网络编程是许多应用的核心，Python 提供了强大的 socket 库，方便我们构建客户端和服务器程序。
本文将带你一步步实现一个简单的多人聊天室，实现消息的收发和广播。

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一、Socket 基础介绍

• socket.socket() 创建套接字

• 服务器使用 bind() 绑定地址，listen() 监听连接

• 客户端使用 connect() 连接服务器

• send() 和 recv() 发送和接收数据

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二、服务器端代码示例

python

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import socket import threading clients = [] def handle_client(client_socket): while True: try: message = client_socket.recv(1024).decode('utf-8') if not message: break broadcast(message, client_socket) except: clients.remove(client_socket) client_socket.close() break def broadcast(message, sender_socket): for client in clients: if client != sender_socket: try: client.send(message.encode('utf-8')) except: clients.remove(client) client.close() def main(): server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind(('0.0.0.0', 5555)) server.listen(5) print("服务器启动，等待连接...") while True: client_socket, addr = server.accept() print(f"连接来自 {addr}") clients.append(client_socket) thread = threading.Thread(target=handle_client, args=(client_socket,)) thread.start() if __name__ == '__main__': main()

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三、客户端代码示例

python

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import socket import threading def receive_messages(sock): while True: try: msg = sock.recv(1024).decode('utf-8') if msg: print(msg) except: break def main(): client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) client.connect(('127.0.0.1', 5555)) threading.Thread(target=receive_messages, args=(client,), daemon=True).start() while True: msg = input() if msg == 'exit': break client.send(msg.encode('utf-8')) if __name__ == '__main__': main()

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四、运行流程

1. 启动服务器脚本

2. 启动多个客户端脚本，输入消息

3. 消息会被服务器接收并广播给所有其他客户端

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五、总结与扩展建议

知识点	说明
多线程	处理多个客户端并发连接
消息广播	将消息发送给除发送者外的所有客户端
异常处理	保证客户端断开时服务器稳定运行

你还可以进一步完善：

• 添加用户名和登录验证

• 支持私聊和群聊功能

• 增加图形界面（如 Tkinter）

• 使用加密协议保障安全

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