Vue Element UI + OSS实现上传文件功能

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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