slideshow.ppamapplication/vnd.ms-powerpoint.addin.macroEnabled.12.pptmapplication/vnd.ms-powerpoint.presentation.macroEnabled.12.potmapplication/vnd.ms-powerpoint.presentation.macroEnabled.12.ppsmapplication/vnd.ms-powerpoint.slideshow.macroEnabled.12