python Socket之客户端和服务端握手详解

import socket  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # 建立连接: s.connect(('127.0.0.1', 9999)) # 接收欢迎消息: print(s.recv(1024).decode('utf-8')) for data in [b'Michael', b'Tracy', b'Sarah']:  # 发送数据:  s.send(data)  print(s.recv(1024).decode('utf-8')) s.send(b'exit') s.close() 

import socket import threading import time # from threading import Thread   s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # 监听端口: s.bind(('127.0.0.1', 9999)) s.listen(5) print('Waiting for connection...')  def tcplink(sock, addr):  print('Accept new connection from %s:%s...' % addr)  sock.send(b'Welcome!')  while True:   data = sock.recv(1024)   time.sleep(1)   if not data or data.decode('utf-8') == 'exit':    break   sock.send(('Hello, %s!' % data.decode('utf-8')).encode('utf-8'))  sock.close()  print('Connection from %s:%s closed.' % addr)  while True:  # 接受一个新连接:  sock, addr = s.accept()  # 创建新线程来处理TCP连接:  t = threading.Thread(target=tcplink, args=(sock, addr))  t.start()