首先npm install下载需要的模块
mongo中fs.files中有字段filesname,metadata,利用metadata作为文档的分类
var mongoose = require('mongoose');var conn = mongoose.createConnection('mongodb://127.0.0.1:27017/NodeJS');var fs = require('fs');var Grid = require('gridfs-stream'); Grid.mongo = mongoose.mongo;var gfs = Grid(conn.db);var path = require('path');var util = require('util');var urlencode = require('urlencode');var mongooseSchema = new mongoose.Schema({ filename: String, metadata: String, aliases: String}, {collection: "fs.files", versionKey: ""});var getFile = conn.model('getFile', mongooseSchema);var fileUpload = {};
//根据metadata列出存mongo里的filenamefileUpload.findAllFiles = function (httpId, callback) { getFile.find({metadata: httpId}, {"filename": '1'}, function (err, docs) { if (err) { callback(err); } else { callback(null, docs); } }) };
//将文档存到mongo中fileUpload.loadToMongo = function (name,httpId,callback) { var writestream = gfs.createWriteStream({ filename: name, metadata:httpId }); fs.createReadStream(files).pipe(writestream); writestream.on('close', function (file) { }); };//通过filename从mongo中将文档下载到磁盘中fileUpload.readFile = function (dir, name, callback) { var fs_write_stream = fs.createWriteStream("documents/" + dir + "/" + name); var readstream = gfs.createReadStream({ filename: name }); readstream.pipe(fs_write_stream); fs_write_stream.on('close', function () { callback(null); }); }; 原文：http://blog.csdn.net/u012437323/article/details/55253706
