websocket服務端與客戶端

websocket服務端

package main

import (
"golang.org/x/net/websocket"
"fmt"
"log"
"net/http"
)

func echoHandler(ws *websocket.Conn) {
	msg := make([]byte, 512)
	n, err := ws.Read(msg)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Receive: %s\n", msg[:n])

	send_msg := "[" + string(msg[:n]) + "]"
	m, err := ws.Write([]byte(send_msg))
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Send: %s\n", msg[:m])
}

func main() {
	http.Handle("/echo", websocket.Handler(echoHandler))
	http.Handle("/", http.FileServer(http.Dir(".")))

	err := http.ListenAndServe(":8080", nil)

	if err != nil {
		panic("ListenAndServe: " + err.Error())
	}
}

websocket客戶端

package main

import (
	"fmt"
	"golang.org/x/net/websocket"
	"log"
)

var origin = "http://127.0.0.1:8080/"
var url = "ws://127.0.0.1:8080/echo"

func main() {
	ws, err := websocket.Dial(url, "", origin)
	if err != nil {
		log.Fatal(err)
	}
	message := []byte("hello, world!你好")
	_, err = ws.Write(message)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Send: %s\n", message)

	var msg = make([]byte, 512)
	m, err := ws.Read(msg)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Receive: %s\n", msg[:m])

	ws.Close() //關閉連接
}