vue-element-admin自带上传图片组件,在使用的过程中发现上传速度很慢,尤其是上传一些大图需要耗时几十秒不能忍受。出现这种情况,是因为upload组件会将图片上传到action="https://httpbin.org/post"
,并返回转换成base64编码格式的数据。
格式类似:
data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQEBAQIBAQECAgICAgQDAgICAgUEBAMEBgUGBgYFBgYGBwkIBgcJBwYGCAsIC.....
而且有可能这个base64编码比上传源文件还要大。
这样做有两个缺点:
- 多一步上传文件到第三方网站(https://httpbin.org/post),并转码base64,其中大部分时间在这一步浪费的。
- 服务端在接收base64编码内容,还要将其处理成文件进行单独保存(base64编码内容太长,通常不会直接存入数据库),这给服务端带来不便。
还有一点就这种是必须图片和表单其他内容一起提交,有的时候上传和表单其他项分开提交。
接下来讲一下如何将图片单独上传到服务的实现步骤:
具体代码在以下项目里
github:
https://github.com/guyan0319/go-admin
码云(国内):
https://gitee.com/jason0319/go-admin
示例一、解决如下图所示的上传和删除
1、新建文件
vue-element-admin\src\utils\global.js
内容如下
const httphost = 'http://localhost:8090' export { httphost }
这个是服务端的地址,可以根据需要自己调整。
2、修改上传组件代码在SingleImage3.vue
上传图片
引入上面定义的服务器地址
import { httphost } from '@/utils/global'
data()增加uploadUrl
data() { return { tempUrl: '', uploadUrl: httphost + '/upload/image', dataObj: { token: '', key: '' } } },
将
action=``"https://httpbin.org/post"
修改为
:action="uploadUrl"
图片上传成功on-success绑定的handleImageSuccess函数增加了res,即服务端返回上传结果。
修改代码如下
handleImageSuccess(res, file) { if (res.code !== 20000){ this.$message({ message: '上传失败', type: 'error', showClose: true }) return false } this.emitInput(res.data) },
服务端返回的json格式为
{ "code":20000, "data":"http://localhost:8090/showimage?imgname=upload/20200620/tX5vS810l2Fl0K02I0YJLEjLEw9OH7hc.jpg" }
这里需要注意el-upload增加
:with-credentials='true'
支持发送 cookie 凭证信息,上传文件到服务器端需要判断验证登录。
删除图片
通过以上修改实现上传图片,接下处理上传文件删除
文件api/article.js 增加
export function delImage(url) { return request({ url: '', method: 'get', params: { url }, baseURL: httphost + '/del/image' }) }
修改SingleImage3.vue
//引入delImage import { delImage } from '@/api/article'
rmImage() { delImage(this.value).then(response => { if (response.code === 20000){ this.emitInput('') return } this.$message({ message: '删除失败', type: 'error', showClose: true }) }).catch(err => { console.log(err) }) },
服务端删除文件返回json
{"code":20000,"data":"success"}
最后贴一下SingleImage3.vue修改后完整的代码
<template> <div class="upload-container"> <el-upload :data="dataObj" :multiple="false" :show-file-list="false" :with-credentials='true' :on-success="handleImageSuccess" class="image-uploader" drag :action="uploadUrl" > <i class="el-icon-upload" /> <div class="el-upload__text"> 将文件拖到此处,或<em>点击上传</em> </div> </el-upload> <div class="image-preview image-app-preview"> <div v-show="imageUrl.length>1" class="image-preview-wrapper"> <img :src="imageUrl"> <div class="image-preview-action"> <i class="el-icon-delete" @click="rmImage" /> </div> </div> </div> <div class="image-preview"> <div v-show="imageUrl.length>1" class="image-preview-wrapper"> <img :src="imageUrl"> <div class="image-preview-action"> <i class="el-icon-delete" @click="rmImage" /> </div> </div> </div> </div> </template> <script> import { getToken } from '@/api/qiniu' import { delImage } from '@/api/article' import { httphost } from '@/utils/global' // import { Cookies } from 'js-cookie' export default { name: 'SingleImageUpload3', props: { value: { type: String, default: '' } }, data() { return { tempUrl: '', uploadUrl: httphost + '/upload/image', dataObj: { token: '', key: '' } } }, computed: { imageUrl() { return this.value } }, methods: { rmImage() { delImage(this.value).then(response => { if (response.code === 20000){ this.emitInput('') return } this.$message({ message: '删除失败', type: 'error', showClose: true }) }).catch(err => { console.log(err) }) }, emitInput(val) { this.$emit('input', val) }, handleImageSuccess(res, file) { if (res.code !== 20000){ this.$message({ message: '上传失败', type: 'error', showClose: true }) return false } this.emitInput(res.data) }, beforeUpload() { const _self = this return new Promise((resolve, reject) => { getToken().then(response => { const key = response.data.qiniu_key const token = response.data.qiniu_token _self._data.dataObj.token = token _self._data.dataObj.key = key this.tempUrl = response.data.qiniu_url resolve(true) }).catch(err => { console.log(err) reject(false) }) }) } } } </script> <style lang="scss" scoped> @import "~@/styles/mixin.scss"; .upload-container { width: 100%; position: relative; @include clearfix; .image-uploader { width: 35%; float: left; } .image-preview { width: 200px; height: 200px; position: relative; border: 1px dashed #d9d9d9; float: left; margin-left: 50px; .image-preview-wrapper { position: relative; width: 100%; height: 100%; img { width: 100%; height: 100%; } } .image-preview-action { position: absolute; width: 100%; height: 100%; left: 0; top: 0; cursor: default; text-align: center; color: #fff; opacity: 0; font-size: 20px; background-color: rgba(0, 0, 0, .5); transition: opacity .3s; cursor: pointer; text-align: center; line-height: 200px; .el-icon-delete { font-size: 36px; } } &:hover { .image-preview-action { opacity: 1; } } } .image-app-preview { width: 320px; height: 180px; position: relative; border: 1px dashed #d9d9d9; float: left; margin-left: 50px; .app-fake-conver { height: 44px; position: absolute; width: 100%; // background: rgba(0, 0, 0, .1); text-align: center; line-height: 64px; color: #fff; } } } </style>
示例二、解决如下图所示的上传
需要修改vue-element-admin\src\components\Tinymce\components\EditorImage.vue文件,处理方式和示例一差不多,这里只贴代码
<template> <div class="upload-container"> <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true"> upload </el-button> <el-dialog :visible.sync="dialogVisible"> <el-upload :multiple="true" :file-list="fileList" :show-file-list="true" :with-credentials='true' :on-remove="handleRemove" :on-success="handleSuccess" :before-upload="beforeUpload" class="editor-slide-upload" :action="uploadUrl" list-type="picture-card" > <el-button size="small" type="primary"> Click upload </el-button> </el-upload> <el-button @click="dialogVisible = false"> Cancel </el-button> <el-button type="primary" @click="handleSubmit"> Confirm </el-button> </el-dialog> </div> </template> <script> // import { getToken } from 'api/qiniu' import { delImage } from '@/api/article' import { httphost } from '@/utils/global' export default { name: 'EditorSlideUpload', props: { color: { type: String, default: '#1890ff' } }, data() { return { dialogVisible: false, uploadUrl: httphost + '/upload/image', listObj: {}, fileList: [] } }, methods: { checkAllSuccess() { return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess) }, handleSubmit() { const arr = Object.keys(this.listObj).map(v => this.listObj[v]) if (!this.checkAllSuccess()) { this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!') return } this.$emit('successCBK', arr) this.listObj = {} this.fileList = [] this.dialogVisible = false }, handleSuccess(response, file) { const uid = file.uid const objKeyArr = Object.keys(this.listObj) for (let i = 0, len = objKeyArr.length; i < len; i++) { if (this.listObj[objKeyArr[i]].uid === uid) { this.listObj[objKeyArr[i]].url = response.data // this.listObj[objKeyArr[i]].url = response.files.file this.listObj[objKeyArr[i]].hasSuccess = true return } } }, handleRemove(file) { const uid = file.uid const objKeyArr = Object.keys(this.listObj) for (let i = 0, len = objKeyArr.length; i < len; i++) { if (this.listObj[objKeyArr[i]].uid === uid) { delImage(this.listObj[objKeyArr[i]].url).then(response => { if (response.code !== 20000) { this.$message('删除失败') return } delete this.listObj[objKeyArr[i]] }).catch(err => { console.log(err) }) return } } }, beforeUpload(file) { const _self = this const _URL = window.URL || window.webkitURL const fileName = file.uid this.listObj[fileName] = {} return new Promise((resolve, reject) => { const img = new Image() img.src = _URL.createObjectURL(file) img.onload = function() { _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height } } resolve(true) }) } } } </script> <style lang="scss" scoped> .editor-slide-upload { margin-bottom: 20px; /deep/ .el-upload--picture-card { width: 100%; } } </style>标签:vue,return,admin,data,image,element,listObj,const,上传 From: https://www.cnblogs.com/minch/p/17484854.html