英文:
Golang server, how to receive TCP JSON packet?
问题
我是你的中文翻译助手，以下是翻译好的内容：
我对Golang还不熟悉，正在使用这里的“Server”代码作为起点：http://www.golang-book.com/13/index.htm#section7
我尝试使用JSON而不是Gob解码（因为我需要用C#编写客户端），并且我将JSON TCP数据的客户端数据发送到与下面代码分开的脚本中。
我卡在实际接收JSON TCP数据并将其存储在变量中以进行解码的部分。看起来我可以使用json.Unmarshal进行解码，但我找不到任何使用json.Unmarshal解码TCP数据的示例。我只能找到使用json.Unmarshal解码JSON字符串的示例。
我的代码如下：
package mainimport ("encoding/json""fmt""net")type coordinate struct {X float64 `json:"x"`Y float64 `json:"y"`Z float64 `json:"z"`}func server() {// 监听端口ln, err := net.Listen("tcp", ":9999")if err != nil {fmt.Println(err)return}for {// 接受连接c, err := ln.Accept()if err != nil {fmt.Println(err)continue}// 处理连接go handleServerConnection(c)}}func handleServerConnection(c net.Conn) {// 接收消息var msg coordinate// 卡在下面这行。我应该将rawJSON变量设置为什么值？err := json.Unmarshal([]byte(rawJSON), &msg)if err != nil {fmt.Println(err)} else {fmt.Println("Received", msg)}c.Close()}func main() {go server()// 让服务器goroutine一直运行var input stringfmt.Scanln(&input)}
希望对你有帮助！
英文:
I'm new to Golang and am using the "Server" code here as a starting point: http://www.golang-book.com/13/index.htm#section7
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 mainimport ("encoding/json""fmt""net")type coordinate struct {X float64 `json:"x"`Y float64 `json:"y"`Z float64 `json:"z"`}func server() {// listen on a portln, err := net.Listen("tcp", ":9999")if err != nil {fmt.Println(err)return}for {// accept a connectionc, err := ln.Accept()if err != nil {fmt.Println(err)continue}// handle the connectiongo handleServerConnection(c)}}func handleServerConnection(c net.Conn) {// receive the messagevar 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 {fmt.Println(err)} else {fmt.Println("Received", msg)}c.Close()}func main() {go server()//let the server goroutine run forevervar input stringfmt.Scanln(&input)}
答案1
得分: 13
你可以直接将json.Decoder修补到连接上：
func handleServerConnection(c net.Conn) {// 创建一个直接从套接字读取的解码器d := json.NewDecoder(c)var msg coordinateerr := d.Decode(&msg)fmt.Println(msg, err)c.Close()}
这段代码的作用是处理服务器连接，并从连接中读取JSON数据并解码为coordinate类型的变量msg。然后，它打印出msg和可能的错误，并关闭连接。
英文:
You can patch a json.Decoder directly to the connection:
func handleServerConnection(c net.Conn) {// we create a decoder that reads directly from the socketd := json.NewDecoder(c)var msg coordinateerr := d.Decode(&msg)fmt.Println(msg, err)c.Close()}
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