Symfony 1.4：不使用模板/视图提供文件下载的最佳方式

Question

当然，其他人已经在 stackoverflow 上讨论过这些问题，但并非所有分析器都适合我，而且他们通常不提供 symfony 安装的版本。

我阅读的主题：

• Send attachment/Download file from Symfony action
• How to download a file on clicking thefile path using PHP-Symfony?
• symfony: setHttpHeader() doesn't work, header() does

这就是我要问您如何在 symfony 1.4 中处理文件下载（不使用视图）？ 在我所有的用例中，我需要一个模板文件来呈现响应。如果我发送由于控制器的响应，则唯一的可能性是在没有 php 错误（已发送标头）的情况下发送它

控制者：

/** @var $response sfWebResponse */
$response = $this->getResponse();
$response->clearHttpHeaders();
$response->setContentType($mimeType);
$response->setHttpHeader('Content-Disposition', 'attachment; filename="' . basename($filePath) . '"');
$response->setHttpHeader('Content-Description', 'File Transfer');
$response->setHttpHeader('Content-Transfer-Encoding', 'binary');
$response->setHttpHeader('Content-Length', filesize($filePath));
$response->setHttpHeader('Cache-Control', 'public, must-revalidate');
$response->setHttpHeader('Pragma', 'public');
$response->sendHttpHeaders();

readfile($filePath); die();

这无需模板文件即可工作。但是恕我直言，这不是那么漂亮的编码。

模板的替代方式：

控制者：

 /** @var $response sfWebResponse */
$response = $this->getResponse();
$response->clearHttpHeaders();
$response->setContentType($mimeType);
$response->setHttpHeader('Content-Disposition', 'attachment; filename="' . basename($filePath) . '"');
$response->setHttpHeader('Content-Description', 'File Transfer');
$response->setHttpHeader('Content-Transfer-Encoding', 'binary');
$response->setHttpHeader('Content-Length', filesize($filePath));
$response->setHttpHeader('Cache-Control', 'public, must-revalidate');
$response->setHttpHeader('Pragma', 'public');
$response->setContent(file_get_contents($filePath));
$response->sendHttpHeaders();

return sfView::NONE;

查看：

<?php echo $sf_response->getRawValue()->getContent(); ?>

Answer 1

我喜欢的解决方案

$filePath = $document->getAbsoluteFilePath();
$mimeType = mime_content_type($filePath);

/** @var $response sfWebResponse */
$response = $this->getResponse();
$response->clearHttpHeaders();
$response->setContentType($mimeType);
$response->setHttpHeader('Content-Disposition', 'attachment; filename="' . basename($filePath) . '"');
$response->setHttpHeader('Content-Description', 'File Transfer');
$response->setHttpHeader('Content-Transfer-Encoding', 'binary');
$response->setHttpHeader('Content-Length', filesize($filePath));
$response->setHttpHeader('Cache-Control', 'public, must-revalidate');
// if https then always give a Pragma header like this  to overwrite the "pragma: no-cache" header which
// will hint IE8 from caching the file during download and leads to a download error!!!
$response->setHttpHeader('Pragma', 'public');
//$response->setContent(file_get_contents($filePath)); # will produce a memory limit exhausted error
$response->sendHttpHeaders();

ob_end_flush();
return $this->renderText(readfile($filePath));

无需使用模板文件。 symfony 标准行为的使用。重要提示：模板文件必须存在！

Answer 2

根据文件的内容，我使用了两种方法。对于 Excel 文档等文档，我通常使用这种方法：

$this->getResponse()->clearHttpHeaders();
$this->getResponse()->setHttpHeaders('Content-Description','File Transer');
$this->getResponse()->setHttpHeaders('Content-Type','application/vnd.ms-excel'); //this would be based on your file
$this->getResponse()->setHttpHeaders('Content-Disposition','attachment;filename='.$filename); //$filename is name of file on server
$this->getResponse()->setHttpHeaders('Pragma','');
$this->getResponse()->setHttpHeaders('Cache-Control','');
$this->getResponse()->sendHttpHeaders();

$error_reporting = error_reporting(0);
$this->renderText($some_data->save('php://output')); //in this case the $some_data was a PHPExcel writer object but anything that can be saved to a [php://output][1] should work e.g. fwrite()
error_reporting($error_reporting);
return sfView::NONE

error_reporting 的关闭和打开与使用 PHPExcel 写入流有关。

我使用的另一种方法是使用sfResponse 的sendContent() 方法。这种用法的例子是：

$this->getResponse()->clearHttpheaders();
$this->getResponse()->setHttpHeader('Content-Description','File Transfer');
$this->getResponse()->setHttpHeader('Cache-Control', 'public, must-revalidate, max-age=0');
$this->getResponse()->setHttpHeader('Pragma: public',true);
$this->getResponse()->setHttpHeader('Content-Transfer-Encoding', 'binary'); 
$this->getResponse()->setHttpHeader('Content-length',filesize($filename)) //send the size of the file
$this->getResponse()->setHttpHeader('Content-Type','some_mime_type') // e.g. application/pdf, image/png etc.
$this->getResponse()->setHttpHeader('Content-Disposition','attachment; filename='.$filename) //some filename
$this->getResponse()->sendHttpHeaders(); //edited to add the missed sendHttpHeaders
$this->getResponse()->setContent(readfile($filename));

$this->getResponse()->sendContent();

return sfView::NONE;

这两种方法都有效，您不需要模板来呈现内容/文件。

注意：编辑在设置和发送内容之前添加$this->getResponse()->sendHttpHeaders()

Answer 3

你也可以用普通的 php 函数来做：

public function executeIndex(sfWebRequest $request)
{
  while(ob_get_level())
  {
    ob_end_clean();
  }

  // use plain php functions to
  // setup headers
  // ...
  // and read and echo the file

  throw new sfStopException();
}