Python網路編程筆記一

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AF_INET：IPV4

AF_INET6：IPV6

通訊端類型：

SOCK_STREAM：TCP

SOCK_DGRAM：UDP

 

建立TCP通訊端，也可以不傳遞參數，預設建立TCP通訊端

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

下面是基於python3實現的簡單的TCP服務端和用戶端

TCP使用send、recv發送和接收資料

服務端：

 1 import socket 2  3 HOST = "127.0.0.1" 4 PORT = 9999 5 BUFFSIZE = 1024 6 ADDR = (HOST, PORT) 7  8 tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 9 10 tcpSocket.bind(ADDR)11 12 tcpSocket.listen(5)13 14 while True:15     print("watting clien connection...")16     tcpClienSock, addr = tcpSocket.accept()17     print("connected from:", addr)18     while True:19         data = tcpClienSock.recv(BUFFSIZE)20         if not data:21             break22         print("i have received data: ", data)23         sendData = "hello, i have received your date: %s" % data24         tcpClienSock.send(bytes(sendData, encoding="utf-8"))25     tcpClienSock.close()26 tcpSocket.close()

用戶端：

 1 import socket 2  3 HOST = "127.0.0.1" 4 PORT = 9999 5 BUFFSIZE = 1024 6 ADDR = (HOST, PORT) 7  8 tcpClientSock = socket.socket() 9 r = tcpClientSock.connect(ADDR)10 print(r)11 12 while True:13     data = input(">>")14     if data == "q" or data == "quit":15         break16     tcpClientSock.send(bytes(data, encoding="utf-8"))17     recvData = tcpClientSock.recv(BUFFSIZE)18     if not recvData:19         break20     print(recvData)21 tcpClientSock.close()

 

接下來是簡單的UDP伺服器和用戶端實現

UDP使用sendto、recvfrom發送和接收資料

UDP伺服器：

 1 import socket 2  3 HOST = "127.0.0.1" 4 PORT = 9999 5 BUFFSIZE = 1024 6 ADDR = (HOST, PORT) 7 #UDP伺服器建立通訊端後，只需要綁定上IP和連接埠號碼，等待接收資料即可 8 #不需要listen和accept 9 udpSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)10 udpSocket.bind(ADDR)11 12 while True:13     print("watting message...")14     data, addr = udpSocket.recvfrom(BUFFSIZE) #會返回傳送者地址15     sendData = "hello, i have recv your date: %s" % data16     udpSocket.sendto(bytes(sendData, encoding="utf-8"), addr)17     print("receive message %s from %s" % (data, addr))18 udpSocket.close()

 

UDP用戶端：

 1 import socket 2  3 HOST = "127.0.0.1" # ‘localhost‘也可以 4 PORT = 9999 5 BUFFSIZE = 1024 6 ADDR = (HOST, PORT) 7 #建立通訊端即可發送資料，不需要connect串連 8 udpClientSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 9 10 while True:11     data = input(">>")12     if data == "q" or data == "quit":13         break14     udpClientSock.sendto(bytes(data, encoding="utf-8"), ADDR)15     recvData, addr = udpClientSock.recvfrom(BUFFSIZE)16     if not recvData:17         break18     print(recvData)19 udpClientSock.close()

 

Python網路編程筆記一