windows系统基于python搭建简单的FTP服务器（可以跨越云桌面开发无法往外传输文件的问题）

# -*- coding:utf-8 -*-
import os
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
 
 
def main():
    # Instantiate a dummy authorizer for managing 'virtual' users
    authorizer = DummyAuthorizer()
 
    # Define a new user having full r/w permissions and a read-only
    # anonymous user
    authorizer.add_user('user', '12345', '.', perm='elradfmwM')
    # authorizer.add_anonymous(os.getcwd())
 
    # Instantiate FTP handler class
    handler = FTPHandler
    handler.authorizer = authorizer
 
    # Define a customized banner (string returned when client connects)
    handler.banner = "pyftpdlib based ftpd ready."
 
    # Specify a masquerade address and the range of ports to use for
    # passive connections.  Decomment in case you're behind a NAT.
    #handler.masquerade_address = '151.25.42.11'
    #handler.passive_ports = range(60000, 65535)
 
    # Instantiate FTP server class and listen on 0.0.0.0:2121
    address = ('100.4.251.97', 2121)
    server = FTPServer(address, handler)
 
    # set a limit for connections
    server.max_cons = 256
    server.max_cons_per_ip = 5
 
    # start ftp server
    server.serve_forever()
 
if __name__ == '__main__':
    main()