multer 的使用

index.js 文件

const express = require('express');
const bodyParser = require('body-parser');
const path = require('path');
const { multer } = require('./model/multer');

const app = express();


app.use(express.static('static'));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());


// 单文件处理
app.post('/upload', multer().single('img'), (req, res, next) => {
  var body = req.body;
  console.log(req);
  const basename = path.basename(req.file.path)
  res.send({
    body: req.body,
    file: req.file
  });
})


// 多文件处理
const cpUpload = multer().fields([{ name: 'img1', maxCount: 1 }, { name: 'img2', maxCount: 8 }]);
app.post('/uploads', cpUpload, (req, res) => {
  res.send({
    body: req.body,
    files: req.files
  });
})

app.listen(3001, () => {
  console.log('服务运行与3001端口');
})

multer 文件

const multer = require('multer');
const path = require('path');
const mkdirp = require('mkdirp')
const sd = require('silly-datetime');

module.exports = {
  multer() {
    // 存储对象
    var storage = multer.diskStorage({
      destination: function (req, file, cb) {
        const date = sd.format(Date.now(), "YYYY-MM-DD");
        const dir = path.join('static/upload', date);
        
        new Promise((resolve, reject) => {
          mkdirp(dir);
          resolve();
        }).then(() => {
          cb(null, dir);
        }).catch(err => {
          console.log('创建上传目录失败：' + err.message);
        })
        
        
      },
      // 修改上传文件名
      filename: function (req, file, cb) {
        // 获取原来上传文件的后缀名
        const extname = path.extname(file.originalname);

        cb(null, Date.now() + extname)
      }
    });
    
    const upload = multer({
      storage: storage
    });

    return upload;
  }
}