golang tcp套接字

我有这个tcp插座

package main

import (
  "fmt"
  "io"
  "log"
  "net"
  "bytes"
)

func main() {

  l, err := net.Listen("tcp", ":1200")
  if err != nil {
    log.Fatal(err)
  }
  defer l.Close()
  for {

    conn, err := l.Accept()
    if err != nil {
      log.Fatal(err)
    }

    go func(c net.Conn) {

      var buf bytes.Buffer
      io.Copy(&buf, c)
      fmt.Println("total size:", buf.Len())
      s := buf.String()
      println(s)

      c.Close()
    }(conn)
  }
}

接受一条消息，将其转换为字符串并显示它，但是如果连接没有被客户端关闭，我就不能像预期的那样看到服务器上显示的消息

如何在不需要关闭客户端连接的情况下（由客户端）从客户端发送多条消息？

这里是NodeJs中的客户端

var net = require('net');

let packet = {
              Target: { Host: "", Port: "9000" },
              Name: { Family: "Newmarch", Personal: "Jan" },
              Email: [
                      { Kind: "home", Address: "jan@newmarch.name"},
                      { Kind: "work", Address: "j.newmarch@boxhill.edu.au"}
                     ]
}


var client = new net.Socket();
client.connect(1200, '0.0.0.0', function() {
  console.log('Connected');
  client.write( (new Buffer(JSON.stringify(packet), 'UTF-8')) );
  client.end();
  //client.write('\n');
});

client.on('data', function(data) {
  console.log('Received: ' + data);
  client.destroy();
});

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

谢谢valeriano cossu