nodejs分片上传前后端文件处理
前端代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="file" id="file">
<img alt="加载中" id="src">
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.js"></script>
<script>
var file = document.getElementById('file')
file.onchange = function (e) {
var img = document.getElementById('src')
var base = new FileReader()
console.log(e.target.files[0])
var all = e.target.files[0]
var size = e.target.files[0].size / 10
var init = 0
var arr = []
var index = 0
while (init < e.target.files[0].size) {
arr.push(all.slice(init, init + size))
init = init + size
}
console.log(arr)
arr.map((res, index) => {
const form = new FormData()
form.append('file', res)
axios({
url: 'http://localhost:4000/upla?name=' + index + '&size=' + 9,
method: 'post',
data: form
}).then(res => {
console.log(res)
if (res.data.ok === 200) {
axios({
url: 'http://localhost:4000/merge?name=' + e.target.files[0].name,
method: 'get'
}).then(suc => {
console.log(suc)
img.setAttribute('src',suc.data.url)
})
}
})
})
----------------------------
// var name = e.target.files[0].name
// var type = e.target.files[0].type
// base.readAsDataURL(new Blob([e.target.files[0]]))
// base.onload = function (e) {
// const base64 = atob(e.target.result.split(',')[1])
// const buffer = new ArrayBuffer(base64.length) // 创建缓存视图
// const u8 = new Uint8Array(buffer) // 将缓存视图 赋值 字节流数组 来 创建一个模板数组
// for(let i =0;i<=base64.length-1;i++) {
// u8[i] = base64.charCodeAt(i)
// }
// // console.log(u8)
// // console.log(new Blob([u8],{type: 'image/jpg'}))
-----------------------------------base64转化blob
// // const u8 = new Uint8Array(base64.length) // 将缓存视图 赋值 字节流数组 来 创建一个模板数组
// // for (let i = base64.length - 1; i >= 0; i--) {
// // u8[i] = base64.charCodeAt(i)
// // }
// console.log(u8)
// const fil = new File([u8], name, {
// [Uint8Array]是格式必须
// type: type
// })
// console.log(fil)
----------------------------------base64转化文件对象
// const from = new FormData()
// from.append('file', fil)
// // axios({
// // url: 'http://localhost:4000/upla',
// // method: 'post',
// // data: from
// // }).then(res => {
// // console.log(res)
// // })
// }
}
</script>
</body>
</html>
后端代码
后端文件目录
var express = require('express')
var crypto = require('./crypto')
var app = express()
var path = require('path')
var fs = require('fs')
var multiparty = require('multiparty')
app.use('/css', express.static('./public/css'))
app.use('/js', express.static('./public/js'))
app.use('/img', express.static('./public/img'))
app.use('/fonts', express.static('./public/fonts'))
app.all('*', function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Methods", "GET,HEAD,OPTIONS,POST,PUT");
res.header("Access-Control-Allow-Headers", "token,name,age,Origin, X-Requested-With, Content-Type, Accept, Authorization");
res.header('X-Powered-By', '123')
res.header('Access-Control-Expose-Headers', 'setcookie,X-Powered-By')
next();
});
app.use('/upla', (req, res) => { // 接收文件上传
let form = new multiparty.Form({
uploadDir: './public/merge' //指定上传的文件路径
});
let imgName = req.query.name
let size = req.query.size
form.parse(req, (err, field, files) => {
files && files.file.map(x => { // 必须这样写
let img = imgName || x.originalFilename
fs.rename(x.path, './public/merge/' + img, () => {
if (size === imgName) {
res.json({ok:200}) // 判断分片全部完成
} else {
res.end(JSON.stringify({
ok: 304
}))
}
})
})
})
form.on('field', (name, value) => {
// name:字段名
// value:值
console.log('数据:', name, value);
})
//接收文件数据
form.on('file', (name, file) => {
console.log('文件:', name, file);
})
//表单解析完成
form.on('close', () => {
console.log('完成');
})
})
app.get('/merge', (req, res) => {
// 触发上个分片接口成功回调发送请求
let filePath = './public/img/' + req.query.name
fs.readdir('./public/merge', (err, list) => {
console.log(list)
list.map(res => {
fs.appendFileSync(filePath, fs.readFileSync('./public/merge/' + res)); // 读取返回结果 然后追加路径
fs.unlinkSync('./public/merge/' + res) // 删除分片
})
res.json({
url: `http://localhost:4000/img/${req.query.name}`
})
})
})
app.use('/demo', (req, res) => {
res.json({
ok: 200
})
})
app.listen(4000, () => {
console.log('服务开启')
})