koa2文件上传

创建项目目录

mkdir uploadFile
cd uploadFile

初始化项目

git init
npm init

安装依赖

npm install koa koa-router koa-body koa-static

项目主程序 app.js

const Koa = require('koa');
const koaBody = require('koa-body');
const Router = require('koa-router');
const static = require('koa-static');
const cors = require('koa2-cors')
const fs = require('fs');
const path = require('path');

const hostname = '127.0.0.1'
const port = 3000

const app = new Koa()
const router = new Router()

app.use(cors())
app.use(static('.'));

router
    .get('/', (ctx, next) => {
        ctx.body = 'hello world!'
    })
    .post('/api/upload', koaBody({
        multipart: true,
        formidable: {
        }
    }), (ctx, next) => {
        let file = ctx.request.files.file
        let fileType = file.name.split('.').pop()
        let fileName = `${Date.now()}.${fileType}`
        let fileReader = fs.createReadStream(file.path)
        let writeStream = fs.createWriteStream(path.join(__dirname, 'upload', `${fileName}`))

        fileReader.pipe(writeStream)
        ctx.body = {
            code: 0,
            message: '上传成功',
            url: `http://${hostname}:${port}/upload/${fileName}`
        }
    })

app
    .use(router.routes())
    .use(router.allowedMethods())

app.listen(port, hostname, () => {
    console.log(`Server running at http://${hostname}:${port}/`);
})