php如何实现对各种件下载
如果我们仅使用下载或者js的window.location = '文件路径/文件名',且文件类型为浏览器能识别的,那么浏览器将会直接打开文件而不是弹出下载框下载文件,比如'.txt','.conf','.bin'文件等。当然js的document.execCommand('SaveAs','mycodes.txt')(第二个参数为要保存为的文件名)也能实现下载,但它兼容性不好,firefox下无效。这时如果你的环境支持php语言,那么你可以用header()来实现文件下载:
先看简单实例:
同目录下有两个文件index.php,test.php与供下载文件adam.txt:
test.php文件内容:
$filename = $filename = 'adam.txt';
echo "下载";
?>
index.php文件内容:
$filename = $_REQUEST['filename'];
header("Content-Type:text/plain");
header('Content-Disposition:attachment;filename='.$filename);
header('Content-Transfer-Encodeing: binary');
readfile($filename);
?>
当你打开test.php并单击下载时将实现对adam.txt文件的下载。
同理,我们也可以实现对.jpg,.zip,.rar,.pdf等文件实现下载,这时只需把index.php中的header("Content-Type:text/plain")稍做修改,比如下面所示
header("Content-Type:application/zip");//zip或者rar
header("Content-Type:application/pdf");//pdf
header("Content-Type:image/jpeg");//图片
header("Content-Type:audio/mpeg");
摘自 adamboy

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