TCP以及UDP服務端和客戶端

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)#最多可以和5個客戶端鏈結
client,addr=server.accept()#接受第乙個到達的訊息
data=client.recv(max_size)#最大可接受的訊息長度
print('at',datetime.now(),client,'said',data)
client.sendall(b'are you talking to me?')
client.close()
server.close()

starting the server at 2019-09-30 16:11:45.591459

waiting for a client to call.

at 2019-09-30 16:12:44.752999 said b』hey!』

tcp_client.py

import socket

from datetime import datetime
address=('localhost',6789)
max_size=1000
print('starting the client at',datetime.now())
#換成sock_stream來使用流協議tcp,使用connect來建立流
client=socket.socket(socket.af_inet,socket.sock_stream)
client.connect(address)
client.sendall(b'hey!')#tcp伺服器使用sendall()發生訊息
data=client.recv(max_size)
print('at',datetime.now(),'someone replied',data)
client.close()

starting the client at 2019-09-30 16:12:44.752525

at 2019-09-30 16:12:44.753091 someone replied b』are you talking to me?』

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()

tarting the client at 2019-09-30 16:22:39.000430

at 2019-09-30 16:22:39.000861 (『127.0.0.1』, 6789) said b』are you talking to me?』

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.')
#埠的所有資料到套接字
server=socket.socket(socket.af_inet,socket.sock_dgram)
#af_inet表示建立乙個網際網路套接字,sock_dgram表示我們要傳送和接受資料報
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()

tarting the client at 2019-09-30 16:22:39.000430

at 2019-09-30 16:22:39.000861 (『127.0.0.1』, 6789) said b』are you talking to me?』

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