最近二进制文件流下载可谓是又出幺蛾子，翻阅以前的文章也找不到解决方案，感觉还是没用完全理解，这次再整理一遍。
先说一个通用场景，就是无论get还是post在接口请求的时候设定好
headers: { 'Content-Type': 'application/json;charset=UTF-8' },
responseType: "blob"
比如你有一个axios实例名为service，那么他的post和get分别为：
// 下载模板
export const exportExcle = (params) => service.post('detail/export', params, {headers: { 'Content-Type': 'application/json;charset=UTF-8' },responseType: "blob"
});// 下载模板
export const getTemplateDownload = (params) => service.get('template/download', { params,headers: { 'Content-Type': 'application/json;charset=UTF-8' },responseType: "blob"
});
通过上述接口请求，可以直接获取文件流，如下：
这时候可以用console 打印一下，确认当前的文件流信息是 response，还是 response.data。
将确认好的文件流，转为blob地址（以excel为例）
const blob = new Blob([response], {type: 'application/vnd.ms-excel',});
或
const blob = new Blob([response.data], {type: 'application/vnd.ms-excel',});
最后通过模拟一个a标签，进行下载
const blobUrl = window.URL.createObjectURL(blob);
const link = document.createElement('a');
link.style.display = 'none';
link.href = blobUrl;
link.download = `${fileName}.xlsx`;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
完整方案：
export const exportExcle = (params) => service.post('detail/export', params, {headers: { 'Content-Type': 'application/json;charset=UTF-8' },responseType: "blob"
});export const downloadFile = (response, fileName = 'exported_file') => {const blob = new Blob([response], {type: 'application/vnd.ms-excel',});const blobUrl = window.URL.createObjectURL(blob);const link = document.createElement('a');link.style.display = 'none';link.href = blobUrl;link.download = `${fileName}.xlsx`;document.body.appendChild(link);link.click();document.body.removeChild(link);
}exportExcle.then(res => {downloadFile(res, 'template')
})
如果有其他形式文件，blob的格式如下：
const blob = new Blob(['后台返回的二进制文件'],{type : '该文件是什么类型的文件(MIME)'});后缀名 MIME名称
*.3gpp audio/3gpp, video/3gpp
*.ac3 audio/ac3
*.asf allpication/vnd.ms-asf
*.au audio/basic
*.css text/css
*.csv text/csv
*.doc application/msword
*.dot application/msword
*.dtd application/xml-dtd
*.dwg image/vnd.dwg
*.dxf image/vnd.dxf
*.gif image/gif
*.htm text/html
*.html text/html
*.jp2 image/jp2
*.jpe image/jpeg
*.jpeg image/jpeg
*.jpg image/jpeg
*.js text/javascript, application/javascript
*.json application/json
*.mp2 audio/mpeg, video/mpeg
*.mp3 audio/mpeg
*.mp4 audio/mp4, video/mp4
*.mpeg video/mpeg
*.mpg video/mpeg
*.mpp application/vnd.ms-project
*.ogg application/ogg, audio/ogg
*.pdf application/pdf
*.png image/png
*.pot application/vnd.ms-powerpoint
*.pps application/vnd.ms-powerpoint
*.ppt application/vnd.ms-powerpoint
*.rtf application/rtf, text/rtf
*.svf image/vnd.svf
*.tif image/tiff
*.tiff image/tiff
*.txt text/plain
*.wdb application/vnd.ms-works
*.wps application/vnd.ms-works
*.xhtml application/xhtml+xml
*.xlc application/vnd.ms-excel
*.xlm application/vnd.ms-excel
*.xls application/vnd.ms-excel
*.xlt application/vnd.ms-excel
*.xlw application/vnd.ms-excel
*.xml text/xml, application/xml
*.zip aplication/zip *.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
至此完结撒花。以后下载类需求再也不会堵我时间了。
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