Python实现的使用telnet登陆聊天室实例

本文实例讲述了Python实现的使用telnet登陆聊天室。分享给大家供大家参考。具体如下：

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\r\n %s\r\n'%(now, client.clientname, string)
        self.sendtoall(sendstring, client)
    else:
      if self.clientnames.__contains__(string):
        client.sendstring('%s is exited!!!\r\n'%string)
      else:
        client.clientname = string
        client.sendstring('Hell, %s!!!\r\n'%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):\r\n'%len(self.clients))
      for i in self.clients:
        clt = self.clients[i]
        client.sendstring(' %d\t%s\r\n'%(clt.clientid, clt.clientname))
    else:
      client.sendstring('Unknow command: %s:\r\n'%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!!!\r\n'%client.clientname, client)
    self.clients[client.clientid] = client
    self.clientnames[client.clientname] = client.clientid
  def delclient(self, client):
    self.sendtoall('%s logouted!!!\r\n'%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。