Symfony2强制jpg下载返回损坏的文件 [英] Symfony2 forcing jpg download returns corrupted file

问题描述

关于这个问题的许多帖子中，我终于想出了这个版本的强制下载代码：

Following some of the many posts related to the subject I finally came up with this version of the "force download" code:

public function downloadAction(Request $request){

    $filename= 'test.jpg';
    $response = new Response();

    $response->headers->set('Content-Type','image/jpg');
    $response->headers->set('Content-Disposition', 'attachment; filename="' . basename($filename) . '"');        

    $response->sendHeaders();
    $response->setContent(file_get_contents($filename)); 

    return $response;
} 

现在，这可以很好的使用zip文件（显然使用正确的内容类型），但是对于jpg，会发生不同的事情。当使用HexCompare来检查原始和下载的JPG时，我发现下载的版本在文件的开头添加了EF BB BF。这似乎足以让Windows图像查看器报告错误的文件错误。

Now, this works fine with zip files (obviously using the right content-type), but for jpg something different happens. When using HexCompare to check both original and downloaded JPG I found that the downloaded version adds "EF BB BF" at the beginning of the file. This seems to be enough for the Windows Image Viewer, which ends reporting a corrupt file error.

另一方面，相同的下载jpg在Adobe Photoshop中完美打开（也许不太严格）？

On the other hand, the same downloaded jpg opens perfectly in Adobe Photoshop (less strict perhaps?)

想法？任何人？

提前感谢

Z

更新：使用此代码下载的Zip文件只能使用WinRAR或WinZIP打开，Windows Explorer Zip Extract显示损坏的文件错误消息。

UPDATE: Downloaded Zip files using this code can only be opened with WinRAR or WinZIP, Windows Explorer Zip Extract shows a Corrupt File Error message.

更新2：好的，我现在知道是BOM问题。现在，如何从file_get_content结果中摆脱那个令人讨厌的EF BB BF？

UPDATE2: OK, I know now is a BOM issue. Now, how can I get rid of that nasty "EF BB BF" from the file_get_content result?

推荐答案

请尝试以下内容建议此处

// Set headers
$response->headers->set('Cache-Control', 'private');
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition', 'attachment; filename="' . basename($filename) . '"');
$response->headers->set('Content-length', filesize($filename));

// Send headers before outputting anything
$response->sendHeaders();
$response->setContent(readfile($filename));

如果您使用apache与mod_xsendfile，请尝试：

If you're using apache with mod_xsendfile, try:

return new Response('', 200, array(
    'X-Sendfile'          => $filename,
    'Content-type'        => 'application/octect-stream',
    'Content-Disposition' => sprintf('attachment; filename="%s"', $filename)),
     // ...
));    

如果您使用nginx的X-Accel，请阅读这里。并使用

If you're using nginx's X-Accel read here. and use

return new Response('', 200, array(
    'X-Accel-Redirect'    => $filename,
    'Content-type'        => 'application/octect-stream',
    'Content-Disposition' => sprintf('attachment; filename="%s"', $filename)),
    // ...
));    

通过nginx获得更多的控制额外的可用选项是...

to gain more control with nginx additional available options are ...

// ...
'X-Accel-Limit-Rate' => '1024',
'X-Accel-Buffering'  => 'yes',  // yes|no
'X-Accel-Charset'    => 'utf-8',
 // ...

这篇关于Symfony2强制jpg下载返回损坏的文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！