node.js - Express multer 上传不起作用

Question

我的 uploader 有问题。我认为所有带有代码的东西都是正确的，但文件仍然没有在上传文件夹中创建。此外，当我尝试 console.log(req.files) 时，我得到一个空数组。我尝试在本地制作这是代码:

const   express = require("express"),
        app = express(),
        multer = require("multer"),
        bodyParser=require("body-parser"),


app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var storage = multer.diskStorage({
    destination: function (req, file, callback) {
        callback(null, './uploads/');
    },
    filename: function (req, file, callback) {
        callback(null, file.fieldname + '-' + Date.now() + '.' + mime.extension(file.mimetype));
    }
});

var upload = multer({ storage : storage }).array('userPic');

app.post("/postFormAct", isLoggedIn, function(req, res){
    upload(req,res,function(err) {
        console.log(req.files);
    });
});

还有我的表格:

<form method="post" action="/postFormAct" enctype="multipart/form-data">
    <input type="text" name="user"><br>
    <input type="text" name="email"><br>
    <input type="file" name="userPic"><br>
    <input type="submit" value="Submit">
</form>

Answer 1

我认为你的功能级中间件有问题，你有 isLoggedIn，你必须像这样立即链接 multer 中间件 upload :

// ...
var upload = multer({ storage : storage }).array('userPic');

app.post("/postFormAct", isLoggedIn, upload, function(req, res){
    console.log(req.files)
});

这是一个完整的工作示例:

const app = require('express')()
const bodyParser = require('body-parser')
const multer = require('multer')
const morgan = require('morgan')

const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, 'uploads')
    },
    filename: (req, file, cb) => {
        cb(null, file.fieldname + '-' + Date.now())
    }
})

const upload = multer({
    storage: storage
})

app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())
app.use(morgan('dev'))

isLoggedIn = (req, res, next) => {
    console.log('check if user is logged in')
    next()
}

app.post('/uploads', isLoggedIn, upload.array('images'), (req, res) => {
    console.log(req.files);
    return res.send(req.files);
})

app.listen(8000, () => {
    console.log(`server is listenning on port 8000`)
})

您可以找到一个测试存储库 here

还要确保您的目标目录存在。