vue element中axios下载文件(后端Python)

•axios 接受文件流,需要设置 {responseType:'arraybuffer'}

axios.post(
  apiUrl,
  formdata, 
  {responseType:'arraybuffer'}
).then(res=> {
  if (res.status === 200) {
   let blob = new Blob([res.data], {
    type: res.headers['content-type']
    });

    const fileName = res.headers['content-disposition'];
   const title = fileName && (fileName.indexOf('filename=') !== -1) ? fileName.split('=')[1] : 'download';

    require('script-loader!file-saver');
   saveAs(blob, title);
} 
})
.catch();

注: axios 中 response 表示服务器响应的数据类型,可以是 arraybuffer , blob, document , json , text , stream . 默认为: json

•后端发送文件:Python

from flask import send_from_directory
@admin_bp.route('/tasksothers/download', methods=["GET", "POST"])
@auth.login_required
def api_tasksothers_download():
    root_path = ''
    src_name = "a.sql"
    upload_path = os.path.join(root_path, src_name)
    print("upload_path =", upload_path)
    if os.path.isfile(upload_path):
      response = send_from_directory(root_path, src_name, as_attachment=True)
      print("response: ",response)

      response.headers["Access-Control-Expose-Headers"] = "Content-disposition"
      print("response: ", response.headers)
      return response

注: 如果 response.header 中没有添加  Access-Control-Expose-Headers 这个参数(代表:服务器允许浏览器访问的头(headers)的白名单),vue中就无法获取 content-disposition,即 res.headers['content-disposition'];无法找到

总结

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