nodejs文件上传获进度

[gaowei1012]

在写nodejs是常常会碰到上穿文件获取长传文件进度这样的需求，这里我们以express框架为例：

• multter 上传文件中间件 github
• progress-stream 获取上传文件进度中间件 github

这里直接上源码

const fs = require('fs')
const express = require('express')
const multer = require('multer')
const progressStream = require('progress-stream')

const app = express()
let upload = multer({dest: 'upload/'})

app.get('/upload', function (req, res, next) {
	// 创建progress-stream 实例
	let progress = progressStream({length: '0'})
	req.pipe(progress)
	progress.headers = req.headers

	// 获取上传文件真实长度
	progress.on('length', function nowIKonwMyLength(actualLength) {
		console.log('actualLength', actualLength)
		progress.setLength(actualLength)
	})

	// 获取长传进度
	progress.on('progress', function (obj) {
		console.log(obj.percentage)
	})

	// 实际上传文件
	upload.single('logo')(progress, res, next)
})

app.post('/upload', function (req, res, next) {
	res.send({ret_code: '0'})
})

app.get('/form', function (req, res, next) {
	let form = fs.readFileSync('./test.text', {encoding: 'utf8'})
	res.send(form)
})

app.listen(8090)