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()