服務器：#server.py

#!/usr/bin/env python#-*-coding:utf-8-*-import sysimport struct#將字符串打包為二進制流進行網絡傳輸import select#import signal#用于捕獲中斷信號import cPickle#將python對象進行序列化:dumps將python對象序列化保存為字符串,loads與之相反from socket import *HOST = ''def send(channel,*args):#發送數據  buffer = cPickle.dumps(args)  value = htonl(len(buffer))  size = struct.pack("L",value)  channel.send(size)  channel.send(buffer)def receive(channel):#接收數據  size = struct.calcsize("L")  size = channel.recv(size)  try:    size = ntohl(struct.unpack("L",size)[0])#socket.ntohl(參考：http://blog.csdn.net/tatun/article/details/7194973)  except struct.error,e:    return ''  buf = ''  while len(buf) < size:    buf += channel.recv(size-len(buf))  return cPickle.loads(buf)[0]#恢復python對象 class ChatServer(object):  def __init__(self,PORT,backlog = 5):    self.clients = 0    self.clientmap = {}    self.outputs = [] #Client會話列表    self.server = socket(AF_INET, SOCK_STREAM)    self.server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)#重用套接字地址    self.server.bind((HOST,PORT))    self.server.listen(backlog)    signal.signal(signal.SIGINT,self.signalhandler)#使用signal模塊捕獲中斷操作 SIGINT中斷進程(ctrl+c)， SIGTERM 終止進程，SIGKILL殺死進程，SIGALRM 鬧鐘信號   def signalhandler(self,signum,frame):#中斷處理方法    print "Shutting down server ..."    for output in self.outputs:      output.close()    self.server.close()   def get_client_name(self,client):    info = self.clientmap[client]    host,port,name = info[0][0],info[0][1],info[1]    return ':'.join((('@'.join((name,host))),str(port)))   def run(self):    inputs = [self.server]    print 'Waiting for connect...'    while True:      try:        readable,writeable,execption = select.select(inputs,self.outputs,[])      except select.error,e:        break      for sock in readable:        if sock == self.server:#服務器端接收          client,address = self.server.accept()          print "Chat server: connected from",address          self.clients += 1          cname = receive(client)          send(client,str(address[0]))          inputs.append(client)          self.clientmap[client] = (address,cname)          msg = "(Connected : New Client(%d) from %s)/n"%(self.clients,self.get_client_name(client))          message = "At present, only one of you is in the chat room!"          if self.clients == 1:            send(client,message)          for output in self.outputs:            send(output,msg)          self.outputs.append(client)#將開始回話的client加入Client回話列表         #elif sock == sys.stdin:          #break        else:          try:            data = receive(sock)            if data:              msg = '[' + self.get_client_name(sock)+ '] >> ' + data              for output in self.outputs:                if output!=sock:                  send(output,msg)            else:              self.clients-=1              sock.close()              inputs.remove(sock)              self.outputs.remove(sock)              msg = '(Now hung up: Client from %s)'%self.get_client_name(sock)              message = "At present, only one of you is in the chat room!"              for output in self.outputs:                send(output,msg)              if self.clients == 1:                send(self.outputs[0],message)          except error,e:            inputs.remove(sock)            self.outputs.remove(sock)    self.server.close()if __name__ == "__main__":    server = ChatServer(6004)    server.run()