golang实现websocket
Posted xingyunshizhe
tags:
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1.需要的websocket的包：
"github.com/gorilla/websocket"
package main
import (
"github.com/gorilla/websocket"
"learngo/websocket/impl"
"net/http"
"time"
)
var(
upgrader = websocket.Upgrader
//允许跨域访问
CheckOrigin: func(r *http.Request) bool
return true
,
)
func wsHandler(w http.ResponseWriter, r *http.Request)
//w.Write([]byte("hello"))
//收到http请求(upgrade),完成websocket协议转换
//在应答的header中放上upgrade:websoket
var (
wsConn *websocket.Conn
err error
data []byte
conn *impl.Connection
)
//Upgrade websocket(返回给客户端的消息)
if wsConn, err = upgrader.Upgrade(w, r, nil); err !=nil
//报错了，直接返回底层的websocket链接就会终断掉
return
if conn, err = impl.InitConnection(wsConn); err != nil
goto ERR
//心跳
go func()
var(
err error
)
for
if err = conn.WriteMessage([]byte("heatbeat")); err != nil
return
time.Sleep(5*time.Second)
()
for
if data, err = conn.ReadMessage(); err != nil
goto ERR
if err = conn.WriteMessage(data); err != nil
goto ERR
ERR:
conn.Close()
func userHandler(w http.ResponseWriter, r *http.Request)
w.Write([]byte("Hello World!"))
func main()
//http://localhost:7777/ws
http.HandleFunc("/ws", wsHandler)
http.HandleFunc("/user", userHandler)
//服务端启动
http.ListenAndServe("0.0.0.0:7777", nil)
实现模块：线程安全
package main
import (
"github.com/gorilla/websocket"
"net/http"
)
var(
upgrader = websocket.Upgrader
//允许跨域访问
CheckOrigin: func(r *http.Request) bool
return true
,
)
func wsHandler(w http.ResponseWriter, r *http.Request)
//w.Write([]byte("hello"))
//收到http请求(upgrade),完成websocket协议转换
//在应答的header中放上upgrade:websoket
var (
conn *websocket.Conn
err error
//msgType int
data []byte
)
if conn, err = upgrader.Upgrade(w, r, nil); err !=nil
//报错了，直接返回底层的websocket链接就会终断掉
return
//得到了websocket.Conn长连接的对象，实现数据的收发
for
//Text(json), Binary
//if _, data, err = conn.ReadMessage(); err != nil
if _, data, err = conn.ReadMessage(); err != nil
//报错关闭websocket
goto ERR
//发送数据，判断返回值是否报错
if err = conn.WriteMessage(websocket.TextMessage, data); err != nil
//报错了
goto ERR
//error的标签
ERR:
conn.Close()
func helloHandler(w http.ResponseWriter, r *http.Request)
w.Write([]byte("Hello World!"))
func main()
//http://localhost:7777/ws
http.HandleFunc("/ws", wsHandler)
http.HandleFunc("/hello", helloHandler)
//服务端启动
http.ListenAndServe("0.0.0.0:7777", nil)
js文件：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> window.addEventListener("load", function(evt) var output = document.getElementById("output"); var input = document.getElementById("input"); var ws; var print = function(message) var d = document.createElement("div"); d.innerHTML = message; output.appendChild(d); ; document.getElementById("open").onclick = function(evt) if (ws) return false; ws = new WebSocket("ws://192.168.230.130:7777/ws"); ws.onopen = function(evt) print("OPEN"); ws.onclose = function(evt) print("CLOSE"); ws = null; ws.onmessage = function(evt) print("RESPONSE: " + evt.data); ws.onerror = function(evt) print("ERROR: " + evt.data); return false; ; document.getElementById("send").onclick = function(evt) if (!ws) return false; print("SEND: " + input.value); ws.send(input.value); return false; ; document.getElementById("close").onclick = function(evt) if (!ws) return false; ws.close(); return false; ; ); </script> </head> <body> <table> <tr><td valign="top" width="50%"> <p>Click "Open" to create a connection to the server, "Send" to send a message to the server and "Close" to close the connection. You can change the message and send multiple times. </p> <form> <button id="open">Open</button> <button id="close">Close</button> <input id="input" type="text" value="Hello world!"> <button id="send">Send</button> </form> </td><td valign="top" width="50%"> <div id="output"></div> </td></tr></table> </body> </html>
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