【python】socket

UDP

udp_server.py

from datetime import datetime
import socket

server_address = ('localhost', 6789)
max_size = 4096

print('Starting the server at', datetime.now())
print('Waiting for a client to call.')
server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server.bind(server_address)

data, client = server.recvfrom(max_size)

print('At', datetime.now(), client, 'said', data)
server.sendto(b'Are you talking to me?', client)
server.close()

udp_client.py

import socket
from datetime import datetime

server_address = ('localhost', 6789)
max_size = 4096

print('Starting the client at', datetime.now())
client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
client.sendto(b'Hey!', server_address)
data, server = client.recvfrom(max_size)
print('At', datetime.now(), server, 'said', data)
client.close()

TCP

tcp_server.py

from datetime import datetime
import socket

address = ('localhost', 6789)
max_size = 1000

print('Starting the server at', datetime.now())
print('Waiting for a client to call.')
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(address)
server.listen(5) # 最多和5个客户端连接，超过5个就会拒绝

client, addr = server.accept()
data = client.recv(max_size)

print('At', datetime.now(), client, 'said', data)
client.sendall(b'Are you talking to me?')
client.close()
server.close()

tcp_client.py

import socket
from datetime import datetime

address = ('localhost', 6789)
max_size = 1000

print('Starting the client at', datetime.now())
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect(address)
client.sendall(b'Hey!')
data = client.recv(max_size)
print('At', datetime.now(), 'someone replied', data)
client.close()