Python网络编程笔记一

AF_INET：IPV4

AF_INET6：IPV6

套接字类型：

SOCK_STREAM：TCP

SOCK_DGRAM：UDP

创建TCP套接字，也可以不传递参数，默认创建TCP套接字

tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

下面是基于python3实现的简单的TCP服务端和客户端

TCP使用send、recv发送和接收数据

服务端：

 import socket

 HOST = "127.0.0.1"
 PORT = 9999
 BUFFSIZE = 1024
 ADDR = (HOST, PORT)

 tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

 tcpSocket.bind(ADDR)

 tcpSocket.listen(5)

 while True:
     print("watting clien connection...")
     tcpClienSock, addr = tcpSocket.accept()
     print("connected from:", addr)
     while True:
         data = tcpClienSock.recv(BUFFSIZE)
         if not data:
             break
         print("i have received data: ", data)
         sendData = "hello, i have received your date: %s" % data
         tcpClienSock.send(bytes(sendData, encoding="utf-8"))
     tcpClienSock.close()
 tcpSocket.close()

客户端：

 import socket

 HOST = "127.0.0.1"
 PORT = 9999
 BUFFSIZE = 1024
 ADDR = (HOST, PORT)

 tcpClientSock = socket.socket()
 r = tcpClientSock.connect(ADDR)
 print(r)

 while True:
     data = input(">>")
     if data == "q" or data == "quit":
         break
     tcpClientSock.send(bytes(data, encoding="utf-8"))
     recvData = tcpClientSock.recv(BUFFSIZE)
     if not recvData:
         break
     print(recvData)
 tcpClientSock.close()

接下来是简单的UDP服务器和客户端实现

UDP使用sendto、recvfrom发送和接收数据

UDP服务器：

 import socket

 HOST = "127.0.0.1"
 PORT = 9999
 BUFFSIZE = 1024
 ADDR = (HOST, PORT)
 #UDP服务器创建套接字后，只需要绑定上IP和端口号，等待接收数据即可
 #不需要listen和accept
 udpSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 udpSocket.bind(ADDR)

 while True:
     print("watting message...")
     data, addr = udpSocket.recvfrom(BUFFSIZE) #会返回发送者地址
     sendData = "hello, i have recv your date: %s" % data
     udpSocket.sendto(bytes(sendData, encoding="utf-8"), addr)
     print("receive message %s from %s" % (data, addr))
 udpSocket.close()

UDP客户端：

 import socket

 HOST = "127.0.0.1" # 'localhost'也可以
 PORT = 9999
 BUFFSIZE = 1024
 ADDR = (HOST, PORT)
 #创建套接字即可发送数据，不需要connect连接
 udpClientSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

 while True:
     data = input(">>")
     if data == "q" or data == "quit":
         break
     udpClientSock.sendto(bytes(data, encoding="utf-8"), ADDR)
     recvData, addr = udpClientSock.recvfrom(BUFFSIZE)
     if not recvData:
         break
     print(recvData)
 udpClientSock.close()