如何从节点快递服务器下载文件? [英] How to download files from node express server?

问题描述

我的服务器上有一个文件(Node.js + Express).我需要将文件从服务器下载到用户的计算机.在React应用程序中，我调用了将下载文件的函数:

I have a file on my server (Node.js + Express). I need to download file from server to computer of user. in React app I call the function which would download file:

downloadFileFromServer(file) { // file -- name of file
fetch(`${Config.baseUrl}/download-file/${this.props.params.idEvent}/${file}`, {
  method: 'GET'
})
    .then((response) => {
      if (response.status >= 400) {
        throw new Error('Bad response from server');
      }
      return response;
    });

}

在后端，我有这条路线:

On backend I have this route:

app.route('/download-file/:idEvent/:fileName')
.get((req, res) => {
  const id = `id${req.params.idEvent}`;
  const dir = `${Config.basePath}/${id}/${req.params.fileName}`;

  res.download(dir); // dir -- path to server's files. (something like this: 'var/www/... path to directory ...')
});

结果我没有任何结果.什么都没发生，控制台(前端，后端)为空，没有错误.

In result I haven't any results. Nothing happend, consoles (frontend, backend) are empty, without errors.

为什么我不能下载文件?如何解决?

Why I can't download file? How to fix it?

推荐答案

您必须使用以下命令在React中安装"js-file-download"库

you have to install "js-file-download" library in react using following command

npm install --save js-file-download

然后在react文件中添加如下代码:

then the code in react file as follows:

 import download from 'js-file-download';
downloadFile = () => {
   axios.get("localhost:3030/getfile")
     .then(resp => {
            download(resp.data, fileName);
     });
}

服务器端的代码如下:

router.get("/getfile", (req, res) => {
  FileLocation ="public/FILE.pdf"
  file="File.pdf"
 res.download(fileLocation, file, (err) => {
                if (err) console.log(err);
            });
});

我对这个答案的参考是在这个链接中.

My reference for this answer is in this link.

这对我有用.希望它对您有用.

This works for me.I hope it works for you.

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