flask框架研究：
https://blog.csdn.net/shifengboy/article/details/114274271
https://blog.csdn.net/weixin_67531112/article/details/128256170
实现下载文件功能
vim test.pyimport iofrom flask import Flask, send_fileapp = Flask(__name__)@app.route('/download', methods=['GET'])def download_file():# 当前目录下创建文件对象filename = "file.txt"file = open(filename, "w")# 写入数据到文件file.write("Hello, World!")# 关闭文件file.close()try:# 尝试打开文件并发送return send_file(filename, as_attachment=True)except PermissionError:return {"code": 403, "message":"文件权限错误，无法访问", "data":""}except Exception as e:return {"code": 500, "message":"发生错误", "data": str(e)}if __name__ == '__main__':#app.run()svhost="0.0.0.0"svport=9001app.run(debug=True, host=svhost, port=svport)1.filename 变量中提供要下载的文件的路径。
2.当访问 download 路由时，会触发download_file 函数，该函数使用send_file 方法将文件发送到客户端以进行下载
3.as_attachment=True 表示将文件作为附件下载，而不是在浏览器中直接打开。
(base) user@ubuntu:~$ python test.py * Serving Flask app 'flash_send' * Debug mode: onWARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Running on all addresses (0.0.0.0) * Running on http://127.0.0.1:9001 * Running on http://192.168.98.169:9001Press CTRL+C to quit * Restarting with watchdog (inotify) * Debugger is active! * Debugger PIN: 188-315-851浏览器中输入 http://192.168.98.169:9001/download
