python TCP编程

1.socket
服务端和客户端通过socket套接字进行通信

2.服务端

import socket
import threading


def tcp_handler(connect_sock, addr):
    print('accept connection from %s:%s' % addr)
    # 向客户端发送消息
    connect_sock.send(b'welcome!')
    while True:
        # 阻塞，接收客户端消息
        data = connect_sock.recv(1024)
        if not data or data.decode('utf-8') == 'exit':
            break
        # 向客户端发送消息响应
        connect_sock.send(b'hello %s' % data)
    # 关闭连接socket
    connect_sock.close()
    print('connection from %s:%s closed' % addr)

# 创建socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 绑定地址，端口
server_socket.bind(('127.0.0.1', 9999))

# 监听连接, 参数为等待连接的最大数目
server_socket.listen(5)

print('waiting for connection')

# 循环接收来自客户单的连接请求
while True:
    # 接收客户端连接，返回新的连接socket，客户端地址
    connect_sock, addr = server_socket.accept()
    # 创建新线程，处理TCP连接
    t = threading.Thread(target=tcp_handler, args=(connect_sock, addr))
    t.start()

3.客户端

import socket

# 创建socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 建立连接
client_socket.connect(('127.0.0.1', 9999))

# 阻塞，接收欢迎消息
print(client_socket.recv(1024))

for data in [b'shijingjing', b'renjiangfeng', b'huiyunyun']:
    # 发送数据
    client_socket.send(data)
    print(client_socket.recv(2014))

client_socket.send(b'exit')

client_socket.close()

4.运行结果
运行服务端tcp_server.py：

运行客户端tcp_client.py：