poi下载下载excel文件头设置

String fileName = "EXPORT_ALL.xls";

this.getResponse().reset();

this.getResponse().setHeader("Content-Disposition","attachment; charset=GBK; filename=" + fileName);

this.getResponse().setContentType("application/vnd.ms-excel");

this.getRequest().setCharacterEncoding("GBK");

/**从返回中文字符串的时候设置的编码**/

this.getResponse().setCharacterEncoding("GBK");

/**设置缓存**/

this.getResponse().setHeader("Cache-Control","no-cache");

this.getResponse().setHeader("Pragma","no-cache");