基于UDP协议的socket

PS：udp是无连接的，先启动那一端都不会报错

server端

import socket  # 导入socket模块udp_sk = socket.socket(type=socket.SOCK_DGRAM)  # 创建一个服务器套接字udp_sk.bind(('127.0.0.1', 8080))  # 绑定服务器套接字msg, addr = udp_sk.recvfrom(1024)  # 接收客户端信息print(msg)  # 输出客户端的信息udp_sk.sendto(b'hi', addr)  # 向客户端发送信息udp_sk.close()  # 关闭服务器套接字

client端

import socketsk = socket.socket(type=socket.SOCK_DGRAM)ip_port = ('127.0.0.1', 8080)udp_sk = sk.sendto(b'hello', ip_port)msg, addr = udp_sk.recvfrom(1024)print(msg.decode('utf-8'))

QQ聊天

server端

import socketip_port = ('127.0.0.1', 8080)udp_server_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)udp_server_sock.bind(ip_port)while True:    qq_msg, addr = udp_server_sock.recvfrom(1024)    print('来自%s:%s' % (str(addr), qq_msg.decode('utf-8')))    back_msg = input('回复消息:').strip()    udp_server_sock.sendto(back_msg.encode('utf-8'), addr)

client端

import socketBUFSIZE = 1024udp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)qq_name_dic = {'路人甲': ('127.0.0.1', 8080),               '路人乙': ('127.0.0.1', 8080),               '路人丙': ('127.0.0.1', 8080)}while True:    qq_name = input('请选择聊天对象,输入q结束程序：').strip()    if qq_name == 'q': break    while True:        msg = input('请输入消息,回车发送,输入q结束和他的聊天:').strip()        if msg == 'q': break        if not msg or not qq_name or qq_name not in qq_name_dic: continue        udp_client_socket.sendto(msg.encode('utf-8'), qq_name_dic[qq_name])        msg, addr = udp_client_socket.recvfrom(BUFSIZE)        print('来自 %s 的一条消息:%s'%(str(addr), msg.decode('utf-8')))udp_client_socket.close()

时间服务器

server端

import socketimport timesk = socket.socket()sk.bind(('127.0.0.1', 8090))sk.listen()while True:    conn, addr = sk.accept()    while True:        ret = conn.recv(1024).decode('utf-8')        time.sleep(1)        new_time = time.strftime(ret, time.localtime(time.time()))        conn.send(new_time.encode('utf-8'))

client端

import socketsk = socket.socket()sk.connect(('127.0.0.1', 8090))while True:    sk.send('%Y-%m-%d %X'.encode('utf-8'))    msg = sk.recv(1024)    print('' + str(msg.decode('utf-8')), end='', flush=True)

socket参数的详解

socket.socket(family=AF_INET,type=SOCK_STREAM,proto=0,fileno=None)

创建socket对象的参数说明

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