The text of this text connection is: http://blog.csdn.net/freewebsys/article/details/46882777 reprint please must indicate the source!
1, about WebSocket
HTML5 defines the WebSocket protocol to better conserve server resources and bandwidth and to achieve real-time communication.
The WebSocket protocol is also implemented in JavaEE7.
In the WebSocket API, browsers and servers only need to do a handshake, and then a fast channel is formed between the browser and the server. The data can be transmitted to each other directly between the two.
Reference:
Http://baike.baidu.com/link?url=gSdXNTHdO4W0jS-lqdo3VOL0VDTyTh7YLXV1amAT5cEsMIgn5u0Sbay4fMJeqOiX4vaWn9E4ttit3Dxv2A_KGK
2, install WebSocket
Use the Golang official NET package below the WebSocket, address:
Https://github.com/golang/net
First set the Go_path variable, refer to:
http://blog.csdn.net/freewebsys/article/details/46695513
Download NET package, install WebSocket module
#全部模块下载get github.com/golang/net#做下软连接把github文件夹下面的映射到golang.org下，否则其他模块如html安装不上。ln -s /usr/local/go_path/src/github.com/golang/net /usr/local/go_path/src/golang.org/x/net#安装websocket模块go install golang.org/x/net/websocket
The package structure of this module is unified into Golang.org/x/net. Imported using Import "Golang.org/x/net/websocket".
Document in: (Godoc is a very good site, all Golang documents are on top.) ）
Https://godoc.org/golang.org/x/net/websocket
3, code and run
Code:
Https://github.com/golang-samples/websocket
Server code: Eventually, it hangs on the HTTP server.
Package Mainimport ("Golang.org/x/net/websocket" "FMT" "Log" "Net/http") func Echohandler (ws *websocket. Conn) {msg: = make ([]byte, +NErr: = ws. Read (msg)if Err! = Nil {Log. Fatal (Err)} FMT. Printf ("Receive:%s\n", Msg[:n]) send_msg: ="["+string(Msg[:n]) +"]"MErr: = 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()) }}Client WebSocket calling code:
PackageMainImport("Golang.org/x/net/websocket" "FMT" "Log")varOrigin ="http://127.0.0.1:8080/"varURL ="Ws://127.0.0.1:8080/echo"funcMain () {WS, Err: = WebSocket. Dial (URL,"", origin)ifErr! =Nil{log. Fatal (ERR)} message: = []byte("Hello, world!.") _, err = ws. Write (Message)ifErr! =Nil{log. Fatal (Err)} FMT. Printf ("Send:%s\n", message)varmsg = Make([]byte, +) m, err: = ws. Read (msg)ifErr! =Nil{log. Fatal (Err)} FMT. Printf ("Receive:%s\n", msg[:m]) ws. Close ()//Close connection}The client uses WebSocket. Dial (URL, "", origin) makes a websocket connection, but the origin parameter is not actually called.
Use WebSocket to send and receive data. The interesting thing is that if both the client and the server are written with go, the object is WebSocket. function calls are all the same, except that you write a read data.
4,HTML5 Call
Using jquery. Using Baidu's CDN:
http://cdn.code.baidu.com/
HTML5 page Code:
<! DOCTYPE html><html><head> <meta charset="UTF-8"/> <title>Sample of WebSocket with Golang</title> <script src="Http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"> </script> <script> $ (function () { var ws = new We Bsocket ( "Ws://localhost:8080/echo" ); Ws.onmessage = function ( e) { $ (). Text (Event.data). AppendTo ($ul); }; var $ul = $ ( ' #msg-list ' ); $ ( ' #sendBtn ' ). Click ( function () { var data = $ ( ' #name ' ). Val (); Ws.send (data); }); }); </script></head><body><input id="name" type="text"/><input type="button" id="sendbtn" value ="Send"/><ul id="Msg-list"></ul></body></html>When the button is clicked, WebSocket receives the OnMessage event and then displays the data to the page.
The browser displays the WebSocket connection status.
5, summary
The text of this text connection is: http://blog.csdn.net/freewebsys/article/details/46882777 reprint please must indicate the source!
Developing WebSocket with Golang is straightforward.
Very convenient, because Nodejs server when the server load is suddenly high, and the Nodejs library is very miscellaneous and many, can be more difficult to solve.
I'm still more inclined to develop with Golang.
Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.
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