如何使PDF文件在HTML链接中下载？ [英] How to make PDF file downloadable in HTML link?

问题描述

 < a href =我正在给我的网页上的pdf文件链接下载， myfile.pdf>下载手册< / a> 
  

问题是当用户点击此链接时，

• 如果用户安装了Adobe Acrobat，则在Adobe Reader中的同一浏览器窗口中打开该文件。


• 如果Adobe Acrobat不是安装然后弹出用户下载文件。

但是我想让它总是弹出用户的下载不管Adobe Acrobat是否安装。

请告诉我如何做到这一点？

解决方案

而不是链接到.PDF文件，而是执行类似于

  a href =pdf_server.php？file = pdffilename>下载我的电子书< / a> 
  

输出自定义标题，打开PDF（二进制安全），并将数据打印到用户的浏览器，那么他们可以选择保存PDF，尽管他们的浏览器设置。 pdf_server.php应如下所示：

  header（Content-Type：application / octet-stream）; 
 
 $ file = $ _GET [file]。。pdf; 
 header（Content-Disposition：attachment; filename =。urlencode（$ file））; 
 header（Content-Type：application / octet-stream）; 
 header（Content-Type：application / download）; 
 header（Content-Description：File Transfer）; 
 header（Content-Length：。filesize（$ file））; 
 flush（）; //这并不重要。 
 $ fp = fopen（$ file，r）; 
 while（！feof（$ fp））
 {
 echo fread（$ fp，65536）; 
 flush（）; //这对于大量下载是至关重要的
} 
 fclose（$ fp）; 
  

PS：显然在文件变量上运行一些健全性检查，以防止人们窃取您的文件例如不接受文件扩展名，拒绝斜杠，将.pdf添加到值

I am giving link of a pdf file on my web page for download, like below

<a href="myfile.pdf">Download Brochure</a>

The problem is when user clicks on this link then

• If the user have installed Adobe Acrobat, then it opens the file in the same browser window in Adobe Reader.
• If the Adobe Acrobat is not installed then it pop-up to the user for Downloading the file.

But I want it always pop-up to the user for download, irrespective of "Adobe acrobat" is installed or not.

Please tell me how i can do this?

解决方案

Instead of linking to the .PDF file, instead do something like

<a href="pdf_server.php?file=pdffilename">Download my eBook</a>

which outputs a custom header, opens the PDF (binary safe) and prints the data to the user's browser, then they can choose to save the PDF despite their browser settings. The pdf_server.php should look like this:

header("Content-Type: application/octet-stream");

$file = $_GET["file"] .".pdf";
header("Content-Disposition: attachment; filename=" . urlencode($file));   
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");            
header("Content-Length: " . filesize($file));
flush(); // this doesn't really matter.
$fp = fopen($file, "r");
while (!feof($fp))
{
    echo fread($fp, 65536);
    flush(); // this is essential for large downloads
} 
fclose($fp); 

PS: and obviously run some sanity checks on the "file" variable to prevent people from stealing your files such as don't accept file extensions, deny slashes, add .pdf to the value

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