Socket 初步

1 TCP chat server 程式：

import socket
from socket import SOL_SOCKET,SO_REUSEADDR

sk = socket.socket()
# 設定socket的可選項， 允許port重複繫結，防止程式非正常推出時， 再次執行時作業系統尚未解除端口占用。
sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

sk.bind(('127.0.0.1', 8090))
sk.listen()
print('TCP chat Server is running...
 
')
conn, addr = sk.accept()
print('%s user is connected...'%addr[0])

while True:
    content = conn.recv(1024).decode('utf-8')
    print(content)
    if content == 'bye':
        conn.send(b'bye')
        break
    info = input('>>>')
    conn.send(bytes(info, encoding='utf-8'))
conn.close()
sk.close()
 

TCP client 程式：

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8090))
sk.send(bytes('你好！', encoding='utf-8'))
while True:
    ret = sk.recv(1024).decode('utf-8')
    print(ret)
    if ret == 'bye':
        sk.send(b'bye')
        break
    info = input('>>>')
    sk.send(bytes(info,encoding
 
='utf-8'))
sk.close()

2 UDP socket , chat server 舉例