python socket实现简单的(TCP/UDP)服务器/客户端

1、创建TCP服务端

# -*- coding: utf-8 -*-   
from socket import *  
from time import ctime  

HOST = 'localhost'          #主机名  
PORT =  9999               #端口号  
BUFSIZE = 1024              #缓冲区大小1K  
ADDR = (HOST,PORT)  

tcpSerSock = socket(AF_INET, SOCK_STREAM)  
tcpSerSock.bind(ADDR)       #绑定地址到套接字  
tcpSerSock.listen(5)        #监听 最多同时5个连接进来  

while True:                 #无限循环等待连接到来  
    try:  
        print 'Waiting for connection ....'  
        tcpCliSock, addr = tcpSerSock.accept()  #被动接受客户端连接  
        print u'Connected client from : ', addr  

        while True:  
            data = tcpCliSock.recv(BUFSIZE)     #接受数据  
            if not data:  
                break  
            else:  
                print 'Client: ',data  
            tcpCliSock.send('[%s] %s' %(ctime(),data)) #时间戳  

    except Exception,e:  
        print 'Error: ',e  
tcpSerSock.close()          #关闭服务器  

2、创建TCP客户端

# -*- coding: utf-8 -*-   
from socket import *  

HOST = 'localhost'          #主机名  
PORT =  9999               #端口号 与服务器一致  
BUFSIZE = 1024              #缓冲区大小1K  
ADDR = (HOST,PORT)  

tcpCliSock = socket(AF_INET, SOCK_STREAM)  
tcpCliSock.connect(ADDR)    #连接服务器  

while True:                 #无限循环等待连接到来  
    try:  
        data = raw_input('>')  
        if not data:  
            break  
        tcpCliSock.send(data)            #发送数据  
        data = tcpCliSock.recv(BUFSIZE)  #接受数据  
        if not data:  
            break  
        print 'Server: ', data  
    except Exception,e:  
        print 'Error: ',e  

tcpCliSock.close()          #关闭客户端  

至此TCP的服务端和客户端已创建完毕！！

3、创建UDP服务器

    # -*- coding: utf-8 -*-   
    from socket import *  
    from time import ctime  

    HOST = '127.0.0.1'                   #主机名  
    PORT =  9999              #端口号  
    BUFSIZE = 1024              #缓冲区大小1K  
    ADDR = (HOST,PORT)  

    udpSerSock = socket(AF_INET, SOCK_DGRAM)  
    udpSerSock.bind(ADDR)       #绑定地址到套接字  

    while True:                 #无限循环等待连接到来  
        try:  
            print 'Waiting for message ....'  
            data, addr = udpSerSock.recvfrom(BUFSIZE)          #接受UDP  
            print 'Get client msg is: ', data  
            udpSerSock.sendto('[%s] %s' %(ctime(),data), addr) #发送UDP  
            print 'Received from and returned to: ',addr  

        except Exception,e:  
            print 'Error: ',e  
    udpSerSock.close()          #关闭服务器  

4、创建UDP客户端

    # -*- coding: utf-8 -*-   
    from socket import *  

    HOST = '127.0.0.1'          #主机名  
    PORT =  9999               #端口号 与服务器一致  
    BUFSIZE = 1024              #缓冲区大小1K  
    ADDR = (HOST,PORT)  

    udpCliSock = socket(AF_INET, SOCK_DGRAM)  

    while True:                 #无限循环等待连接到来  
        try:  
            data = raw_input('>')  
            if not data:  
                break  
            udpCliSock.sendto(data, ADDR)            #发送数据  
            data,ADDR = udpCliSock.recvfrom(BUFSIZE)  #接受数据  
            if not data:  
                break  
            print 'Server : ', data  

        except Exception,e:  
            print 'Error: ',e  

    udpCliSock.close()          #关闭客户端  

推荐参考地址： 网络编程之套接字Socket、TCP和UDP通信实例