Question

使用multer和express上传文件时出现此错误。我尝试了所有操作，最近我编写了相同的代码，但现在无法正常工作。

App.js

我仅在上载路由器中有问题，如果我注释了上载路由器声明，则服务器将运行。

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var session = require('express-session');
var FileStore = require('session-file-store')(session);
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var config = require('./config.js');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var productRouter = require('./routes/productRouter');
var cartRouter = require('./routes/cartRouter');
var uploadRouter = require('./routes/uploadRouter');
var app = express();
var passport = require('passport');
var authenticate = require('./authenticate');
const mongoose = require('mongoose');
const url = config.mongoUrl;
const connect = mongoose.connect(url);

connect.then((db) => {
    console.log("Connected correctly to server");
}, (err) => { console.log(err); });
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(passport.initialize());
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use(express.static(path.join(__dirname, 'public')));
app.use('/imageUpload', uploadRouter);
app.use('/products', productRouter);
app.use('/cart', cartRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

UploadRouter.js：

const express = require('express');
const bodyParser = require('body-parser');
const authenticate = require('../authenticate');
const multer = require('multer');
// const cors = require('./cors');
const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, 'public/images');
    },

    filename: (req, file, cb) => {
        cb(null, file.originalname)
    }
});

const imageFileFilter = (req, file, cb) => {
    if(!file.originalname.match(/\.(jpg|jpeg|png|gif)$/)) {
        return cb(new Error('You can upload only image files!'), false);
    }
    cb(null, true);
};

const upload = multer({ storage: storage, fileFilter: imageFileFilter});

const uploadRouter = express.Router();

uploadRouter.use(bodyParser.json());

uploadRouter.route('/')
.options(cors.corsWithOptions, (req, res) => { res.sendStatus(200); })
.get(authenticate.verifyUser, authenticate.verifyAdmin, (req, res, next) => {
    res.statusCode = 403;
    res.end('GET operation not supported on /imageUpload');
})
.post(cors.corsWithOptions, authenticate.verifyUser, authenticate.verifyAdmin, upload.single('imageFile'), (req, res) => {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'application/json');
    res.json(req.file);
})
.put(cors.corsWithOptions, authenticate.verifyUser, authenticate.verifyAdmin, (req, res, next) => {
    res.statusCode = 403;
    res.end('PUT operation not supported on /imageUpload');
})
.delete(cors.corsWithOptions, authenticate.verifyUser, authenticate.verifyAdmin, (req, res, next) => {
    res.statusCode = 403;
    res.end('DELETE operation not supported on /imageUpload');
});

module.exports = uploadRouter;

知道为什么会这样。

Route.get（）需要回调函数，但在Route。（匿名函数）处有一个[object Undefined]。

0 个答案: