Axios 的特殊应用：上传获取进度及下载文件

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上传

获取上传文件内容

import { ref } from 'vue'
import axios from 'axios'

const fileRef = ref(null)
const progress = ref(0);


const handleUpload = () => {
  let tempFile = fileRef.value.files[0]
  if (tempFile.size > 10 * 1024 * 1024) {
    // 文件大小超限了
    alert('请上传小于10M的图片');
    fileRef.value.value = '' // 清空内容
    return
  }
  
  let file = new FormData()
  file.append('file', tempFile)

设置进度条

<template>
<div class="process">
    <div class="process-bar":style="{width:progress+'%}"/>
</div>
</template>

<style lang="scss">
.process{
     height: 7px;
     color:#ccc;
     margin: 10px 70px 0;
     border-radius: 100px;
     background-color: #CCC;
     position: relative;
    .process-bar{
       height: 7px;
       background-color: #1890ff;
       border-radius: 100px;
       position: absolute;
       left: 0;
    }
}
</style>

文件上传方法

axios({
    method: 'post',
    url,
    data: file,
    headers: { 'Content-Type': 'multipart/form-data' },
    onUploadProgress: function(progressEvent) {
      const complete = parseInt((progressEvent.loaded / progressEvent.total * 100 | 0))
      // 上传的进度
      progress.value = complete
    }
  }).then(res => {
    // 上传成功后续处理
    const { data } = res
    if (data.success) {
        console.log('上传成功')
    }
  }).catch(err => {
    // 捕获异常并处理
    console.log(err)
  })

完整代码

Vue 3 下上传文件并获取时时进度

<script setup>
import { ref } from 'vue'
import axios from 'axios'

const fileRef = ref(null)
const progress = ref(0);

// 上传方法
const handleUpload = () => {
  let tempFile = fileRef.value.files[0]
  if (tempFile.size > 10 * 1024 * 1024) {
    // 文件大小超限了
    alert('请上传小于10M的图片');
    fileRef.value.value = '' // 清空内容
    return
  }
  
  let file = new FormData()
  file.append('file', tempFile)
 
  fileRef.value.value = '' // 清空内容

    axios({
        method: 'post',
        url,
        data: file,
        headers: { 'Content-Type': 'multipart/form-data' },
        onUploadProgress: function(progressEvent) {
          const complete = parseInt((progressEvent.loaded / progressEvent.total * 100 | 0))
          // 上传的进度
          progress.value = complete
        }
      }).then(res => {
        // 上传成功后续处理
        const { data } = res
        if (data.success) {
            console.log('上传成功')
        }
      }).catch(err => {
        // 捕获异常并处理
        console.log(err)
      })

      upload(forms).then((res: any) => {
        console.log(res)
      }).catch((err:any)=>{
        console.log(err)
      });
    }
</script>

<template>
<div class="process">
    <div class="process-bar":style="{width:progress+'%}"/>
</div>
<input
    type="file"
    accept="video/*"
    ref="fileRef"
    @change="handleUpload"
/>
</template>

<style lang="scss">
.process{
     height: 7px;
     color:#ccc;
     margin: 10px 70px 0;
     border-radius: 100px;
     background-color: #CCC;
     position: relative;
    .process-bar{
       height: 7px;
       background-color: #1890ff;
       border-radius: 100px;
       position: absolute;
       left: 0;
    }
}
</style>

下载

<div @click="downLoad()">下载</div>

<script setup>
    const downLoad = () => {
        var params={
            name: xxx //额外需要携带的参数
        }
        Axios.get('/api/export',{
            params: params,
            responseType: 'blob'   //设置responseType字段格式为 blob
        }).then(res => {
            console.log(res);
            // 为blob设置文件类型，这里以.xlsx为例
            let blob = new Blob([res], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;"}); 
            // 创建一个临时的url指向blob对象
            let url = window.URL.createObjectURL(blob);
            let a = document.createElement("a");
            a.href = url;
            a.download = '自定义文件名';
            a.click();
            // 释放这个临时的对象url
            window.URL.revokeObjectURL(url); 
        });
    }
</script>

还可以借助 js-file-download 插件完成下载功能

<script setup>
    import axios from 'axios'
    import fileDownload from 'js-file-download';

    const download =()=> {
      axios.get('下载地址', {
        responseType: 'blob',
      }).then(res => {
        fileDownload(res.data, '下载的文件名字');
      });
    }
  </script>