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Vue Element UI + OSS实现上传文件功能

2019-11-19 11:05:50
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Element提供了upload上传组件,可以查看官网upload组件的详细介绍;查看upload组件的上传源码upload/ajax,使用的是XHR对象上传文件。在项目实践中,发现该上传方法上传大文件时会出现问题,所以决定使用阿里云对象存储服务(Object Storage Service,简称OSS),OSS详细介绍可以查看官网,本文主要讲解的是OSS上传文件的前端,后台开发请查看官网介绍,SDK Browser.js讲解了前端如何进行上传。

1、使用npm安装SDK的开发包:

npm install ali-oss

2、OSS配置

let OSS = require('ali-oss');let client= new OSS.Wrapper({ accessKeyId: 'your access key', accessKeySecret: 'your access secret', bucket: 'your bucket name', region: 'oss-cn-hangzhou'});

最新版的没有了Wrapper构造函数,直接配置

let oss = require('ali-oss');var client = oss({ accessKeyId: 'your access key', accessKeySecret: 'your access secret', bucket: 'your bucket name', region: 'oss-cn-hangzhou'});

3、上传文件

OSS上传文件分为上传Buffer内容、上传blob数据、分片上传,此处展示分片上传

let result = await client.multipartUpload('object-key', 'local-file', { progress: async function (p) {  console.log('Progress: ' + p); } });

js调用OSS上传文件已经没有问题,但是我们需要实现公用上传组件,Element UI已经实现了Upload上传组件,包括上传进度、异常处理、拖拽等;那我们还有必要重新开发一个像Upload一样的组件吗?通过查看Upload组件的API发现有一个http-request属性,http-request覆盖默认的上传行为,可以自定义上传的实现;看到这个我就省了很多事,直接用OSS上传覆盖XHR上传。代码如下:

<template> <div> <el-upload  :auto-upload="false"  :action="uploadUrl"  ref="upload"  :before-upload="fnBeforeUpload"  :on-success="fnUploadSuccess"  :on-exceed="fnUploadExceed"  :data="data_extra"  :headers="uploadHeaders"  :http-request="fnUploadRequest"  drag  :limit="files"  :disabled="disabled"  multiple>  <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>  <div slot="tip" class="el-upload__tip">上传文件大小不能超过 1G</div> </el-upload> </div></template><script>import UploadFileApi from '@/api/system/UploadFileApi'import * as util from 'utils/common'import OSS from 'ali-oss'export default { name: 'fileUpload', props: { data_extra: {  type: Object,  required: true }, accept: {  type: Array,  required: true } }, data () { return {  uploadUrl: '',  uploadFileLength: 0,  uploadFileSuccess: 0,  uploadFileNames: [],  uploadFileName: [],  fileList: [],  files: 10,  uploadHeaders: {  authorization: ''  },  disabled: false } }, methods: { /**  * @description [fnUploadRequest 覆盖默认的上传行为,实现自定义上传]  * @author shanshuizinong  * @param {object} option [上传选项]  * @return {null} [没有返回]  */ async fnUploadRequest (option) {  try {  let vm = this  vm.disabled = true  // 获取OSS配置信息  let uploadFileApi = new UploadFileApi()  let ret = await uploadFileApi.fileOssParams()  if (!(ret.data && ret.data.code === '0' && ret.data.data)) {   throw new Error('获取OSS参数失败')  }  let ossData = JSON.parse(ret.data.data)  let relativePath = ossData.relativePath  let client = new OSS.Wrapper({   policy: ossData.policy,   accessKeyId: ossData.accessid,   accessKeySecret: ossData.accesssecret,   bucket: ossData.bucket,   signature: ossData.signature  })  let file = option.file  const point = file.name.lastIndexOf('.')  let suffix = file.name.substr(point)  let fileName = file.name.substr(0, point)  let date = vm.$moment().format('YYYYMMDDHHmm')  let fileNames = `${fileName}_${date}${suffix}`  // 分片上传文件  ret = await client.multipartUpload(relativePath + fileNames, file, {   progress: async function (p) {   let e = {}   e.percent = p * 100   option.onProgress(e)   }  })  console.log(ret)  if (ret.res.statusCode === 200) {   // option.onSuccess(ret)   return ret  } else {   vm.disabled = false   option.onError('上传失败')  }  } catch (error) {  console.error(error)  this.disabled = false  option.onError('上传失败')  this.$error(error.message)  } }, /**  * @description [fnUploadSuccess 文件上传成功的函数]  * @author shanshuizinong  * @return {null} [没有返回]  */ async fnUploadSuccess () {  // TODO } }}</script>

查看upload源码upload.vue知道httpRequest会有一个文件上传的option选项作为参数,upload/ajax源码中上传进度、上传成功、上传失败都是通过option调用其方法进行触发。

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