22 网络编程--UDP协议

1、TCP简单的一次对话，单通信

客户端：

import socket
HOST = 'localhost'
PORT = 50006
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect((HOST,PORT))
client.sendall(b'hello,python')
data = client.recv(1024)
print('Received',data)

服务端：

import socket
HOST = ''
PORT = 50006
sock_server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock_server.bind((HOST,PORT))
sock_server.listen(1)
conn,addr = sock_server.accept()

while True:
    data =conn.recv(1024)
    if not data:break
    conn.send(data)

2、循环收发数据，单通信(TCP)

客户端：

import socket
HOST = 'localhost'
PORT = 50006
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect((HOST,PORT))
while True:
    cmd = input('>>').strip()
    if not cmd:break

    client.send(cmd.encode('utf-8'))
    data = client.recv(1024)
    print('Received',data.decode('utf-8'))

服务端：

import socket
HOST = ''
PORT = 50006
sock_server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock_server.bind((HOST,PORT))
sock_server.listen(1)
conn,addr = sock_server.accept()

while True:
    data =conn.recv(1024)
    if not data:break
    conn.send(data)

3、双方都说话（TCP）

客户端：

import socket
HOST = 'localhost'
PORT = 50000
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect((HOST,PORT))
while True:
    cmd = input('>>').strip()
    if not cmd:break
    client.send(cmd.encode('utf-8'))

    data = client.recv(1024)
    print('Received',data.decode('utf-8'))

服务端：

import socket
HOST = ''
PORT = 50000
sock_server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock_server.bind((HOST,PORT))
sock_server.listen(1)


while True:
    conn, addr = sock_server.accept()
    while True:
        data =conn.recv(1024)
        print(f"收到客户端的的数据：>{data.decode('utf-8')}")
        if not data:break
        response = input('回复客户端>>').strip()
        conn.send(response.encode('utf-8'))

4、基于UDP协议实现

客户端：

import socket
ip_port = ('127.0.0.1',9000)
BUFSIZE = 1024
udp_client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

while True:
    MSG = input('>>').strip()
    udp_client.sendto(MSG.encode('utf-8'),ip_port)
    back_msg,addr = udp_client.recvfrom(BUFSIZE)
    print(back_msg.decode('utf-8'))

服务端：

import socket
ip_socket =('127.0.0.1',9000)
BUFSIZE = 1024
udp_server = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
udp_server.bind((ip_socket))

while True:
    msg,addr = udp_server.recvfrom(BUFSIZE)
    print(msg.decode('utf-8'),addr)

    response = input('>>').strip()
    udp_server.sendto(response.encode('utf-8'),addr)