expressjs文件上传,检查是否确实发送了文件,指定max filesize并保留其名称

npm install multer busboy

const express = require('express');
const multer = require('multer');
const busboy = require('busboy');
const app = express();

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, './uploads/');
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname);
  }
});

const upload = multer({
  storage: storage,
  limits: {
    fileSize: 1024 * 1024 * 5 // 限制文件大小为5MB
  }
});

app.post('/upload', upload.single('file'), (req, res) => {
  if (!req.file) {
    return res.status(400).send('No file uploaded.');
  }
  res.status(200).send(`File uploaded successfully: ${req.file.originalname}`);
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});