基于socket通信,spring
也有自己的socket通信服务:websocket
,这次就介绍如何在spring项目中使用websocket
进行通信交互。
后台:spring boot;前台:angularjs
后台建立服务
首先我们先建立起后台的服务,以实现进行socket连接。
1.引入websocket依赖
建立好一个maven项目之后,我们需要在xml
中引入websocket
的相关 依赖:
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<dependencies> <!--websocket--> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-websocket</artifactid> </dependency> <dependency> <groupid>org.webjars</groupid> <artifactid>webjars-locator-core</artifactid> </dependency> <dependency> <groupid>org.webjars</groupid> <artifactid>sockjs-client</artifactid> <version> 1.0 . 2 </version> </dependency> <dependency> <groupid>org.webjars</groupid> <artifactid>stomp-websocket</artifactid> <version> 2.3 . 3 </version> </dependency> <dependency> <groupid>org.webjars</groupid> <artifactid>bootstrap</artifactid> <version> 3.3 . 7 </version> </dependency> <dependency> <groupid>org.webjars</groupid> <artifactid>jquery</artifactid> <version> 3.1 . 0 </version> </dependency> </dependencies> |
2.配置类
引入依赖后,就需要我们进行配置类的编写:
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public class websocketconfig {} |
这个类需要实现一个接口,来帮助我们进行socket
的连接,并接受发送过来的消息。比如下面这样:
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package com.mengyunzhi.springmvcstudy.config; import org.springframework.context.annotation.configuration; import org.springframework.messaging.simp.config.messagebrokerregistry; import org.springframework.web.socket.config.annotation.enablewebsocketmessagebroker; import org.springframework.web.socket.config.annotation.stompendpointregistry; import org.springframework.web.socket.config.annotation.websocketmessagebrokerconfigurer; @configuration @enablewebsocketmessagebroker public class websocketconfig implements websocketmessagebrokerconfigurer { @override public void configuremessagebroker(messagebrokerregistry config) { config.enablesimplebroker( "/topic" ); config.setapplicationdestinationprefixes( "/server" ); } @override public void registerstompendpoints(stompendpointregistry registry) { //注册stomp协议节点,同时指定使用sockjs协议 registry .addendpoint( "/websocket-server" ) .setallowedorigins( "*" ) .withsockjs(); } } |
通常的配置我就不在这里解释了,值得一提的是,我们使用了@enablewebsocketmessagebroker
这个注解,从字面上我们不难猜出,它表示支持websocket
提供的消息代理。
然后我们实现configuremessagebroker()
方法,来配置消息代理。在这个方法中,我们先调用enablesimplebroker()
来创建一个基于内存的消息代理,他表示以/topic
为前缀的消息将发送回客户端。接着设置一个请求路由前缀,它绑定了@messagemapping
(这个后面会用到)注解,表示以/server
为前缀的消息,会发送到服务器端。
最后实现了registerstompendpoints()
方法,用来注册/websocket-server
端点来建立服务器。
3.控制器
这时我们要建立一个供前台访问的接口来发送消息。
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@messagemapping ( "/hello" ) @sendto ( "/topic/greetings" ) public greeting greeting(hellomessage message) throws exception { thread.sleep( 1000 ); // simulated delay return new greeting( "hello, " + htmlutils.htmlescape(message.getname()) + "!" ); } |
其中@messagemapping
注解就是我们前面提到的,前台会将消息发送到/server/hello
这里。
然后还有一个@sendto
注解,它表示服务器返回给前台的消息,会发送到/topic/greeting
这里。
前台客户端
服务器部分建立好后,接着我们就要去建立客户端部分
1.客户端界面
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<!doctype html> <html> <head> <title>hello websocket</title> <link href= "/webjars/bootstrap/css/bootstrap.min.css" rel= "external nofollow" rel= "stylesheet" > <link href= "/main.css" rel= "external nofollow" rel= "stylesheet" > <script src= "/webjars/jquery/jquery.min.js" ></script> <script src= "/webjars/sockjs-client/sockjs.min.js" ></script> <script src= "/webjars/stomp-websocket/stomp.min.js" ></script> <script src= "/app.js" ></script> </head> <body> <noscript><h2 style= "color: #ff0000" >seems your browser doesn't support javascript! websocket relies on javascript being enabled. please enable javascript and reload this page!</h2></noscript> <div id= "main-content" class = "container" > <div class = "row" > <div class = "col-md-6" > <form class = "form-inline" > <div class = "form-group" > <label for = "connect" >websocket connection:</label> <button id= "connect" class = "btn btn-default" type= "submit" >connect</button> <button id= "disconnect" class = "btn btn-default" type= "submit" disabled= "disabled" >disconnect </button> </div> </form> </div> <div class = "col-md-6" > <form class = "form-inline" > <div class = "form-group" > <label for = "name" >what is your name?</label> <input type= "text" id= "name" class = "form-control" placeholder= "your name here..." > </div> <button id= "send" class = "btn btn-default" type= "submit" >send</button> </form> </div> </div> <div class = "row" > <div class = "col-md-12" > <table id= "conversation" class = "table table-striped" > <thead> <tr> <th>greetings</th> </tr> </thead> <tbody id= "greetings" > </tbody> </table> </div> </div> </div> </body> </html> |
这部分没什么说的,主要就是其中引的连个js文件:
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<script src= "/webjars/sockjs-client/sockjs.min.js" ></script> <script src= "/webjars/stomp-websocket/stomp.min.js" ></script> |
这两个文件帮助我们利用sockjs
和stomp
实现客户端。
创建逻辑
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var stompclient = null ; function setconnected(connected) { $( "#connect" ).prop( "disabled" , connected); $( "#disconnect" ).prop( "disabled" , !connected); if (connected) { $( "#conversation" ).show(); } else { $( "#conversation" ).hide(); } $( "#greetings" ).html( "" ); } function connect() { var socket = new sockjs( '/websocket-server' ); stompclient = stomp.over(socket); stompclient.connect({}, function (frame) { setconnected( true ); console.log( 'connected: ' + frame); stompclient.subscribe( '/topic/greetings' , function (greeting) { showgreeting(json.parse(greeting.body).content); }); }); } function disconnect() { if (stompclient !== null ) { stompclient.disconnect(); } setconnected( false ); console.log( "disconnected" ); } function sendname() { stompclient.send( "/server/hello" , {}, json.stringify({ 'name' : $( "#name" ).val()})); } function showgreeting(message) { $( "#greetings" ).append( "<tr><td>" + message + "</td></tr>" ); } $(function () { $( "form" ).on( 'submit' , function (e) { e.preventdefault(); }); $( "#connect" ).click(function() { connect(); }); $( "#disconnect" ).click(function() { disconnect(); }); $( "#send" ).click(function() { sendname(); }); }); |
这个文件主要注意connect()
和sendname()
这两个方法。
最后实现的效果如下:
官方文档:
https://spring.io/guides/gs/messaging-stomp-websocket/
https://docs.spring.io/spring/docs/4.3.20.release/spring-framework-reference/htmlsingle/#websocket
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://segmentfault.com/a/1190000016976733