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通过php通过http向用户提供文件

http-headers apache php

Chris · 技术社区 · 14 年前

http://site.com/uploads/file.pdf 我可以检索一个文件。

<?php 

ini_set('display_errors',1);
error_reporting(E_ALL|E_STRICT);

//require global definitions 
require_once("includes/globals.php"); 
//validate the user before continuing 
isValidUser(); 
$subTitle = "Attachment";   
$attachmentPath = "/var/www/html/DEVELOPMENT/serviceNow/selfService/uploads/";
if(isset($_GET['id']) and !empty($_GET['id'])){
    //first lookup attachment meta information 
    $a = new Attachment(); 
    $attachment = $a->get($_GET['id']); 
    //filename will be original file name with user name.n prepended 
    $fileName = $attachmentPath.$_SESSION['nameN'].'-'.$attachment->file_name; 
    //instantiate new attachmentDownload and query for attachment chunks 
    $a = new AttachmentDownload(); 
    $chunks= $a->getRecords(array('sys_attachment'=>$_GET['id'], '__order_by'=>'position')); 


    $fh = fopen($fileName.'.gz','w');                                                      
    // read and base64 encode file contents 
    foreach($chunks as $chunk){
            fwrite($fh, base64_decode($chunk->data));   
    }
    fclose($fh);

    //open up filename for writing 
    $fh = fopen($fileName,'w');     
    //open up filename.gz for extraction                                
    $zd = gzopen($fileName.'.gz', "r");
    //iterate over file and write contents 
    while (!feof($zd)) {
            fwrite($fh, gzread($zd, 60*57));    
    }
    fclose($fh); 
    gzclose($zd);
    unlink($fileName.'.gz'); 
    $info = pathinfo($fileName); 

    header('Content-Description: File Transfer');
    header('Content-Type: '.Mimetypes::get($info['extension']));
    header('Content-Disposition: attachment; filename=' . basename($fileName));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($fileName));
    ob_clean();
    flush();
    readfile($fileName);
    exit();
}else{
    header("location: ".$links['status']."?".urlencode("item=incident&action=view&status=-1&place=".$links['home']));   
}


?>

"File type plain text document (text/plain) is not supported"

4 回复 | 直到 14 年前

ngroot 14 年前

首先,我先检查HTTP头。您可以在Firefox中使用“livehttpheaders”扩展轻松地实现这一点;不确定在其他浏览器中是否有等价物。这将允许您验证标头是否实际设置为“application/pdf”,以及其他标头是否也设置为“application/pdf”。

如果没有设置任何标头,则可能会在调用之前无意中发送输出 header() <?php 标签?

ianmclaury 14 年前

您确定application/pdf是浏览器实际看到的标题吗?

HTTP Client 适用于Mac或Firefox的Firebug。

Marco Demaio 14 年前

if(file_exists($file_serverfullpath))
{    
   header("Pragma: public");
   header("Expires: 0");
   header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
   header("Cache-Control: private", false);

   //sending download file
   header("Content-Type: application/octet-stream"); //application/octet-stream is more generic it works because in now days browsers are able to detect file anyway
   header("Content-Disposition: attachment; filename=\"" . basename($file_serverfullpath) . "\""); //ok
   header("Content-Transfer-Encoding: binary");
   header("Content-Length: " . filesize($file_serverfullpath)); //ok
   readfile($file_serverfullpath);
}

schuilr 14 年前

请尝试在“error_reporting(0);”前面加上前缀。我在网站的评论中发现了这个 http://php.net/readfile (您从中获取此示例)。

另一个问题是文件大小。过去曾报道过PHP5(我们在这里讨论的是2005年,所以我希望现在可以解决这个问题)在读取大于2MB的文件时遇到问题。如果文件大小超过此值,您可能需要验证它是否读取整个文件。