vue2实现文件分片上传/续传

两种上传文件方式一种分片和续传
工具包
/assets/utils.js

export function fileParse(file, type = "base64") {
return new Promise(resolve => {
let fileRead = new FileReader();
if (type === "base64") {
fileRead.readAsDataURL(file);
} else if (type === "buffer") {
fileRead.readAsArrayBuffer(file);
}
fileRead.onload = (ev) => {
resolve(ev.target.result);
};
});
};

第一种文件上传（直接上传文件，这里的文件都以图片为例）
<template>
<div id="app">
<!--
action:存放的是文件上传到服务器的接口地址
-->
<el-upload
drag
action="/single1"
:show-file-list="false"
:on-success="handleSuccess"
:before-upload="beforeUpload"
>
<i class="el-icon-upload"></i>
<div class="el-upload__text">
将文件拖到此处，或
<em>点击上传</em>
</div>
</el-upload>

<!-- IMG -->
<div class="uploadImg" v-if="img">
<img :src="img" alt />
</div>
</div>
</template>

<script>
/*
* 文件上传有两套方案：
* 1. 基于文件流（form-data） element-ui上传组件默认是基于文件流的
* 2. 客户端需要把文件转化为BASE64
*
* 默认上传
* 格式：multipart/form-data
* 数据格式：form-data
* file 文件流信息
* filename 文件名字
* 上传成功后获取服务器返回信息，通知on-success回调函数执行
* 内部封装了ajax
*/
export default {
name: "App",
data() {
return {
img: null,
};
},
methods: {
handleSuccess(result) {
if (result.code == 0) {
this.img = result.path;
}
},
beforeUpload(file) {
// 格式校验
let { type, size } = file;

if (!/(png|gif|jpeg|jpg)/i.test(type)) {
this.$message("文件合适不正确~~");
return false;
}

if (size > 200 * 1024 * 1024) {
this.$message("文件过大，请上传小于200MB的文件~~");
return false;
}

return true;
},
},
};
</script>

第二种文件上传（上传文件的buffer格式(图片可以base64格式)，这里的文件都以图片为例）
<template>
<div id="app">
<el-upload drag action :auto-upload="false" :show-file-list="false" :on-change="changeFile">
<i class="el-icon-upload"></i>
<div class="el-upload__text">
将文件拖到此处，或
<em>点击上传</em>
</div>
</el-upload>

<!-- IMG -->
<div class="uploadImg" v-show="img">
<img :src="img" alt />
</div>
</div>
</template>

<script>
import { fileParse } from "./assets/utils";
import axios from "axios";
import qs from "qs";

export default {
name: "App",
data() {
return {
img: null,
};
},
methods: {
async changeFile(file) {
if (!file) return;
file = file.raw;
// 继续做格式校验
/*
* 把上传的文件先进行解析（FileReader）
* 把其转换base64编码格式
* 自己基于axios把信息传递给服务器
* ...
*/
let result = await fileParse(file, "base64");
result = await axios.post(
"/single2",
qs.stringify({
chunk: encodeURIComponent(result),
filename: file.name,
}),
{
headers: {
"Content-Type": "application/x-www-form-urlencoded",
},
}
);
result = result.data;
if (result.code == 0) {
this.img = result.path;
}
},
},
};
</script>

文件分片/续传
<template>
<div id="app">
<el-upload drag action :auto-upload="false" :show-file-list="false" :on-change="changeFile">
<i class="el-icon-upload"></i>
<div class="el-upload__text">
将文件拖到此处，或
<em>点击上传</em>
</div>
</el-upload>

<!-- PROGRESS -->
<div class="progress">
<span>上传进度：{{total|totalText}}%</span>
<el-link type="primary" v-if="total>0 && total<100" @click="handleBtn">{{btn|btnText}}</el-link>
</div>

<!-- VIDEO -->
<div class="uploadImg" v-if="video">
<video :src="video" controls />
</div>
</div>
</template>

<script>
import { fileParse } from "./assets/utils";
import axios from "axios";
import SparkMD5 from "spark-md5";

export default {
name: "App",
data() {
return {
total: 0,
video: null,
btn: false,
};
},
filters: {
btnText(btn) {
return btn ? "继续" : "暂停";
},
totalText(total) {
return total > 100 ? 100 : total;
},
},
methods: {
async changeFile(file) {
if (!file) return;
file = file.raw;

// 解析为BUFFER数据
// 我们会把文件切片处理：把一个文件分割成为好几个部分（固定数量/固定大小）
// 每一个切片有自己的部分数据和自己的名字
// HASH_1.mp4
// HASH_2.mp4
// ...
let buffer = await fileParse(file, "buffer"),
spark = new SparkMD5.ArrayBuffer(),
hash,
suffix;
spark.append(buffer);
hash = spark.end();
suffix = /\.([0-9a-zA-Z]+)$/i.exec(file.name)[1];

// 创建100个切片
let partList = [],
partsize = file.size / 100,
cur = 0;
for (let i = 0; i < 100; i++) {
let item = {
chunk: file.slice(cur, cur + partsize),
filename: `${hash}_${i}.${suffix}`,
};
cur += partsize;
partList.push(item);
}

this.partList = partList;
this.hash = hash;
this.sendRequest();
},
async sendRequest() {
// 根据100个切片创造100个请求（集合）
let requestList = [];
this.partList.forEach((item, index) => {
// 每一个函数都是发送一个切片的请求
let fn = () => {
let formData = new FormData();
formData.append("chunk", item.chunk);
formData.append("filename", item.filename);
return axios
.post("/single3", formData, {
headers: { "Content-Type": "multipart/form-data" },
})
.then((result) => {
result = result.data;
if (result.code == 0) {
this.total += 1;
// 传完的切片我们把它移除掉
this.partList.splice(index, 1);
}
});
};
requestList.push(fn);
});

// 传递：并行(ajax.abort())/串行(基于标志控制不发送)
let i = 0;
let complete = async () => {
let result = await axios.get("/merge", {
params: {
hash: this.hash,
},
});
result = result.data;
if (result.code == 0) {
this.video = result.path;
}
};
let send = async () => {
// 已经中断则不再上传
if (this.abort) return;
if (i >= requestList.length) {
// 都传完了
complete();
return;
}
await requestList[i]();
i++;
send();
};
send();
},
handleBtn() {
if (this.btn) {
//断点续传
this.abort = false;
this.btn = false;
this.sendRequest();
return;
}
//暂停上传
this.btn = true;
this.abort = true;
},
},
};
</script>

服务端代码(nodejs)
/*-CREATE SERVER-*/
const express = require('express'),
app = express(),
bodyParser = require('body-parser'),
fs = require('fs'),
SparkMD5 = require('spark-md5'),
PORT = 8888;
app.listen(PORT, () => {
console.log(`THE WEB SERVICE IS CREATED SUCCESSFULLY AND IS LISTENING TO THE PORT：${PORT}`);
});
app.use(bodyParser.urlencoded({
extended: false,
limit: '1024mb'
}));

/*-API-*/
const multiparty = require("multiparty"),
uploadDir = `${__dirname}/upload`;

function handleMultiparty(req, res, temp) {
return new Promise((resolve, reject) => {
// multiparty的配置
let options = {
maxFieldsSize: 200 * 1024 * 1024
};
!temp ? options.uploadDir = uploadDir : null;
let form = new multiparty.Form(options);
// multiparty解析
form.parse(req, function (err, fields, files) {
if (err) {
res.send({
code: 1,
reason: err
});
reject(err);
return;
}
resolve({
fields,
files
});
});
});
}

// 基于FORM-DATA上传数据
app.post('/single1', async (req, res) => {
let {
files
} = await handleMultiparty(req, res);
let file = files.file[0];
res.send({
code: 0,
originalFilename: file.originalFilename,
path: file.path.replace(__dirname, `http://127.0.0.1:${PORT}`)
});
});

// 上传BASE64
app.post('/single2', (req, res) => {
let {
chunk,
filename
} = req.body;

// chunk的处理：转换为buffer
chunk = decodeURIComponent(chunk);
chunk = chunk.replace(/^data:image\/\w+;base64,/, "");
chunk = Buffer.from(chunk, 'base64');

// 存储文件到服务器
let spark = new SparkMD5.ArrayBuffer(),
suffix = /\.([0-9a-zA-Z]+)$/.exec(filename)[1],
path;
spark.append(chunk);
path = `${uploadDir}/${spark.end()}.${suffix}`;
fs.writeFileSync(path, chunk);
res.send({
code: 0,
originalFilename: filename,
path: path.replace(__dirname, `http://127.0.0.1:${PORT}`)
});
});

// 切片上传 && 合并
app.post('/single3', async (req, res) => {
let {
fields,
files
} = await handleMultiparty(req, res, true);

let [chunk] = files.chunk,
[filename] = fields.filename;
let hash = /([0-9a-zA-Z]+)_\d+/.exec(filename)[1],
// suffix = /\.([0-9a-zA-Z]+)$/.exec(file.name)[1],
path = `${uploadDir}/${hash}`;
!fs.existsSync(path) ? fs.mkdirSync(path) : null;
path = `${path}/${filename}`;
fs.access(path, async err => {
// 存在的则不再进行任何的处理
if (!err) {
res.send({
code: 0,
path: path.replace(__dirname, `http://127.0.0.1:${PORT}`)
});
return;
}

// 为了测试出效果，延迟1秒钟
await new Promise(resolve => {
setTimeout(_ => {
resolve();
}, 200);
});

// 不存在的再创建
let readStream = fs.createReadStream(chunk.path),
writeStream = fs.createWriteStream(path);
readStream.pipe(writeStream);
readStream.on('end', function () {
fs.unlinkSync(chunk.path);
res.send({
code: 0,
path: path.replace(__dirname, `http://127.0.0.1:${PORT}`)
});
});
});
});

app.get('/merge', (req, res) => {
let {
hash
} = req.query;

let path = `${uploadDir}/${hash}`,
fileList = fs.readdirSync(path),
suffix;
fileList.sort((a, b) => {
let reg = /_(\d+)/;
return reg.exec(a)[1] - reg.exec(b)[1];
}).forEach(item => {
!suffix ? suffix = /\.([0-9a-zA-Z]+)$/.exec(item)[1] : null;
fs.appendFileSync(`${uploadDir}/${hash}.${suffix}`, fs.readFileSync(`${path}/${item}`));
fs.unlinkSync(`${path}/${item}`);
});
fs.rmdirSync(path);
res.send({
code: 0,
path: `http://127.0.0.1:${PORT}/upload/${hash}.${suffix}`
});
});

app.use(express.static('./'));
app.use((req, res) => {
res.status(404);
res.send('NOT FOUND!');
});

参考文章：http://blog.ncmem.com/wordpress/2023/12/08/vue2%e5%ae%9e%e7%8e%b0%e6%96%87%e4%bb%b6%e5%88%86%e7%89%87%e4%b8%8a%e4%bc%a0-%e7%bb%ad%e4%bc%a0/

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