golang 聊天室
近期看了一些关于golang的资料。发现它的WEBSOCKT实现真起来真的非常easy。以下是代码
go.net/websocket是须要安装的，这个自己装上即可
package main
import (
"container/list"
"fmt"
"go.net/websocket"
"io"
"net/http"
)
var connid int
var conns *list.List
func Chat(ws *websocket.Conn) {
defer ws.Close()
item := conns.PushBack(ws)
defer conns.Remove(item)
var err error
for {
var data string
if err = websocket.Message.Receive(ws, &data); err != nil {
fmt.Printf("disconnected\n")
break
}
SendMessage(item, fmt.Sprintf("%s", data))
}
}
func SendMessage(self *list.Element, data string) {
//for _, item := range conns {
for item := conns.Front(); item != nil; item = item.Next() {
ws, ok := item.Value.(*websocket.Conn)
if !ok {
panic("item not *websocket.Conn")
}
if item == self {
continue
}
io.WriteString(ws, data)
}
}
// client默认显示页面
func Client(w http.ResponseWriter, r *http.Request) {
html := `<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>golang websocket chatroom</title>
<script language="javascript"type="text/javascript">
var sock=null;
var wsuri ="ws://192.168.1.163:7878/chat"; //这里的IP假设是局域測试的话。须要换成自己的
window.onload = function(){
console.log("onload");
sock = new WebSocket(wsuri);
sock.onopen=function(e){
console.log("connected to "+wsuri);
}
sock.onclose=function(e){
console.log("connection closed (" + e.code + ")");
}
sock.onmessage=function(e){
console.log("message received: " + e.data);
document.getElementById("list").innerHTML += e.data;
var div = document.getElementById("list")
div.scrollTop = div.scrollHeight;
}
}
function send () {
var who = document.getElementById('who').value;
if (who.length == 0){
document.getElementById('who').focus();
return
}
var msg = document.getElementById('msg').value;
if (msg.length == 0){
document.getElementById('msg').focus();
return
}
var data = who + " say: " + msg + "<br/><br/>";
document.getElementById('msg').value="";
document.getElementById('who').value="";
var div = document.getElementById("list")
div.innerHTML += data;
div.scrollTop = div.scrollHeight;
sock.send(data);
}
</script>
</head>
<body>
<div id="list" style="height: 300px;overflow-y: scroll;border: 1px solid #CCC;">
</div>
<div>
who are you
<input type="text" id="who" size="60" />
your message
<input type="text" id="msg" size="60" />
<button onclick="send()">send</button>
</div>
</body>
</html>`
io.WriteString(w, html)
}
func main() {
conns = list.New()
http.Handle("/chat", websocket.Handler(Chat))
http.HandleFunc("/", Client)
err := http.ListenAndServe(":7878", nil)
if err != nil {
panic("ListenAndServe: " + err.Error())
}
}
