2015-05-12 11:56
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Golang服务器,如何接收TCP JSON数据包?

I'm new to Golang and am using the "Server" code here as a starting point:

I've attempted to use JSON instead of Gob decoding (since I am required to write the client in C#), and I'm sending the JSON TCP data client data in a separate script from the code below.

I'm stuck on the part where I'm actually receiving the JSON TCP data and storing it in a variable for it to be decoded. It looks like I can decode it with json.Unmarshal, but I can't find any examples where json.Unmarshal is being used to decode TCP data. I can only find examples where json.Unmarshal is being used to decode JSON strings.

My code is below:

package main

import (

type coordinate struct {
  X float64 `json:"x"`
  Y float64 `json:"y"`
  Z float64 `json:"z"`

func server() {
  // listen on a port
  ln, err := net.Listen("tcp", ":9999")
  if err != nil {
  for {
    // accept a connection
    c, err := ln.Accept()
    if err != nil {
    // handle the connection
    go handleServerConnection(c)

func handleServerConnection(c net.Conn) {
  // receive the message
  var msg coordinate

Stuck on the line below. What could I set the rawJSON variable equal to?

  err := json.Unmarshal([]byte(rawJSON), &msg)
  if err != nil {
  } else {
    fmt.Println("Received", msg)


func main() {
  go server()

  //let the server goroutine run forever
  var input string
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