Created
November 9, 2013 22:07
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simple websocket example with golang
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| <html> | |
| <head> | |
| <title>WebSocket demo</title> | |
| </head> | |
| <body> | |
| <div> | |
| <form> | |
| <label for="numberfield">Number</label> | |
| <input type="text" id="numberfield" placeholder="12"/><br /> | |
| <button type="button" id="sendBtn">Send</button> | |
| </form> | |
| </div> | |
| <div id="container"></div> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> | |
| <script type="text/javascript"> | |
| $(function () { | |
| var ws; | |
| if (window.WebSocket === undefined) { | |
| $("#container").append("Your browser does not support WebSockets"); | |
| return; | |
| } else { | |
| ws = initWS(); | |
| } | |
| function initWS() { | |
| var socket = new WebSocket("ws://localhost:8080/ws"), | |
| container = $("#container") | |
| socket.onopen = function() { | |
| container.append("<p>Socket is open</p>"); | |
| }; | |
| socket.onmessage = function (e) { | |
| container.append("<p> Got some shit:" + e.data + "</p>"); | |
| } | |
| socket.onclose = function () { | |
| container.append("<p>Socket closed</p>"); | |
| } | |
| return socket; | |
| } | |
| $("#sendBtn").click(function (e) { | |
| e.preventDefault(); | |
| ws.send(JSON.stringify({ Num: parseInt($("#numberfield").val()) })); | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "fmt" | |
| "github.com/gorilla/websocket" | |
| "io/ioutil" | |
| "net/http" | |
| ) | |
| type msg struct { | |
| Num int | |
| } | |
| func main() { | |
| http.HandleFunc("/ws", wsHandler) | |
| http.HandleFunc("/", rootHandler) | |
| panic(http.ListenAndServe(":8080", nil)) | |
| } | |
| func rootHandler(w http.ResponseWriter, r *http.Request) { | |
| content, err := ioutil.ReadFile("index.html") | |
| if err != nil { | |
| fmt.Println("Could not open file.", err) | |
| } | |
| fmt.Fprintf(w, "%s", content) | |
| } | |
| func wsHandler(w http.ResponseWriter, r *http.Request) { | |
| if r.Header.Get("Origin") != "http://"+r.Host { | |
| http.Error(w, "Origin not allowed", 403) | |
| return | |
| } | |
| conn, err := websocket.Upgrade(w, r, w.Header(), 1024, 1024) | |
| if err != nil { | |
| http.Error(w, "Could not open websocket connection", http.StatusBadRequest) | |
| } | |
| go echo(conn) | |
| } | |
| func echo(conn *websocket.Conn) { | |
| for { | |
| m := msg{} | |
| err := conn.ReadJSON(&m) | |
| if err != nil { | |
| fmt.Println("Error reading json.", err) | |
| } | |
| fmt.Printf("Got message: %#v\n", m) | |
| if err = conn.WriteJSON(m); err != nil { | |
| fmt.Println(err) | |
| } | |
| } | |
| } |
see x/net/websocket
you need a return if websocket.Upgrade returns an error. (insert at line 37)
Not sure why peeps are trying to correct your code. This worked perfectly for me right out of the box. It took me forever to find a good example of using websockets in a golang based web app. Thank you!!!!
hi , please how to send 2 or many json files ???
Thanks a ton! @tmichel
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Index.html, line 29, use: "ws://" + location.host + "/ws"