在jsp中加入以下代码即可

<%
String fileName = "导出excel.xls";
fileName = new String(fileName.getBytes("GBK"),"ISO8859_1");
response.setHeader("Content-Disposition",
"attachment;filename="+fileName);

response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
%>