s = socket.socket (socket_family, socket_type, protocol = 0)

#sever.pyimport socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)host = socket.gethostname()port = 8088s.bind((host,port))try:    while True:        receive_data,addr = s.recvfrom(1024)        print("来自服务器" + str(addr) + "的消息:")        print(receive_data.decode('utf-8'))        msg = input('please input send to msg:')        s.sendto(msg.encode('utf-8'),addr)except:    s.close()

#client.pyimport sockets = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)try:    while True:        host = socket.gethostname()        port = 8088        send_data = input('please input msg:')        s.sendto(send_data.encode('utf-8'),(host,port))        msg,addr = s.recvfrom(1024)        print("来自服务器" + str(addr) + "的消息:")        print(msg.decode('utf-8'))except:    s.close()

#server.pyimport socketimport logging
def main():    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  # 创建socket对象
    addr = ('127.0.0.1', 9999)    s.bind(addr)  # 绑定地址和端口
    logging.info('UDP Server on %s:%s...', addr[0], addr[1])
    user = {}  # 存放字典{addr:name}    while True:        try:            data, addr = s.recvfrom(1024)  # 等待接收客户端消息存放在2个变量data和addr里            if not addr in user:  # 如果addr不在user字典里则执行以下代码                for address in user:  # 从user遍历数据出来address                    s.sendto(data + ' 进入聊天室...'.encode('utf-8'), address)  # 发送user字典的data和address到客户端                user[addr] = data.decode('utf-8')  # 接收的消息解码成utf-8并存在字典user里,键名定义为addr                continue  # 如果addr在user字典里，跳过本次循环
            if 'EXIT'.lower() in data.decode('utf-8'):#如果EXIT在发送的data里                name = user[addr]   #user字典addr键对应的值赋值给变量name                user.pop(addr)      #删除user里的addr                for address in user:    #从user取出address                    s.sendto((name + ' 离开了聊天室...').encode(), address)     #发送name和address到客户端            else:                   print('"%s" from %s:%s' %(data.decode('utf-8'), addr[0], addr[1]))                  for address in user:    #从user遍历出address                    if address != addr:  #address不等于addr时间执行下面的代码                        s.sendto(data, address)     #发送data和address到客户端
        except ConnectionResetError:            logging.warning('Someone left unexcept.')
if __name__ == '__main__':    main()

#clinet.pyimport socketimport threading
def recv(sock, addr):    '''    一个UDP连接在接收消息前必须要让系统知道所占端口    也就是需要send一次，否则win下会报错    '''    sock.sendto(name.encode('utf-8'), addr)    while True:        data = sock.recv(1024)        print(data.decode('utf-8'))

def send(sock, addr):    '''        发送数据的方法        参数：            sock：定义一个实例化socket对象            server：传递的服务器IP和端口    '''    while True:        string = input('')        message = name + ' : ' + string        data = message.encode('utf-8')        sock.sendto(data, addr)        if string.lower() == 'EXIT'.lower():            break
def main():    '''        主函数执行方法，通过多线程来实现多个客户端之间的通信    '''    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)    server = ('127.0.0.1', 9999)    tr = threading.Thread(target=recv, args=(s, server), daemon=True)    ts = threading.Thread(target=send, args=(s, server))    tr.start()    ts.start()    ts.join()    s.close()
if __name__ == '__main__':    print("-----欢迎来到聊天室,退出聊天室请输入'EXIT(不分大小写)'-----")    name = input('请输入你的名称:')    print('-----------------%s------------------' % name)    main()