13

我正在尝试在我的 app.js 文件(使用 node.js/express)中配置 multer,以允许用户上传图像。我在 app.js 中有以下代码:

//various require statements for passport, cookie parser, etc..

var multer = require('multer');

var app = express();

app.use(multer({dest:'./uploads/'}));

当我尝试运行应用程序时,我得到TypeError: app.use() requires middleware functions

我知道这个问题可能需要更多关于我的应用的背景信息,所以如果需要更多信息,请告诉我。

谢谢

编辑:来自 app.js 的更多代码:

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var session = require('express-session');
//var fs = require('fs');
var multer = require('multer');

//Mongo Database
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/test-api');

//Instagram-API
var api = require('instagram-node').instagram();

//Cookie Manager
var cookieParser = require('cookie-parser');

//Grid
//var Grid = require('gridfs-stream');

//Passport
var passport = require('passport');
var InstagramStrategy = require('passport-instagram').Strategy;

var routes = require('./routes/index');
//var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(multer({dest:'./uploads/'}));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(methodOverride());
app.use(session({secret: 'keyboard cat', resave: false, saveUninitialized: true }));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.static(path.join(__dirname, 'public')));


// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

app.use('/', routes);
4

3 回答 3

20

问题是multer({dest:'./uploads/'})返回对象,而不是中间件函数。如果我们查看代码模块,我们会看到有三个中间件函数:

multer({dest:'./uploads/'}).single(...)
multer({dest:'./uploads/'}).array(...)
multer({dest:'./uploads/'}).fields(...)

尝试其中之一。

于 2015-07-18T21:33:44.793 回答
11

感谢@stdob——引导我朝着正确的方向前进。我正在查看的 multer 文档似乎在我工作时已更新,因此我错误地使用了代码。

Multer 应该与它的中间件功能一起使用。因此,使用此包的正确方法如下:

var multer = require('multer');

var upload = multer({dest:'uploads/'});

var cpUpload = upload.single('postImg');

router.post('/createpost', cpUpload, function(req,res){

  console.log(req.file);
  res.redirect('/');

}

此代码片段将为“/createpost”创建一个发布路径,并将单个文档(通过表单名称“postImg”)上传到服务器中的/uploads。req.file包含带有文件信息(如文件路径)的 JSON。请记住,这不会自动删除上传的文件。

更多信息可以在这里找到:https ://www.npmjs.com/package/multer

于 2015-07-18T22:35:52.927 回答
4

这会做

app.use(multer({dest:'./public/images/uploads'}).any());
于 2016-09-16T17:55:42.567 回答