此代码在linux上编写，适用于linux，windows下需要更改几个命令。
1、客户端输入IP，端口，可服务器端进行连接，被要求输入用户名和密码进行验证。
2、使用独立的模块来验证登录用户(技术有限，不支持客户端创建用户),用户名：ftpuser 密码：userlogin
2、客户端登录验证成功后，可使用？或者help查看可使用的命令。

ftpserver.py

复制代码 代码如下:

!/usr/bin/env python

-*- coding:utf-8

"Program for ftp server"

from SocketServer import
from time import
import os
import loginauth

class MyFtp(StreamRequestHandler):
def handle(self):
try:
while True:
sleep(0.5)
self.request.sendall('auth')
name = self.request.recv(BUFSIZ)
sleep(0.5)
self.request.sendall('pauth')
password = self.request.recv(BUFSIZ)
print name,password
auth_result = loginauth.user_create(name,password)
print auth_result
if auth_result == 0:
self.request.sendall('ok2login')
break
elif auth_result == 1:
self.request.sendall('fail2login')
continue

        while True:  
            recv_data = self.request.recv(BUFSIZ).split()  
            if recv_data[0] == 'rls':  
                result = os.popen('ls -l ./').read()  
                self.request.sendall(result)  
                continue  
            if recv_data[0] == '?' or recv_data[0] == 'help':  
                send_help = '''\033[32;1m  
                            ?\help:     Get help.  
                            Get:        Downlaod file from remote server.  
                            Send:       Send local file to remote server.  
                            ls:         List local file.  
                            rls:        List remote server file.  
                            quit\exit:  Quit the application.  
                            \033[0m'''  
                self.request.sendall(send_help)  
                continue  
            if recv_data[0] == 'send':  
                filename = recv_data[1]  
                self.request.sendall('ok2send')  
                recv_data = self.request.recv(BUFSIZ)  
                file2w = open(filename,'wb')  
                file2w.write(recv_data)  
                file2w.flush()  
                file2w.close()  
                self.request.sendall('\033[33;1mFile transfer successed!!!\033[0m')  
                continue

            if recv_data[0] == 'get':  
                filename = recv_data[1]  
                if os.path.isfile(filename):  
                    self.request.sendall('ok2get')  
                    if self.request.recv(BUFSIZ) == 'ok2send':  
                        self.request.sendall('sending')  
                        sleep(0.5)  
                        file_data = open(filename,'rb')  
                        file_tmp = file_data.read()  
                        self.request.sendall(file_tmp)  
                        sleep(1)  
                        self.request.sendall('\033[33;1mDownloading complete!\033[0m')  
                        file_data.close()

                else:  
                    self.request.sendall('fail2get')  
                    if self.request.recv(BUFSIZ) == 'ack':  
                        self.request.sendall('\033[31;1m%s not found\033[0m'% filename)  
    except :  
        pass

if name == 'main':
HOST,PORT = '',9889
ADDR = (HOST,PORT)
BUFSIZ = 8192

try:  
    server = ThreadingTCPServer(ADDR,MyFtp)  
    server.serve_forever()  
except KeyboardInterrupt:  
    server.shutdown()