网站域名分几种关键词歌词打印

前端上传大文件、视频的时候会出现超时、过大、很慢等情况，为了解决这一问题，跟后端配合做了一个切片的功能。

我这个切片功能是基于 minion 的，后端会把文件放在minion服务器上。具体看后端怎么做

1、在项目的 util(这个文件夹是自己创建的，如果项目里没有可以自行创建) 文件家中创建一个js文件 upload.js   在js文件中添加如下代码：

import axios from 'axios';
import md5 from 'js-md5' //引入MD5加密
export const uploadByPieces = ({ urlList, file, pieceSize, progress, beforeSuccess, success, error }) => {// 如果文件传入为空直接 return 返回if (!file) returnlet fileMD5 = ''// 总文件列表const chunkSize = pieceSize * 1024 * 1024 // 5MB一片const chunkCount = Math.ceil(file.size / chunkSize - 1) // 总片数// 获取md5const readFileMD5 = () => {// 读取视频文件的md5// console.log("获取文件的MD5值")let fileRederInstance = new FileReader()// console.log('file', file)fileRederInstance.readAsBinaryString(file)fileRederInstance.addEventListener('load', e => {let fileBolb = e.target.resultfileMD5 = md5(fileBolb)// console.log('fileMD5', fileMD5)// console.log("文件未被上传，将分片上传")readChunkMD5()})}const getChunkInfo = (file, currentChunk, chunkSize) => {let start = currentChunk * chunkSizelet end = Math.min(file.size, start + chunkSize)let chunk = file.slice(start, end)return { start, end, chunk }}// 针对每个文件进行chunk处理const readChunkMD5 = () => {// 针对单个文件进行chunk上传for (var i = 0; i < chunkCount; i++) {const { chunk } = getChunkInfo(file, i, chunkSize)// console.log("切片地址123" + urlList)// console.log("总片数" + chunkCount)// console.log("分片后的数据---测试：" + i)// console.log(chunk)let fileUrl = urlList[i];// console.log(fileUrl,'地址');uploadChunk({ chunk, currentChunk: i, chunkCount, fileUrl })}}const uploadChunk = (chunkInfo) => {// 上传请求方式1 (根据自身情况自行选择)// console.log(chunkInfo.chunk,'chunkInfochunkInfo');let files = chunkInfo.chunkaxios.put(chunkInfo.fileUrl,files).then((res) => {// console.log("分片上传返回信息："+ res)if (res.status == 200) {// 下面如果在项目中没有用到可以不用打开注释if (chunkInfo.currentChunk < chunkInfo.chunkCount - 1) {beforeSuccess()} else {// 当总数大于等于分片个数的时候if ((chunkInfo.currentChunk + 1) == chunkInfo.chunkCount) {// console.log("文件开始------合并成功")success(res.data[0])}}}}).catch((e) => {console.log('失败！');error && error(e)})}readFileMD5() // 开始执行代码
}

js-md5 如果没有的话需要自己在项目里安装：

npm install js-md5

2、创建一个上传视频文件的公共组件，便于不同地方引用，如下：

<template><div class="container" style="display:inline-block;width: 200px;"><el-uploadclass="upload-demo"action="#":multiple="false":auto-upload="false"accept=".mp4":on-change="handleChange":show-file-list="false"><el-button slot="trigger" size="small" type="primary" :disabled="isUploadVideo">选择视频</el-button><!-- <el-button size="small" type="primary" @click="uploadVideo()" style="margin-left: 10px;">开始上传</el-button> --></el-upload><!-- 进度条 --><el-progress v-if="progressFlag" :percentage="loadProgress"></el-progress></div>
</template><script>
import {mapGetters} from "vuex"; 
import { uploadByPieces } from '@/util/upload-video'
import api from "@/api/mes2/index-lhj"
export default {data() {return {isUploadVideo: false,uploadId: '', // 切片视频的唯一id(后端返回)fileNameVal: '', // 文件名称(后端返回)listUrl: [], // 切片路径集合loadProgress: 0, // 动态显示进度条progressFlag: false, // 关闭进度条}},created(){},computed: {   ...mapGetters(["userInfo"]),   }, props:{paramsData: {type: Object,default: {}}},methods: {// 选择视频handleChange(file, fileList) {this.isUploadVideo = true;this.progressFlag = true; // 显示进度条this.loadProgress = 10; // 动态获取文件上传进度let fileSizeVal = file.size / 1024 / 1024;let numVal = null;if(fileSizeVal <= 20){numVal = 1;}else{numVal = Math.ceil(file.size / (10 * 1024 * 1024));}let params = {fileName: file.name,partCount: numVal - 1,tenantId: this.userInfo.tenant_id,fileType: "mp4",fileSize: file.size,sourceId: this.paramsData.id,sourceType: this.paramsData.inspectionType,sourceSystem: "MES2",hierarchyCode:"MES2"}api.queryUploadBigFileUrl(params).then((res) => {this.loadProgress = 20;this.listUrl = res.data.data.partUrlList;this.uploadId = res.data.data.uploadId;this.fileNameVal = res.data.data.fileName// 调用切片方法uploadByPieces({urlList: this.listUrl,file: file.raw, // 视频实体pieceSize: 10, // 分片大小beforeSuccess: data => {// 进度数 / 切片总数let progress = Math.floor(70 / (numVal - 1)); // 计算进度this.loadProgress += progress;},success: data => {// console.log('分片上传视频成功', data)this.getFileAll(numVal)},error: e => {console.log('分片上传视频失败', e)this.$message.error('视频切片上传失败，请重新上传！')this.progressFlag = false}})}).catch(() => {this.$message.error('发生错误，请重新上传！')this.progressFlag = false})},// 整合切片文件getFileAll(numVal){let params = {partCount: numVal - 1,tenantId: this.userInfo.tenant_id,uploadId: this.uploadId,fileName: this.fileNameVal,}this.loadProgress = 95;api.queryUploadBigFile(params).then((res) => {if(res.data.data === false){this.isUploadVideo = false;this.$message.error('视频切片合并失败，请重新上传！')setTimeout( () => {this.progressFlag = false}, 1000) // 一秒后关闭进度条}else{this.loadProgress = 100;this.isUploadVideo = false;this.$message.success('视频上传成功！')this.$emit('uploadVideoData');if (this.loadProgress >= 100) {this.loadProgress = 100setTimeout( () => {this.progressFlag = false}, 1000) // 一秒后关闭进度条}}}).catch(() => {this.isUploadVideo = false;this.$message.error('视频合并上传失败，请重新上传！')})},},
}
</script><style scoped lang="scss"></style>

具体根据自己的实际情况进行修改即可！

至此完成！！！

测试有效！！！感谢支持！！！