如果要将查询结果导出Excel，只要将页面的Context-Type修改下：
header( "Content-Type: application/vnd.ms-excel">
如果希望能够提供打开/保存的对话框可以配置Content-Disposition参数，这个参数本来是为了在客户端另存文件时提供一个建议的文件名，但是考虑到安全的原因，就从规范中去掉了。
具体使用如：
response.addHeader("Content-Disposition: inline; filename=文件名.mp3"); --- inline表示在线打开
response.addHeader("Content-Disposition：attachment; filename=test.xls"); --- attachment表示作为附件下载
IE根据Content-Disposition中filename的后缀来识别文件类型，如果有多种文件类型，可以将Content-Type设置为二进制模式：
response.addHeader("Content-type: application/octet-stream");
另外还有一些其他的mimetypes = array(
\'doc\' => \'application/msword\',
\'bin\' => \'application/octet-stream\',
\'exe\' => \'application/octet-stream\',
\'so\' => \'application/octet-stream\',
\'dll\' => \'application/octet-stream\',
\'pdf\' => \'application/pdf\',
\'ai\' => \'application/postscript\',
\'xls\' => \'application/vnd.ms-excel\',
\'ppt\' => \'application/vnd.ms-powerpoint\',
\'dir\' => \'application/x-director\',
\'js\' => \'application/x-javascript\',
\'swf\' => \'application/x-shockwave-flash\',
\'xhtml\' => \'application/xhtml+xml\',
\'xht\' => \'application/xhtml+xml\',
\'zip\' => \'application/zip\',
\'mid\' => \'audio/midi\',
\'midi\' => \'audio/midi\',
\'mp3\' => \'audio/mpeg\',
\'rm\' => \'audio/x-pn-realaudio\',
\'rpm\' => \'audio/x-pn-realaudio-plugin\',
\'wav\' => \'audio/x-wav\',
\'bmp\' => \'image/bmp\',
\'gif\' => \'image/gif\',
\'jpeg\' => \'image/jpeg\',
\'jpg\' => \'image/jpeg\',
\'png\' => \'image/png\',
\'css\' => \'text/css\',
\'html\' => \'text/html\',
\'htm\' => \'text/html\',
\'txt\' => \'text/plain\',
\'xsl\' => \'text/xml\',
\'xml\' => \'text/xml\',
\'mpeg\' => \'video/mpeg\',
\'mpg\' => \'video/mpeg\',
\'avi\' => \'video/x-msvideo\',
\'movie\' => \'video/x-sgi-movie\',
);