python实现类似ftp传输文件的网络程序示例

　　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
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()

　　loginauth.py
复制代码 代码如下:
#!/usr/bin/env python
#-*- coding:utf-8
#Filename:userlogin.py

　　Program for userlogin

　　import sys,time
import cPickle as pickle

　　#If its your first running this program,use USERDB = {}
#If it is not your first running this program,use USERDB = pickle.load(open(userdb,rb))
USERDB = pickle.load(open(userdb,rb))
#USERDB = {}

　　class userdb(object):
def __init__(self,username,password,time):
self.passwd = password
self.time = time

　　 def save_user(self):
USERDB[self.username] = [self.passwd,self.time]
pickle.dump(USERDB,open(userdb,wb),True)

　　 def update_db(self):
pass

　　def user_create(NAME,PASSWD = ):
if NAME in USERDB:
if PASSWD == USERDB[NAME][0]:
p = userdb(NAME,PASSWD,time.time())
p.save_user()
return 0
else:
return 1

　　 else:
#p = userdb(NAME,PASSWD,time.time())
#p.save_user()
return 1

　　if __name__ == __main__:
user_create(name,password)

　　ftpclient.py
复制代码 代码如下:
#!/usr/bin/env python
#-*- coding:utf-8

　　
Program for ftp client.

　　from socket import *
from time import sleep
import os

　　
def auth():
while 1:
try:
recv_msg = s.recv(BUFSIZ)
if recv_msg == auth:
USER = str(raw_input(Please input your username: )).strip()
s.sendall(USER)
if s.recv(BUFSIZ) == pauth:
PASS = str(raw_input(Please input your password: )).strip()
s.sendall(PASS)
recv_msg1 = s.recv(BUFSIZ)
if recv_msg1 == ok2login:
print \033[33;1mlogin success!!!\033[0m
break
elif recv_msg1 == fail2login:
print \033[33;1mlogin failure!!!\033[0m
continue
else:
continue
except:
return error

　　def switch():
while True:
INPUT = str(raw_input(ftp> )).strip()
if len(INPUT) == 0:continue
elif INPUT == quit or INPUT == exit:
s.close()
break
elif INPUT == ? or INPUT == help:
s.send(INPUT)
recv_data = s.recv(BUFSIZ)
print recv_data
continue
elif INPUT == get or INPUT == send:
print \033[31;1mYou must specified filename!!\033[0m
continue
elif INPUT == ls:
cmd = os.popen(ls -l ./).read()
print cmd
continue
elif INPUT == rls:
s.send(INPUT)
recv_data = s.recv(BUFSIZ)
print recv_data
continue

　　 elif INPUT.split()[0] == send:
filename = INPUT.split()[1]
if os.path.isfile(filename):
print Sending %s......% filename
s.sendall(INPUT)
re_data = s.recv(BUFSIZ)
if re_data == ok2send:
file_data = open(filename,rb)
file_tmp = file_data.read()
file_data.close()
s.sendall(file_tmp)
sleep(0.5)
recv_data = s.recv(BUFSIZ)
print recv_data
continue
else:continue
else:
print \033[31;1m%s not found!\033[0m% filename

　　 elif INPUT.split()[0] == get:
filename = INPUT.split()[1]
s.sendall(INPUT)
msg1 = s.recv(BUFSIZ)
if msg1 == ok2get:
s.sendall(ok2send)
msg2 = s.recv(BUFSIZ)
if msg2 == sending:
file_data = s.recv(BUFSIZ)
file2w = open(filename,wb)
file2w.write(file_data)
file2w.flush()
file2w.close()
msg3 = s.recv(BUFSIZ)
print msg3
continue
elif msg1 == fail2get:
s.send(ack)
msg4 = s.recv(BUFSIZ)
print msg4
continue
else:
continue

　　
if __name__ == __main__:
#Default 127.0.0.1
HOST = str(raw_input(Server IP: )).strip()
#Defautl 9889
PORT = int(raw_input(Server PORT: ))
ADDR = (HOST,PORT)
BUFSIZ = 8192

　　 s = socket(AF_INET,SOCK_STREAM)
try:
except :
pass

　　 if auth() == error:
print Connection refused.
else:
switch()