Go语言用WebSocket的简单例子

标签：function websocket evt go 例子 Go WebSocket com

Go语言标准包里面没有提供对WebSocket的支持，但是在由官方维护的go.net子包中有对这个的支持，需要独立下载， Go websocket package 下载地址：http://code.google.com/p/go.net/websocket 。

Go get 命令下载：go get code.google.com/p/go.net/websocket
Go实现的WebSocket的文档：http://godoc.org/code.google.com/p/go.net/websocket

WebSocket官网提供了一个webSocket测试地址： http://www.websocket.org/echo.html 在这里输入 websocket的地址就可以进行测试。

Go服务器端源码：

package main
 
import (
    "code.google.com/p/go.net/websocket"
    "fmt"
    "log"
    "net/http"
)
 
func Echo(ws *websocket.Conn) {
var err error
 
for
 
var reply string
 
if err = websocket.Message.Receive(ws, &reply); err != nil
"Can't receive")
break
        }
 
"Received back from client: " +
 
:= "Received:  " +
"Sending to client: " +
 
if err = websocket.Message.Send(ws, msg); err != nil
"Can't send")
break
        }
    }
}
 
func
"begin")
"/", http.FileServer(http.Dir("."))) // <-- note this line
 
"/socket", websocket.Handler(Echo))
 
if err := http.ListenAndServe(":1234", nil); err != nil
"ListenAndServe:", err)
    }
 
"end")
}

测试的网页：

<!DOCTYPE html>  
<meta charset="utf-8" />
<title>WebSocket Test</title>
<script language="javascript"type="text/javascript">  
 
var wsUri ="ws://localhost:1234/socket"; 
//var wsUri = "ws://localhost/socket"; 
//var wsUri = "ws://echo.websocket.org"; 
var
function
= document.getElementById("output"); 
    testWebSocket(); 
}  
function testWebSocket() { websocket = new
= function(evt) { onOpen(evt) }; 
= function(evt) { onClose(evt) }; 
= function(evt) { onMessage(evt) }; 
= function(evt) { one rror(evt) }; }  
 
function onOpen(evt) { writeToScreen("CONNECTED"); doSend("WebSocket rocks"); }  function
"DISCONNECTED"); }  
 
function
        writeToScreen('<span style="color: blue;">RESPONSE: '+ evt.data+'</span>'); 
        websocket.close(); }  
 
function
        writeToScreen('<span style="color: red;">ERROR:</span> '+ evt.data); }  
 
function
"SENT: " +
        websocket.send(message); }  
 
function
var pre = document.createElement("p"); 
= "break-word"; 
=
 
window.addEventListener("load", init, false);  
</script>
 
 
<h2>WebSocket Test</h2>
<div id="output"></div>
  </html>

注意，测试时候测试html网页是需要在 http://localhost:1234/test.html 这样的地址进行测试。

如果用 file://localhost/Users/cybercare/go/src/websocket/test.html 测试会报错误。

Chrome浏览器可能会抛出400错误，是因为它认为你正在尝试做一个跨域请求WebSocket。即它认为你没有跨域请求的权限。You should host your html+javascript on http:// (or https://), not file://

Go语言用WebSocket的简单例子_Go