Node.js 基础篇（十五）：Socket 编程（一）：基于 Net 模块的 Socket 编程

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用终端来演示聊天室：

1.1 ServerSocket.js

const server = new net.createServer()

let clients = {
    
    }
let clientName = 0

server.on('connection', (client) => {
    
    
  client.name = ++clientName
  clients[client.name] = client

  client.on('data', (msg) => {
    
    
    // console.log('客户端传来：' + msg);
    broadcast(client, msg.toString())
  })

  client.on('error', (e) => {
    
    
    console.log('client error' + e);
    client.end()
  })

  client.on('close', () => {
    
    
    delete clients[client.name]
    console.log(client.name + ' 下线了');
  })
})

const broadcast = (client, msg) => {
    
    
  for (let key in clients) {
    
    
    clients[key].write(client.name + ' 说：' + msg)
  }
}

server.listen(9000, 'localhost', () => {
    
    
  console.log('opened server on', server.address());
})

1.2 ClientSocket.js

const net = require('net')
const readline = require('readline')

const port = 9000
const host = '127.0.0.1'

const socket = new net.Socket()

socket.setEncoding = 'UTF-8'

socket.connect(port, host, () => {
    
    
  socket.write('上线了.')
})

socket.on('data', (msg) => {
    
    
  console.log(msg.toString())
  say()
})

socket.on('error', (err) => {
    
    
  console.log('error' + err);
})

socket.on('close', () => {
    
    
  console.log('connection closeed');
})

const r1 = readline.createInterface({
    
    
  input: process.stdin,
  output: process.stdout
})

const say = () => {
    
    
  r1.question('', (inputMsg) => {
    
    
    if (inputMsg !== 'bye') {
    
    
      socket.write(inputMsg + '\n')
    } else {
    
    
      socket.destroy()
      r1.close()
    }
  })
}