# # tcp和udp的区别# tcp协议:面向连接,消息可靠,传输速度慢,消息是面向流的,无消息保护边界# udp协议:面向无连接,消息不可靠,传输速度快,消息是面向包的,有消息保护边界

tcp服务端

import socketserver=socket.socket()server_ip_port=("192.168.15.77",8002)server.bind(server_ip_port)server.listen()while 1:    conn,addr=server.accept()    flag=0    while not flag:        from_client_msg=conn.recv(1024).decode("utf-8")        print(from_client_msg)        if from_client_msg=="goodbey":            break        with open("info",mode="r",encoding="utf-8") as f:            for line in f:                if line==from_client_msg:                    print("登陆成功")                    conn.send("登陆成功".encode("utf-8"))                    flag=1                    break            else:                print("用户名或密码错误")                conn.send("用户名或密码错误".encode("utf-8"))    print("连接断开中....")    conn.close()server.close()tcp客户端

import socketclient=socket.socket()server_ip_port=("192.168.15.77",8002)client.connect(server_ip_port)while 1:    client_msg=input("请输入用户名和密码输入goodbey断开")    client.send(client_msg.encode("utf-8"))    if client_msg=="goodbey":        break    from_server_msg=client.recv(1024).decode("utf-8")    if from_server_msg=="登陆成功":        print(from_server_msg)        break    if from_server_msg=="用户名或密码错误":        print(from_server_msg)        continueclient.close()udp服务端

import socketfrom socket import SOL_SOCKET,SO_REUSEADDRserver=socket.socket(type=socket.SOCK_DGRAM)server.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)server_ip_port=("192.168.15.77",8005)server.bind(server_ip_port)while 1:    from_client_msg,addr=server.recvfrom(1024)    from_client_msg=from_client_msg.decode("utf-8")    print(from_client_msg)    el = "sb"    if el in from_client_msg:        from_client_msg=from_client_msg.replace(el,"alexsb")    msg=input("请输入你要回复的内容")    msg=from_client_msg+msg    server.sendto(msg.encode("utf-8"),addr)server.close()udp客户端

import socketclient=socket.socket(type=socket.SOCK_DGRAM)server_ip_port=("192.168.15.77",8005)while 1:    msg=input("请输入:")    client.sendto(msg.encode("utf-8"),server_ip_port)    from_server_msg,addr=client.recvfrom(1024)    print(from_server_msg.decode("utf-8"))client.close()