如何将 pdf 文件从 Node/Express 应用程序发送到浏览器 [英] How to send a pdf file from Node/Express app to the browser

问题描述

在我的 Node/Express 应用程序中，我有以下代码，假设从文件中读取 PDF 文档，并将其发送到浏览器:

In my Node/Express app I have the following code, which suppose to read a PDF document from a file, and send it to the browser:

var file = fs.createReadStream('./public/modules/datacollectors/output.pdf', 'binary');
var stat = fs.statSync('./public/modules/datacollectors/output.pdf');
res.setHeader('Content-Length', stat.size);
res.setHeader('Content-Type', 'application/pdf');
res.setHeader('Content-Disposition', 'attachment; filename=quote.pdf');
res.pipe(file, 'binary');
res.end(); 

我没有收到任何错误，但我的浏览器中也没有收到该文件.我做错了什么?

I do not get any errors, but I do not get the file in my browser either. What am I doing wrong?

推荐答案

你必须从 Readable Stream 到 Writable 流进行管道传输，而不是相反:

You have to pipe from Readable Stream to Writable stream not the other way around:

var file = fs.createReadStream('./public/modules/datacollectors/output.pdf');
var stat = fs.statSync('./public/modules/datacollectors/output.pdf');
res.setHeader('Content-Length', stat.size);
res.setHeader('Content-Type', 'application/pdf');
res.setHeader('Content-Disposition', 'attachment; filename=quote.pdf');
file.pipe(res);

此外，您还以错误的方式设置编码，如果需要，请传递带有编码的对象.

Also you are setting encoding in wrong way, pass an object with encoding if needed.

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