SpringCloud(若依微服务版为例)集成WebSocket实现前后端的消息推送

偏执的太偏执、 2022-11-06 00:58 192阅读 0赞

# 场景 #

SpringBoot+Vue整合WebSocket实现前后端消息推送：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/114392573][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_114392573]

若依微服务版手把手教你本地搭建环境并运行前后端项目：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/109363303][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_109363303]

在上面介绍了在SpringBoot+Vue的基础上使用WebSocket的过程以及使用SpringCloud(若依微服务版)搭建项目的基础上，如果在SpringCloud中使用WebSocket的过程。

注：

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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# 实现 #

首先在需用集成WebSocket的服务下面添加WebSocket的依赖

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

这里是放在定时任务服务下面

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

然后在项目包路径下新建config目录，在此目录下新建WebSocketConfig配置类

import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.socket.server.standard.ServerEndpointExporter;
    
    @Configuration
    public class WebSocketConfig {
    
        @Bean
        public ServerEndpointExporter serverEndpointExporter(){
            return  new ServerEndpointExporter();
        }
    }

然后在包下新建websocket目录，在此目录下新建WebSocketClient客户端实体类用来存储连接的会话个uri

import javax.websocket.Session;
    
    public class WebSocketClient {
        // 与某个客户端的连接会话，需要通过它来给客户端发送数据
        private Session session;
    
        //连接的uri
        private String uri;
    
        public Session getSession() {
            return session;
        }
    
        public void setSession(Session session) {
            this.session = session;
        }
    
        public String getUri() {
            return uri;
        }
    
        public void setUri(String uri) {
            this.uri = uri;
        }
    }

然后还在此目录下新建WebSocketService服务类

import org.apache.commons.lang.StringUtils;
    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.io.IOException;
    import java.util.concurrent.ConcurrentHashMap;
    
    @ServerEndpoint(value = "/websocket/{userName}")
    @Component
    public class WebSocketService {
    
        private static final Logger log = LoggerFactory.getLogger(WebSocketService.class);
    
        //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
        private static int onlineCount = 0;
        //concurrent包的线程安全Set，用来存放每个客户端对应的WebSocketServer对象。
        private static ConcurrentHashMap<String, WebSocketClient> webSocketMap = new ConcurrentHashMap<>();
    
    
        /**与某个客户端的连接会话，需要通过它来给客户端发送数据*/
        private Session session;
        /**接收userName*/
        private String userName="";
        /**
         * 连接建立成功调用的方法*/
        @OnOpen
        public void onOpen(Session session, @PathParam("userName") String userName) {
            if(!webSocketMap.containsKey(userName))
            {
                addOnlineCount(); // 在线数 +1
            }
            this.session = session;
            this.userName= userName;
            WebSocketClient client = new WebSocketClient();
            client.setSession(session);
            client.setUri(session.getRequestURI().toString());
            webSocketMap.put(userName, client);
    
            log.info("----------------------------------------------------------------------------");
            log.info("用户连接:"+userName+",当前在线人数为:" + getOnlineCount());
            try {
                sendMessage("来自后台的反馈：连接成功");
            } catch (IOException e) {
                log.error("用户:"+userName+",网络异常!!!!!!");
            }
        }
    
        /**
         * 连接关闭调用的方法
         */
        @OnClose
        public void onClose() {
            if(webSocketMap.containsKey(userName)){
                webSocketMap.remove(userName);
                if(webSocketMap.size()>0)
                {
                    //从set中删除
                    subOnlineCount();
                }
            }
            log.info("----------------------------------------------------------------------------");
            log.info(userName+"用户退出,当前在线人数为:" + getOnlineCount());
        }
    
        /**
         * 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) {
            log.info("收到用户消息:"+userName+",报文:"+message);
            //可以群发消息
            //消息保存到数据库、redis
            if(StringUtils.isNotBlank(message)){
    
            }
        }
    
        /**
         *
         * @param session
         * @param error
         */
        @OnError
        public void onError(Session session, Throwable error) {
            log.error("用户错误:"+this.userName+",原因:"+error.getMessage());
            error.printStackTrace();
        }
    
        /**
         * 连接服务器成功后主动推送
         */
        public void sendMessage(String message) throws IOException {
            synchronized (session){
                this.session.getBasicRemote().sendText(message);
            }
        }
    
        /**
         * 向指定客户端发送消息
         * @param userName
         * @param message
         */
        public static void sendMessage(String userName,String message){
            try {
                WebSocketClient webSocketClient = webSocketMap.get(userName);
                if(webSocketClient!=null){
                    webSocketClient.getSession().getBasicRemote().sendText(message);
                }
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException(e.getMessage());
            }
        }
    
    
        public static synchronized int getOnlineCount() {
            return onlineCount;
        }
    
        public static synchronized void addOnlineCount() {
            WebSocketService.onlineCount++;
        }
    
        public static synchronized void subOnlineCount() {
            WebSocketService.onlineCount--;
        }
    
        public static void setOnlineCount(int onlineCount) {
            WebSocketService.onlineCount = onlineCount;
        }
    
    
        public static ConcurrentHashMap<String, WebSocketClient> getWebSocketMap() {
            return webSocketMap;
        }
    
        public static void setWebSocketMap(ConcurrentHashMap<String, WebSocketClient> webSocketMap) {
            WebSocketService.webSocketMap = webSocketMap;
        }
    
        public Session getSession() {
            return session;
        }
    
        public void setSession(Session session) {
            this.session = session;
        }
    
        public String getUserName() {
            return userName;
        }
    
        public void setUserName(String userName) {
            this.userName = userName;
        }
    
    }

注意这里引入的WebSocketClient是上面新建的

找到网关的配置文件，这里是使用Nacos作为配置中心。将websocket的路径放开权限认证

这里是在ruoyi-gateway-dev.xml最后面的ignore-whites下面添加

- /schedule/websocket/**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

这里是将websocket放在定时任务这个服务下面，这个服务的路由也在网关的配置文件中

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

然后为了简单化以及演示，这里直接在使用websocket的连接时直接不走网关，直接调用定时任务服务下的端口的服务

为了进行推送的测试，需要使用websocket客户端的测试工具，具体可自行解决，或者使用下面的工具

[https://download.csdn.net/download/BADAO\_LIUMANG\_QIZHI/15630118][https_download.csdn.net_download_BADAO_LIUMANG_QIZHI_15630118]

这里直接使用9203是具体定时任务服务的地址，而不是网关的端口，然后连接的地址为

ws://localhost:9203/websocket/badao

其中badao是传递的UserName参数，输入地址后点击连接，可以看到连接成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

并且点击发送数据

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

后台也会收到。

然后在后台新建一个测试的接口

@RestController
    @RequestMapping("/schedule/websocket")
    public class WebSocketTestController {
    
        @GetMapping("/push")
        public void push(SysJobLog sysJobLog)
        {
            WebSocketService.sendMessage("badao","badao");
        }
    }

调用此接口后，客户端也会收到发送的数据

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

这里是使用客户端工具来测试websocket，然后前端Vue集成websocket和上面的博客的集成流程一样。

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_114392573]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/114392573
[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_109363303]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/109363303
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: /images/20221023/31ee0efb41524dc48f77a01845d0ae0a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: /images/20221023/398f28dc1f8b45db890a636bb835db53.png
[https_download.csdn.net_download_BADAO_LIUMANG_QIZHI_15630118]: https://download.csdn.net/download/BADAO_LIUMANG_QIZHI/15630118
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