基于若依ruoyi-nbcio增加flowable流程待办消息的提醒，并提供右上角的红字数字提醒（二）

更多ruoyi-nbcio功能请看演示系统

gitee源代码地址

前后端代码： https://gitee.com/nbacheng/ruoyi-nbcio

演示地址：RuoYi-Nbcio后台管理系统

1、重写websocketserver，如下，这里主要是用到了redis的订阅机制，具体也可以看相关文章：

package com.ruoyi.common.websocket;

import cn.hutool.json.JSONUtil;
import lombok.extern.slf4j.Slf4j;

import com.alibaba.fastjson.JSONObject;
import com.ruoyi.common.constant.WebsocketConst;
import com.ruoyi.common.core.domain.BaseProtocol;
import com.ruoyi.common.redis.NbcioRedisClient;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;
import com.ruoyi.common.base.BaseMap;

// @ServerEndpoint 声明并创建了webSocket端点, 并且指明了请求路径
// id 为客户端请求时携带的参数, 用于服务端区分客户端使用

/**
 * @ServerEndpoint 声明并创建了websocket端点, 并且指明了请求路径
 * userId 为客户端请求时携带的用户userId, 用于区分发给哪个用户的消息
 * @author nbacheng
 * @date 2023-09-20
*/

@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}") //此注解相当于设置访问URL
public class WebSocketServer {

    private Session session;

    private String userId;

    private static final String REDIS_TOPIC_NAME = "socketHandler";

    @Resource
    private NbcioRedisClient nbcioRedisClient;

    /**
     * 缓存 webSocket连接到单机服务class中（整体方案支持集群）
     */
    private static CopyOnWriteArraySet<WebSocketServer> webSockets = new CopyOnWriteArraySet<>();
    private static Map<String, Session> sessionPool = new HashMap<String, Session>();


    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】有新的连接，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }


    /**
     * 服务端推送消息
     *
     * @param userId
     * @param message
     */
    public void pushMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        if (session != null && session.isOpen()) {
            try {
                synchronized (session){
                    log.info("【websocket消息】 单点消息:" + message);
                    session.getBasicRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 服务器端推送消息
     */
    public void pushMessage(String message) {
        try {
            webSockets.forEach(ws -> ws.session.getAsyncRemote().sendText(message));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    @OnMessage
    public void onMessage(String message) {
        //todo 现在有个定时任务刷，应该去掉
        log.debug("【websocket消息】收到客户端消息:" + message);
        JSONObject obj = new JSONObject();
        //业务类型
        obj.put(WebsocketConst.MSG_CMD, WebsocketConst.CMD_CHECK);
        //消息内容
        obj.put(WebsocketConst.MSG_TXT, "心跳响应");
        for (WebSocketServer webSocket : webSockets) {
            webSocket.pushMessage(message);
        }
    }

    /**
     * 后台发送消息到redis
     *
     * @param message
     */
    public void sendMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        BaseMap baseMap = new BaseMap();
        baseMap.put("userId", "");
        baseMap.put("message", message);
        nbcioRedisClient.sendMessage(REDIS_TOPIC_NAME, baseMap);
    }

    /**
     * 此为单点消息
     *
     * @param userId
     * @param message
     */
    public void sendMessage(String userId, String message) {
        BaseMap baseMap = new BaseMap();
        baseMap.put("userId", userId);
        baseMap.put("message", message);
        nbcioRedisClient.sendMessage(REDIS_TOPIC_NAME, baseMap);
    }

    /**
     * 此为单点消息(多人)
     *
     * @param userIds
     * @param message
     */
    public void sendMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            sendMessage(userId, message);
        }
    }

}

2、RedisConfig增加监听器

/**
	 * redis 监听配置
	 *
	 * @param redisConnectionFactory redis 配置
	 * @return
	 */
	@Bean
	public RedisMessageListenerContainer redisContainer(RedisConnectionFactory redisConnectionFactory, RedisReceiver redisReceiver, MessageListenerAdapter commonListenerAdapter) {
		RedisMessageListenerContainer container = new RedisMessageListenerContainer();
		container.setConnectionFactory(redisConnectionFactory);
		container.addMessageListener(commonListenerAdapter, new ChannelTopic(GlobalConstants.REDIS_TOPIC_NAME));
		return container;
	}


	@Bean
	MessageListenerAdapter commonListenerAdapter(RedisReceiver redisReceiver) {
		MessageListenerAdapter messageListenerAdapter = new MessageListenerAdapter(redisReceiver, "onMessage");
		messageListenerAdapter.setSerializer(jacksonSerializer());
		return messageListenerAdapter;
	}
	
	private Jackson2JsonRedisSerializer jacksonSerializer() {
		Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
		ObjectMapper objectMapper = new ObjectMapper();
		objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
		objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
		jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
		return jackson2JsonRedisSerializer;
	}

3、RedisReceiver 如下：

package com.ruoyi.common.redis;


import org.springframework.stereotype.Component;

import com.ruoyi.common.base.BaseMap;
import com.ruoyi.common.constant.GlobalConstants;
import com.ruoyi.common.redis.listener.NbcioRedisListener;
import com.ruoyi.common.utils.SpringContextHolder;

import cn.hutool.core.util.ObjectUtil;
import lombok.Data;

/**
 *  接受消息并调用业务逻辑处理器
 *  @author nbacheng
 *  @date 2023-09-20
 */
@Component
@Data
public class RedisReceiver {

    public void onMessage(BaseMap params) {
        Object handlerName = params.get(GlobalConstants.HANDLER_NAME);
        NbcioRedisListener messageListener = SpringContextHolder.getHandler(handlerName.toString(), NbcioRedisListener.class);
        if (ObjectUtil.isNotEmpty(messageListener)) {
            messageListener.onMessage(params);
        }
    }

}

文章来源地址https://uudwc.com/A/LakGo