Python实现的使用telnet登陆聊天室实例

前久在家学习Python的时候写的一个简单的聊天室，可以使用telnet来登陆。

遗憾的是现在对中文的支持很差，英文聊天倒是没什么问题了。

功能很简单的，应该没有你想象的那么强大，但是你如果有兴趣的话可以试试的。

另外，让我惊奇的是它可以在Android的平板上运行SL4A的Python解释器上运行（需要稍微改几句代码，貌似是编码的那个地方，我记不清了）。

现在这个是可以在PC上跑起来的。

废话不多，直接放代码了，就一个py文件而已，而且注释是乱七八糟的，编码风格也不好（好神似我在用类C语言的习惯）。

# Filename: ChatRoomServer.py 
import threading 
import datetime 
import socket 
# a simple log function 
def log(lg): 
 print(lg) 
# Chat room server listen thread class, this class is use for listening client login 
# when a client request to connect server, this class will start a connect thread 
class ServerListenThread(threading.Thread): 
 def __init__(self, hostname, port, accept): 
 threading.Thread.__init__(self) 
 self.hostname = hostname 
 self.port = port 
 self.accept = accept 
 self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
 self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 
 self.sock.bind((hostname, port)) 
 self.sock.listen(0) 
 log('ServerIp:%s ServerPort:%s waiting for client...'%self.sock.getsockname()) 
 def run(self): 
 clientid = 1 
 while True: 
 client, cltadd = self.sock.accept() 
 log('a request from Id=%s%s'%('%d Address:'%clientid , cltadd)) 
 if self.accept(clientid, client): 
 clientid = clientid + 1 
# Connect thread class, this class is use for connecting with client and receiving client's message 
class ServerConnectThread(threading.Thread): 
 def __init__(self, clientid, client, encoding, receive, disconnect):
 threading.Thread.__init__(self) 
 self.client = client 
 self.clientid = clientid 
 self.encoding = encoding 
 self.receive = receive 
 self.disconnect = disconnect 
 self.clientname = None 
 self.inputs = self.client.makefile('rb', 0) 
 self.outputs = self.client.makefile('wb', 0) 
 def run(self): 
 self.sendstring('Input your name:') 
 while True: 
 string = self.readline() 
 if string: 
 string = string.lstrip() 
 if len(string)>0: 
 self.receive(self, string) 
 else: 
 self.inputs.close() 
 self.outputs.close() 
 break 
 if self.clientname: 
 self.disconnect(self) 
 def sendstring(self, string): 
 self.sendbytes(bytes(string, self.encoding)) 
 def sendbytes(self, bts): 
 self.outputs.write(bts) 
 def readline(self): 
 rec = self.inputs.readline() 
 if rec: 
 string = bytes.decode(rec, self.encoding) 
 if len(string)>2: 
 string = string[0:-2] 
 else: 
 string = ' ' 
 else: 
 string = False 
 return string 
# Chat room server class, this class is constitute of a listen thread and many connect thread 
class ChatRoomServer: 
 def __init__(self, ip='0.0.0.0', port=9113, encoding='utf-8'): 
 self.hostname = ip 
 self.encoding = encoding 
 self.port = port 
 self.clients = {} 
 self.clientnames = {} 
 def whenconnect(self, clientid, client): 
 log('a connect with Id=%s%s'%('%d Address:'%clientid , client.getpeername())) 
 connect = ServerConnectThread(clientid, client, self.encoding, self.whenreceive, self.whenexit) 
 connect.start() 
 return True 
 def whenreceive(self, client, string): 
 log('frome %d, receive:%s (%d)'%(client.clientid, string, len(string))) 
 if client.clientname: 
 if string[0]=='.': 
 self.handlecmd(client, string[1:]) 
 else: 
 now = datetime.datetime.now() 
 sendstring = '%s %s
 %s
'%(now, client.clientname, string) 
 self.sendtoall(sendstring, client) 
 else: 
 if self.clientnames.__contains__(string): 
 client.sendstring('%s is exited!!!
'%string) 
 else: 
 client.clientname = string 
 client.sendstring('Hell, %s!!!
'%client.clientname) 
 self.addclient(client) 
 return True 
 def whenexit(self, client): 
 self.delclient(client) 
 return True 
 def handlecmd(self, client, cmd): 
 log('cmd: %s'%cmd) 
 if cmd=='user': 
 client.sendstring('User list(%d):
'%len(self.clients)) 
 for i in self.clients: 
 clt = self.clients[i] 
 client.sendstring(' %d	%s
'%(clt.clientid, clt.clientname)) 
 else: 
 client.sendstring('Unknow command: %s:
'%cmd) 
 def start(self): 
 serverlisten = ServerListenThread(self.hostname, self.port, self.whenconnect) 
 serverlisten.start() 
 def sendtoall(self, string, notfor): 
 sends = bytes(string, self.encoding) 
 for i in self.clients: 
 if not(notfor and notfor.clientid==i): 
 self.clients[i].sendbytes(sends) 
 def addclient(self, client): 
 self.sendtoall('%s logined!!!
'%client.clientname, client) 
 self.clients[client.clientid] = client 
 self.clientnames[client.clientname] = client.clientid 
 def delclient(self, client): 
 self.sendtoall('%s logouted!!!
'%client.clientname, client) 
 del self.clients[client.clientid] 
 del self.clientnames[client.clientname] 
# start a chat room server 
ChatRoomServer().start()

有了这个服务器程序之后就可以了（当然前提是你安装的Python解释器），没有客户端的，那么你会问怎么开始聊天呢？

下面开始介绍怎么开始聊天，首先你把这个文件运行起来，如下图可以看到服务器正在等待客户端登陆了：

客户端直接使用telnet命令登陆，注意端口应该和服务器的一样，命令为：telnet 127.0.0.1 9011，自动打开telnet控制台，输入自己的名字吧：

现在你在看看服务器端的控制台界面，可以看到记录了登陆消息：

继续使用telnet登陆另外的用户之后就可以聊天了：

功能很简陋了，不过这让我想起了二三十年前的事，嘿嘿，那时候应该就是这样子聊天的了吧，生在这个时代的我们永远都体会不到那种乐趣了。

希望本文所述对大家的Python程序设计有所帮助。