socket之udp服务器和客户端

无连接的套接字主要协议是用户数据报协议缩写UDP。必须用SOCK_DGRAM, 即datagram(数据报)。

udp服务器端：

from socket import *
from time import ctime

HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpSerSock = socket(AF_INET, SOCK_DGRAM)
udpSerSock.bind(ADDR)

while True:
    print('waittinng for meaasge...')
    data, addr = udpSerSock.recvfrom(BUFSIZ)
    udpSerSock.sendto(b'[%s] %s' %(bytes(ctime(),encoding='utf-8'), data), addr)
    print('...received from and returned to: ', addr)
    
udpSerSock.close()

>>>

waittinng for meaasge...
...received from and returned to:  ('127.0.0.1', 60073)

udp客户端

from socket import *
from time import ctime

HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpCliSock = socket(AF_INET, SOCK_DGRAM)

while True:
    data = input('>')
    if not data:
        break
    udpCliSock.sendto( bytes(data, encoding='utf-8'), ADDR)
    data, addr = udpCliSock.recvfrom(BUFSIZ)
    if not data:
        break
    print(data.decode('utf-8'))
udpCliSock.close()
>>>

>nih
[Fri Feb  9 13:58:37 2018] nih
>hello world
[Fri Feb  9 13:59:00 2018] hello world