node.js:向TCP套接字发送和接收字节

const net = require('net');

// 创建TCP服务器
const server = net.createServer((socket) => {
  // 监听套接字的data事件，接收客户端发送的数据
  socket.on('data', (data) => {
    console.log('Received:', data.toString());
    
    // 向客户端发送数据
    socket.write('Hello from server!');
  });
  
  // 监听套接字的end事件，客户端断开连接时触发
  socket.on('end', () => {
    console.log('Client disconnected');
  });
});

// 启动服务器，监听指定端口
server.listen(3000, () => {
  console.log('Server started on port 3000');
});