Express使用二

const http = require('http') const fs = require('fs')

// 创建一个服务器
const server = http.createServer((req, res) => {
// 设置为二进制格式数据
req.setEncoding('binary')

const boundary = req.headers['content-type'].split('; ')[1].replace('boundary=', '')

// 因为客户端传递的数据是表单数据(请求体)
let formData = ''
req.on('data', (data) => {
console.log(data)
formData += data
})

req.on('end', () => {
console.log(formData)
const imgType = 'image/png'
const position = formData.indexOf(imgType) + imgType.length
let imageData = formData.substring(position)

    // imageData开始位置会有两个空格
    imageData = imageData.replace(/^\s\s*/, '')

    // 替换最后的 boundary
    imageData = imageData.substring(0, imageData.indexOf(`--${boundary}--`))

    fs.writeFile('./client.png', imageData, 'binary', () => {
      console.log('文件上传成功')
      res.end('文件上传完毕')
    })

})
})

server.listen(3000, () => {
console.log('localhost:3000 server success')
})

const express = require('express')
const multer = require('multer')

const app = express()
const port = 3000

// 注意最后生成的文件是可以浏览的，但是windows电脑上可能会因为没有后缀格式而无法查看，mac可以直接查看
// vscode中同样会因为没有后缀无法查看，可以手动添加后缀查看

// 使用一个 express 官方的中间件
const upload = multer({
  storage: multer.diskStorage({
    destination(req, file, callback) {
      callback(null, './uploads')
    },
    filename(req, file, callback) {
      callback(null, Date.now() + '_' + file.originalname)
    },
  }),
})
// 单文件上传  singer()
// upload.single(文件名) 客户端请求时文件的 key 值
app.post('/upload', upload.single('avatar'), (req, res, next) => {
  console.log(req.file)

  res.send('Hello World!')
})

app.post('/upload_files', upload.array('photos'), (req, res, next) => {
  console.log(req.files)

  res.send('上传成功!')
})

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

const Koa = require('koa')
const KoaRouter = require('@koa/router')
const multer = require('@koa/multer')

const app = new Koa()
const files = multer({
  storage: multer.diskStorage({
    destination(req, file, callback) {
      callback(null, './uploads')
    },
    filename(req, file, callback) {
      callback(null, Date.now() + '_' + file.originalname)
    },
  }),
})

const userRouter = new KoaRouter({ prefix: '/upload' })

// 单文件
userRouter.post('/file', files.single('avatar'), (ctx, next) => {
  console.log(ctx.request.file)

  ctx.body = 'form数据上传成功'
})

// post/form-data(file)
// 多文件
userRouter.post('/files', files.array('avatar'), (ctx, next) => {
  console.log(ctx.request.files)

  ctx.body = 'form数据上传成功'
})

app.use(userRouter.routes())
app.use(userRouter.allowedMethods())

app.listen(8000, () => {
  console.log('Koa server successfully listening')
})