Node.js GridFS+;NodeJS从mongoDB检索图像

Node.js GridFS+;NodeJS从mongoDB检索图像,node.js,mongodb,mongoose,gridfs,gridfs-stream,Node.js,Mongodb,Mongoose,Gridfs,Gridfs Stream,我有以下来自mongoDB的带有图像的JSON,但我不知道如何显示它: fs.chunks: { "_id" : ObjectId("542e684a8a1cec178a172673"), "n" : 1, "data" : BinData(0,"2N6DSSfbCN/LLacNDYrJUQDEZgimMUwFpQGoJP0RU19Bi4PM82DjrUnKhE/P9v7P8ZveD1oDpFBM0iml9NE3WQmAvYFoG+nhD73Jm

我有以下来自mongoDB的带有图像的JSON,但我不知道如何显示它:

fs.chunks:

{
        "_id" : ObjectId("542e684a8a1cec178a172673"),
        "n" : 1,
        "data" : BinData(0,"2N6DSSfbCN/LLacNDYrJUQDEZgimMUwFpQGoJP0RU19Bi4PM82DjrUnKhE/P9v7P8ZveD1oDpFBM0iml9NE3WQmAvYFoG+nhD73Jm4N9b4LpylaAN5Ef+gVdgGSTAfSUwOikXoVick5pSQCkRmTCU5NT9VVfjHdAx74/ZhFRj+TIRjzlAhzkACBElzgMwGCo7tX+FYrpQLJ5KRmXiwFFwsNtHHzXiK1eu+CG1FumhGpA/qdG8CdDgD1xUHEcerMGO/eLGR9ML7ni/VjXxWzqp2j5DG2/WuKNv7xd3Kz/vr0MctJhuaBIl35YrKhdLnzqDa0uDa6bm4jz+eNyAI2hQbayGo4kVPFe8W7wFpY7qfBvnB9kbocxfZSdADDUNwYaydpT8lIcKEN9XfQJOYZvHp0El"),
        "files_id" : ObjectId("542e684a8a1cec178a172671")
}

fs.files:

{
        "_id" : ObjectId("542e65378axdeckhb0"),
        "uploadDate" : ISODate("2012-11-01"),
        "length" : 15673,
        "chunkSize" : 33222,
        "md5" : "f66e6654854a28e3672cfhds334d223b55a1"
}
需要将“数据”转换为真实图像来显示

我使用的是nodeJS,我找不到好的教程来使用GridFS从mongoDB检索图像


谢谢你的帮助

很抱歉,这个答案太晚了,但我很惊讶还没有人回答。无论如何,假设您正在运行Express,下面的代码将下载该文件。您需要将
gfs.findOne()
函数包装到API调用中

const Grid = require('gridfs-stream');
const mime = require('mime');
const mongoose = require('mongoose');

// connect to the db, fill in the username/password/host/port/dbName.
// Ideally the connection is set up before the main part of the app runs.
const path = 'mongodb://username:password@host:port/dbName';
const dbConnection = mongoose.createConnection(path);

const gfs = new Grid(dbConnection.db);

// then once you get the id of the file you want:
gfs.findOne({
    _id: id
}, (err, file) => {
    if (err) {
        // report the error
    } else {
        // detect the content type and set the appropriate response headers.
        let mimeType = file.contentType;
        if (!mimeType) {
            mimeType = mime.lookup(file.filename);
        }
        res.set({
            'Content-Type': mimeType,
            'Content-Disposition': 'attachment; filename=' + file.filename
        });

        const readStream = gfs.createReadStream({
            _id: id
        });
        readStream.on('error', err => {
            // report stream error
        });
        // the response will be the file itself.
        readStream.pipe(res);
    }
});

我收到一个错误:UnhandledPromisejectionWarning:TypeError:cursor.nextObject不是function@SheeceGardazi你能链接到你的代码吗?如果没有,我建议将您的问题作为单独的问题发布。添加以下内容:eval(
Grid.prototype.findOne=${Grid.prototype.findOne.toString().replace('nextObject','next')}
);解决了我的问题,我在这里添加了解决方案,我可能会在接下来的几周内更新我的答案,因为MongoDB已经有了官方版本,gridfs stream的所有者已经停止了开发。