Springboot Websocket Stomp 消息订阅推送

需求背景

闲话不扯，直奔主题。需要和web前端建立长链接，互相实时通讯，因此想到了websocket，后面随着需求的变更，需要用户订阅主题，实现消息的精准推送，发布订阅等，则想到了STOMP(Simple Text-Orientated Messaging Protocol) 面向消息的简单文本协议。

websocket协议

想到了之前写的一个websocket长链接的demo，也贴上代码供大家参考。

pom文件
直接引入spring-boot-starter-websocket即可。

<dependency> <groupId> org.springframework.boot </groupId> <artifactId> spring-boot-starter-websocket </artifactId> </dependency>

声明websocket endpoint

import org . springframework . context . annotation . Bean ; import org . springframework . context . annotation . Configuration ; import org . springframework . web . socket . server . standard . ServerEndpointExporter ;   /** * @ClassName WebSocketConfig * @Author scott * @Date 2021/6/16 * @Version V1.0 **/ @Configuration public class WebSocketConfig {   /** * 注入一个ServerEndpointExporter,该Bean会自动注册使用@ServerEndpoint注解申明的websocket endpoint */ @Bean public ServerEndpointExporter serverEndpointExporter () { return new ServerEndpointExporter (); }   }

websocket实现类，其中通过注解监听了各种事件，实现了推送消息等相关逻辑

import com . google . common . cache . Cache ; import com . google . common . cache . CacheBuilder ; import com . ruoyi . common . core . domain . AjaxResult ; import org . slf4j . Logger ; import org . slf4j . LoggerFactory ; import org . springframework . stereotype . Component ;   import javax . websocket .*; import javax . websocket . server . PathParam ; import javax . websocket . server . ServerEndpoint ; import java . util . Objects ; import java . util . Set ; import java . util . concurrent . ConcurrentMap ; import java . util . concurrent . TimeUnit ; import java . util . concurrent . atomic . AtomicInteger ;   /** * @ClassName: DataTypePushWebSocket * @Author: scott * @Date: 2021/6/16 **/ @ServerEndpoint ( value = "/ws/dataType/push/{token}" ) @Component public class DataTypePushWebSocket {   private static final Logger log = LoggerFactory . getLogger ( DataTypePushWebSocket . class );   /** * 记录当前在线连接数 */ private static AtomicInteger onlineCount = new AtomicInteger ( 0 );   private static Cache < String , Session > SESSION_CACHE = CacheBuilder . newBuilder () . initialCapacity ( 10 ) . maximumSize ( 300 ) . expireAfterWrite ( 10 , TimeUnit . MINUTES ) . build ();   /** * 连接建立成功调用的方法 */ @OnOpen public void onOpen ( Session session , @PathParam ( "token" ) String token ) { String sessionId = session . getId (); onlineCount . incrementAndGet (); // 在线数加1 this . sendMessage ( "sessionId:" + sessionId + ",已经和server建立连接" , session ); SESSION_CACHE . put ( sessionId , session ); log . info ( "有新连接加入：{}，当前在线连接数为：{}" , session . getId (), onlineCount . get ()); }   /** * 连接关闭调用的方法 */ @OnClose public void onClose ( Session session , @PathParam ( "token" ) String token ) { onlineCount . decrementAndGet (); // 在线数减1 SESSION_CACHE . invalidate ( session . getId ()); log . info ( "有一连接关闭：{}，当前在线连接数为：{}" , session . getId (), onlineCount . get ()); }   /** * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息 */ @OnMessage public void onMessage ( String message , Session session , @PathParam ( "token" ) String token ) { log . info ( "服务端收到客户端[{}]的消息:{}" , session . getId (), message ); this . sendMessage ( "服务端已收到推送消息:" + message , session ); }   @OnError public void onError ( Session session , Throwable error ) { log . error ( "发生错误" ); error . printStackTrace (); }   /** * 服务端发送消息给客户端 */ private static void sendMessage ( String message , Session toSession ) { try { log . info ( "服务端给客户端[{}]发送消息{}" , toSession . getId (), message ); toSession . getBasicRemote (). sendText ( message ); } catch ( Exception e ) { log . error ( "服务端发送消息给客户端失败：{}" , e ); } }   public static AjaxResult sendMessage ( String message , String sessionId ){ Session session = SESSION_CACHE . getIfPresent ( sessionId ); if ( Objects . isNull ( session )){ return AjaxResult . error ( "token已失效" ); } sendMessage ( message , session ); return AjaxResult . success (); }   public static AjaxResult sendBroadcast ( String message ){ long size = SESSION_CACHE . size (); if ( size <= 0 ){ return AjaxResult . error ( "当前没有在线客户端，无法推送消息" ); } ConcurrentMap < String , Session > sessionConcurrentMap = SESSION_CACHE . asMap (); Set < String > keys = sessionConcurrentMap . keySet (); for ( String key : keys ) { Session session = SESSION_CACHE . getIfPresent ( key ); DataTypePushWebSocket . sendMessage ( message , session ); }   return AjaxResult . success ();   }   }

至此websocket服务端代码已经完成。

stomp协议

前端代码.这个是在某个vue工程中写的js，各位大佬自己动手改改即可。其中Settings.wsPath是后端定义的ws地址例如ws://localhost:9003/ws

import Stomp from 'stompjs' import Settings from '@/settings.js'   export default { // 是否启用日志 默认启用 debug : true , // 客户端连接信息 stompClient :{}, // 初始化 init ( callBack ){ this . stompClient = Stomp . client ( Settings . wsPath ) this . stompClient . hasDebug = this . debug this . stompClient . connect ({}, suce =>{ this . console ( "连接成功,信息如下 ↓" ) this . console ( this . stompClient ) if ( callBack ){ callBack () } }, err => { if ( err ) { this . console ( "连接失败,信息如下 ↓" ) this . console ( err ) } }) }, // 订阅 sub ( address , callBack ){ if (! this . stompClient . connected ){ this . console ( "没有连接,无法订阅" ) return } // 生成 id let timestamp = new Date (). getTime () + address this . console ( "订阅成功 -> " + address ) this . stompClient . subscribe ( address , message => { this . console ( address + " 订阅消息通知,信息如下 ↓" ) this . console ( message ) let data = message . body callBack ( data ) },{ id : timestamp }) }, unSub ( address ){ if (! this . stompClient . connected ){ this . console ( "没有连接,无法取消订阅 -> " + address ) return } let id = "" for ( let item in this . stompClient . subscriptions ){ if ( item . endsWith ( address )){ id = item break } } this . stompClient . unsubscribe ( id ) this . console ( "取消订阅成功 -> id:" + id + " address:" + address ) }, // 断开连接 disconnect ( callBack ){ if (! this . stompClient . connected ){ this . console ( "没有连接,无法断开连接" ) return } this . stompClient . disconnect (() =>{ console . log ( "断开成功" ) if ( callBack ){ callBack () } }) }, // 单位 秒 reconnect ( time ){ setInterval (() =>{ if (! this . stompClient . connected ){ this . console ( "重新连接中..." ) this . init () } }, time * 1000 ) }, console ( msg ){ if ( this . debug ){ console . log ( msg ) } }, // 向订阅发送消息 send ( address , msg ) { this . stompClient . send ( address ,{}, msg ) } }

后端stomp config,里面都有注释，写的很详细,并且我加入了和前端的心跳ping pong。

package com . cn . scott . config ;   import org . springframework . context . annotation . Configuration ; import org . springframework . messaging . simp . config . MessageBrokerRegistry ; import org . springframework . scheduling . concurrent . ThreadPoolTaskScheduler ; import org . springframework . web . socket . config . annotation . EnableWebSocketMessageBroker ; import org . springframework . web . socket . config . annotation . StompEndpointRegistry ; import org . springframework . web . socket . config . annotation . WebSocketMessageBrokerConfigurer ;   /** * @ClassName: WebSocketStompConfig * @Author: scott * @Date: 2021/7/8 **/ @Configuration @EnableWebSocketMessageBroker public class WebSocketStompConfig implements WebSocketMessageBrokerConfigurer {   private static long HEART_BEAT = 10000 ;   @Override public void registerStompEndpoints ( StompEndpointRegistry registry ) { //允许使用socketJs方式访问，访问点为webSocket，允许跨域 //在网页上我们就可以通过这个链接 //ws://127.0.0.1:port/ws来和服务器的WebSocket连接 registry . addEndpoint ( "/ws" ). setAllowedOrigins ( "*" ); }   @Override public void configureMessageBroker ( MessageBrokerRegistry registry ) { ThreadPoolTaskScheduler te = new ThreadPoolTaskScheduler (); te . setPoolSize ( 1 ); te . setThreadNamePrefix ( "wss-heartbeat-thread-" ); te . initialize (); //基于内存的STOMP消息代理来代替mq的消息代理 //订阅Broker名称,/user代表点对点即发指定用户，/topic代表发布广播即群发 //setHeartbeatValue 设置心跳及心跳时间 registry . enableSimpleBroker ( "/user" , "/topic" ). setHeartbeatValue ( new long []{ HEART_BEAT , HEART_BEAT }). setTaskScheduler ( te ); //点对点使用的订阅前缀，不设置的话，默认也是/user/ registry . setUserDestinationPrefix ( "/user/" ); } }

后端stomp协议接受、订阅等动作通知

package com . cn . scott . ws ;   import com . alibaba . fastjson . JSON ; import org . springframework . beans . factory . annotation . Autowired ; import org . springframework . messaging . handler . annotation . DestinationVariable ; import org . springframework . messaging . handler . annotation . MessageMapping ; import org . springframework . messaging . simp . SimpMessagingTemplate ; import org . springframework . messaging . simp . annotation . SubscribeMapping ; import org . springframework . web . bind . annotation . RestController ;   /** * @ClassName StompSocketHandler * @Author scott * @Date 2021/6/30 * @Version V1.0 **/ @RestController public class StompSocketHandler {   @Autowired private SimpMessagingTemplate simpMessagingTemplate ;   /** * @MethodName: subscribeMapping * @Description: 订阅成功通知 * @Param: [id] * @Return: void * @Author: scott * @Date: 2021/6/30 **/ @SubscribeMapping ( "/user/{id}/listener" ) public void subscribeMapping ( @DestinationVariable ( "id" ) final long id ) { System . out . println ( ">>>>>>用户:" + id + ",已订阅" ); SubscribeMsg param = new SubscribeMsg ( id , String . format ( "用户【%s】已订阅成功" , id )); sendToUser ( param ); }   /** * @MethodName: test * @Description: 接收订阅topic消息 * @Param: [id, msg] * @Return: void * @Author: scott * @Date: 2021/6/30 **/ @MessageMapping ( value = "/user/{id}/listener" ) public void UserSubListener ( @DestinationVariable long id , String msg ) { System . out . println ( "收到客户端:" + id + ",的消息" ); SubscribeMsg param = new SubscribeMsg ( id , String . format ( "已收到用户【%s】发送消息【%s】" , id , msg )); sendToUser ( param ); }   @GetMapping ( "/refresh/{userId}" ) public void refresh ( @PathVariable Long userId , String msg ) { StompSocketHandler . SubscribeMsg param = new StompSocketHandler . SubscribeMsg ( userId , String . format ( "服务端向用户【%s】发送消息【%s】" , userId , msg )); sendToUser ( param ); }   /** * @MethodName: sendToUser * @Description: 推送消息给订阅用户 * @Param: [userId] * @Return: void * @Author: scott * @Date: 2021/6/30 **/ public void sendToUser ( SubscribeMsg screenChangeMsg ){ //这里可以控制权限等。。。 simpMessagingTemplate . convertAndSendToUser ( screenChangeMsg . getUserId (). toString (), "/listener" , JSON . toJSONString ( screenChangeMsg )); }   /** * @MethodName: sendBroadCast * @Description: 发送广播，需要用户事先订阅广播 * @Param: [topic, msg] * @Return: void * @Author: scott * @Date: 2021/6/30 **/ public void sendBroadCast ( String topic , String msg ){ simpMessagingTemplate . convertAndSend ( topic , msg ); }   /** * @ClassName: SubMsg * @Author: scott * @Date: 2021/6/30 **/ public static class SubscribeMsg { private Long userId ; private String msg ; public SubscribeMsg ( Long UserId , String msg ){ this . userId = UserId ; this . msg = msg ; } public Long getUserId () { return userId ; } public String getMsg () { return msg ; } } }

连接展示

建立连接成功，这里可以看出是基于websocket协议

连接信息

ping pong

调用接口向订阅用户1发送消息,http://localhost:9003/refresh/1?msg=HelloStomp,可以在客户端控制台查看已经收到了消息。这个时候不同用户通过自己的userId可以区分订阅的主题，可以做到通过userId精准的往客户端推送消息。

还记得我们在后端配置的时候还指定了广播的订阅主题/topic，这时我们前端通过js只要订阅了这个主题，那么后端在像这个主题推送消息时，所有订阅的客户端都能收到，感兴趣的小伙伴可以自己试试，api我都写好了。

至此，实战完毕，喜欢的小伙伴麻烦关注加点赞。

springboot + stomp后端源码地址: https://gitee测试数据/ErGouGeSiBaKe/stomp-server

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原文链接：https://blog.csdn.net/u010786653/article/details/118578178

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