Vue resource与axios上传文件blob的配置

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我是靠谱客的博主稳重小馒头，最近开发中收集的这篇文章主要介绍Vue resource与axios上传文件blob的配置，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

问题：后台返回一个stream流，前台无法用blob准确接收，new Blob的字节数和后台返回不一致。
后台返回：

示意代码：
public void downloadTemplate(HttpServletResponse response) {
String newFileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8.name());
response.reset();
response.setCharacterEncoding("UTF-8");
response.setHeader("Access-Control-Allow-Origin", "*");
response.setContentType("application/octet-stream;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=" + newFileName);
response.setHeader("Custom-Header", newFileName);
response.setHeader(HttpHeaders.ACCEPT_ENCODING, "UTF-8");
response.setHeader("Access-Control-Expose-Headers", "Custom-Header");
HttpEntity responseEntity = docService.download();//业务代码获取文件
OutputStream os = response.getOutputStream();
responseEntity.writeTo(os);
os.flush();
os.close();
}

前端axios代码：是正常可以返回blob数据，并接收

axios.get(api, { responseType: 'blob'}).then((response) => {
let blob = new Blob([response.data])
let url = window.URL.createObjectURL(blob);
let link = document.createElement('a');
link.href = url;
link.setAttribute('download', decodeURIComponent(response.headers['custom-header']));
// 给a标签加一个download属性
link.click();
//模拟点击
window.URL.revokeObjectURL(link.href);
});

前端vue-resource代码：是正常可以返回blob数据，但是接收的数据大小不对

vm.$http.get(url).then(response => {
const element = document.createElement("a");
let blob = new Blob([response.data], {'type': 'application/octet-stream;charset=UTF-8'})
element.href = URL.createObjectURL(blob);
element.download = decodeURIComponent(response.headers.get("Custom-Header"));
element.click();
})
改正：vm.$http.get(url,{ responseType: 'blob'}),
一定别忘记设计responseType，返回数据类型为Blob，否则vue-resource默认返回json数据。