vue-element-admin 上传upload图片慢问题处理
前言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
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前言
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>
至此，vue-element-admin 单独上传图片实现方式就讲完了，如有任何问题或建议欢迎提issues，
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