[英]Streaming files directly into GridFS with Node.js, Express.js and gridfs-stream
[英]stored files directly in mongodb with gridfs-stream
我需要保存一些文件,例如:images,video,pdf ...到mongodb中,所以我使用gridfs-stream和express.js
var file = req.files.file;
req.pipe(gfs.createWriteStream({
filename:file.originalname,
mode:"w",
chunkSize:1024*4,
content_type:file.mimetype,
root:"fs"
})
res.send(200);
為了測試,我使用郵遞員並通過以下方式設置POST請求:
POST /fs/upload HTTP/1.1
Host: localhost:5000
Cache-Control: no-cache
----WebKitFormBoundaryE19zNvXGzXaLvS5C
Content-Disposition: form-data; name="file"; filename="epic.png"
Content-Type: image/png
----WebKitFormBoundaryE19zNvXGzXaLvS5C
問題是這種方式只存儲文件的數據:
{
"_id" : ObjectId("54d14ec5b102fe401519a3c1"),
"filename" : "epic.png",
"contentType" : "image/png",
"length" : 0,
"chunkSize" : 4096,
"uploadDate" : ISODate("2015-02-03T22:42:14.730Z"),
"aliases" : null,
"metadata" : null,
"md5" : "993fb9ce262a96a81c79a38106147e95"
}
但是內容不是我的意思是將其二進制數據存儲到mongodb中,因此它的屬性長度等於0,因為fs.chucks中沒有任何塊。
通過在博客中閱讀,發現了使用express.js,gridfs-stream.js和multer中間件直接在數據庫中流數據的答案:
var multer = require('multer');
app.post('/fs/upload', multer({
upload: null,// take uploading process
onFileUploadStart: function (file) {
//set upload with WritableStream
this.upload = gfs.createWriteStream({
filename: file.originalname,
mode: "w",
chunkSize: 1024*4,
content_type: file.mimetype,
root: "fs"
});
},
onFileUploadData: function (file, data) {
//put the chucks into db
this.upload.write(data);
},
onFileUploadComplete: function (file) {
//end process
this.upload.on('drain', function () {
this.upload.end();
});
}
}), function (req, res) {
res.sendStatus(200);
});
為了測試:
app.route('/fs/download/:file').get(function (req, res) {
var readstream = gfs.createReadStream({_id: req.params.file});
readstream.pipe(res);
});
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