文件下载不适用于Node.js gridfs

本文介绍了文件下载不适用于Node.js gridfs的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用node和express将图像上传到gridfs-stream.上传工作正常，但无法下载

i'm uploading images to gridfs-stream using node and express..uploading is working fine but am unable to download

app.post('/upload', function (req, res) { var tempfile = req.files.displayImage.path; var origname = req.files.displayImage.name; var _id = guid(); var writestream = gfs.createWriteStream({ filename: _id }); // open a stream to the temporary file created by Express... fs.createReadStream(tempfile) .on('end', function () { res.send(_id); }) .on('error', function () { res.send('ERR'); }) // and pipe it to gfs .pipe(writestream); }); app.get('/download', function (req, res) { // TODO: set proper mime type + filename, handle errors, etc... gfs // create a read stream from gfs... .createReadStream({ filename: req.param('filename') }) // and pipe it to Express' response .pipe(res); });

上面的代码无法通过此cmd download?filename=acf58ae4-c853-f9f3-5c66-c395b663298a

the above code is unable to download the image by this cmd download?filename=acf58ae4-c853-f9f3-5c66-c395b663298a

推荐答案

您可能需要检查参数中的值.但是希望这个 near 最小样本可以提供一些帮助:

You might need to check your values in params. But hopefully this near minimal sample provides some help:

它有所帮助，因为它突出显示您正在将_id查找为文件名.相反，您应该这样做:

And it has helped, because it highlights that you are looking up the _id as a filename. Instead you should be doing this:

.createReadStream({ _id: req.param('filename') })

如果不是

.createReadStream({ _id: mongoose.Types.ObjectId(req.param('filename')) })

由于_id字段与文件名不同

app.js

var express = require('express'); var routes = require('./routes'); var http = require('http'); var path = require('path'); var app = express(); var mongoose = require('mongoose'); var Grid = require('gridfs-stream'); Grid.mongo = mongoose.mongo; var conn = mongoose.createConnection('mongodb://localhost/mytest'); conn.once('open', function() { console.log('opened connection'); gfs = Grid(conn.db); // all environments app.set('port', process.env.PORT || 3000); app.use(express.logger('dev')); app.use(app.router); // development only if ('development' == app.get('env')) { app.use(express.errorHandler()); } app.get('/', routes.index); http.createServer(app).listen(app.get('port'), function(){ console.log('Express server listening on port ' + app.get('port')); }); });

routes/index.js

exports.index = function(req, res){ res.set('Content-Type', 'image/jpeg'); gfs.createReadStream({ filename: 'receptor.jpg' }).pipe(res); };