flask_restful实现文件下载功能

环境：前后端完全分离，后端flask_restful，前端vue

from flask_restful import reqparse, Resource
from flask import send_from_directory,send_file,safe_join
from werkzeug.utils import secure_filename

class DownloadTemplates(Resource):
    def get(self):
        parser = reqparse.RequestParser(trim=True)
        parser.add_argument('filename', required=True, nullable=False, location=['args'])
        args = parser.parse_args()
        filename = args['filename']
        path = handle_manage.template_dir
        response = send_from_directory(path, filename, as_attachment=True)
        return response


注意：这种做法有时会报错404，提示找不到url
genericpath.py 如果系统安装了这个组件的话：
 
会替换系统自带的path功能，导致，path失效了。最终会找不到文件。
 
代码只有这样简短的几句话而已。就是这个os.path.isfile会有问题。所以，放在uploaded_file中来完成这个动作，就可以了

class DownloadTemplates(Resource):
    def get(self):
        parser = reqparse.RequestParser(trim=True)
        parser.add_argument('filename', required=True, nullable=False, location=['args'])
        args = parser.parse_args()
        UPLOAD_FOLDERS = handle_manage.template_dir
        filename = args['filename']
        return send_file(safe_join(UPLOAD_FOLDERS, secure_filename(filename)), as_attachment=True)

 

 

前端

this.currentNode.path 为文件绝对路径

//方法一
//response.data + '/' + download_url 是绝对地址

window.open(response.data + '/' + download_url, '_blank');

//方法二
let a = document.createElement('a')
a.href = response.data + '/' + download_url
a.click();