Node.js Socket 客户端和服务端通讯并且服务端返回客户端 IP

用来看路由器WAN口IP

服务端代码：

const net = require('net');

const server = net.createServer((socket) => {
  console.log('Client connected');

  const clientAddress = socket.remoteAddress;
  console.log(`Client IP address is ${clientAddress}`);

  socket.on('data', (data) => {
    console.log(`Received from client: ${data}`);
    socket.write(`Hello from server! Your IP address is ${clientAddress}`);
  });

  socket.on('end', () => {
    console.log('Client disconnected');
  });
});

server.listen(3000, () => {
  console.log('Server started on port 3000');
});

客户端代码：

const net = require('net');

const client = new net.Socket();

client.connect(3000, 'localhost', () => {
  console.log('Connected to server');

  client.write('Hello from client!');
});

client.on('data', (data) => {
  console.log(`Received from server: ${data}`);
  client.destroy();
});

client.on('close', () => {
  console.log('Connection closed');
});

在客户端代码中，我们连接到了服务端并发送了一条消息。在收到服务端的回复后，客户端关闭了连接。

在实际使用中，可以根据需要更改客户端和服务端代码，并在需要发送和接收数据时进行修改。服务端也可以使用 Socket.io 等其他第三方库实现实时通讯功能。