Springboot Websocket Stomp 消息订阅推送

目录

• 需求背景
• websocket协议
• stomp协议

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.com/ErGouGeSiBaKe/stomp-server

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