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

问题描述

我在我的网页上提供了一个 pdf 文件的链接以供下载，如下所示

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

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

问题是当用户点击这个链接时

The problem is when user clicks on this link then

• 如果用户安装了 Adob​​e Acrobat，则会在 Adob​​e Reader 的同一浏览器窗口中打开文件.
• 如果未安装 Adob​​e Acrobat，则会向用户弹出下载文件.

但我希望它总是弹出给用户下载，无论是否安装了Adobe acrobat".

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

请告诉我该怎么做?

推荐答案

不要链接到 .PDF 文件，而是执行类似

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

<a href="pdf_server.php?file=pdffilename">Download my eBook</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，然后他们可以选择保存 PDF，而不管他们的浏览器设置.pdf_server.php 应如下所示:

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:并且显然对file"变量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 添加到值中

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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