socket 创建UDP服务器和客户端

 

服务器端代码：

from socket import *
from time import ctime

HOST = ''
PORT = 1234
ADDR = (HOST, PORT)
BUFSIZE = 1024

def main():
    udpSer = socket(AF_INET, SOCK_DGRAM)
    udpSer.bind(ADDR)
    while True:
        print('waiting for message...')
        data, adr = udpSer.recvfrom(BUFSIZE)  #通过函数recvfrom返回元祖（消息，地址）
        data = '[%s]%s' % (ctime(), data.decode('UTF-8'))
        udpSer.sendto(bytes(data, 'UTF-8'), adr) #通过函数sento发送消息到adr地址
        print('...received from and returned to:', adr)
        
    udpSer.close()

main()

客户端代码：

from socket import *
from time import ctime

HOST = 'LOCALHOST'
PORT = 1234
ADDR = (HOST, PORT)
BUFSIZE = 1024

def main():
    udpCli = socket(AF_INET, SOCK_DGRAM)
    while True:
        data = input('>')
        if not data:
            break;
        udpCli.sendto(bytes(data, 'UTF-8'), ADDR)
        data, addr= udpCli.recvfrom(BUFSIZE)
        data = data.decode('UTF-8')
        if not data:
            break;
        print (data)
    udpCli.close()

main()