英文:
Mongodb and Gridfs file download
问题
我正在构建一个允许用户上传和下载文件的应用程序。目前我遇到的问题是，我可以从我的MongoDB数据库检索文件并通过我的机器将其下载到本地，但无法使其通过浏览器下载。
到目前为止，我尝试过这样做：
const conn = mongoose.createConnection(process.env.URL, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const bucket = new GridFSBucket(conn, {bucketName: 'uploads'});
router.get('/download', (req, res) => {
const files = bucket.openDownloadStreamByName('3987a162969935378c4f8cbe5d95bb46.svg').pipe(fs.createWriteStream('./3987a162969935378c4f8cbe5d95bb46.svg'))
res.end()
})
英文:
I'm building an application that allows the user to upload and download files. The issue i'm currently having is that I can retrieve the file from my MongoDB database and download it locally through my machine, but I can't get it to download through the browser.
So far I have tried doing it like this
const conn = mongoose.createConnection(process.env.URL, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const bucket = new GridFSBucket(conn, {bucketName: 'uploads'});
router.get('/download', (req, res) => {
const files = bucket.openDownloadStreamByName('3987a162969935378c4f8cbe5d95bb46.svg').pipe(fs.createWriteStream('./3987a162969935378c4f8cbe5d95bb46.svg'))
res.end()
})
答案1
得分: 1
如果我们想要直接将文件发送给客户端而不写入磁盘，请使用以下方法：
后端
router.get('/download', (req, res) => {
res.set('Content-disposition', 'attachment; filename="your_file_name.svg"');
res.set('Content-Type', 'image/svg+xml');
bucket.openDownloadStreamByName('your_file_name.svg').pipe(res);
})
前端
fetch('http://localhost:8000/download')
.then(res => res.blob())
.then(data => {
saveAs(data, 'your_file_name.svg');
})
英文:
If we want to send file directly to client without writing to disk, use this:
backend
router.get('/download', (req, res) => {
res.set('Content-disposition', `attachment; filename="your_file_name.svg"`);
res.set('Content-Type', 'image/svg+xml');
bucket.openDownloadStreamByName('your_file_name.svg').pipe(res);
})
frontend
fetch('http://localhost:8000/download')
.then(res => res.blob())
.then(data => {
saveAs(data, 'your_file_name.svg');
})
答案2
得分: 0
I do not think the issue is with mongoDB or Gridfs its how you are dealing with the file stream. If you want the file to be downloaded once the user calls /GET /download you need to use - res.download(file); e.g.
不是mongoDB或Gridfs的问题，而是你如何处理文件流的问题。如果你希望用户在调用/GET /download时下载文件，你需要使用 - res.download(file); 例如。
Good Luck!
祝你好运！
也访问这个 https://stackoverflow.com/questions/7288814/download-a-file-from-nodejs-server-using-express
英文:
I do not think the issue is with mongoDB or Gridfs its how you are dealing with the file stream. If you want the file to be downloaded once the user calls /GET /download you need to
use - res.download(file); e.g.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const conn = mongoose.createConnection(process.env.URL, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const bucket = new GridFSBucket(conn, {
bucketName: 'uploads'
});
router.get('/download', (req, res) => {
const files = bucket.openDownloadStreamByName('3987a162969935378c4f8cbe5d95bb46.svg').pipe(fs.createWriteStream('./3987a162969935378c4f8cbe5d95bb46.svg'))
res.download(files)
})
<!-- end snippet -->
Good Luck!
Also visit this https://stackoverflow.com/questions/7288814/download-a-file-from-nodejs-server-using-express
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