二十三、 Redis 发布订阅模式

(参考：【进阶篇】2.16 Redis 消息传递发布订阅模式详解_redis发布订阅模式-优快云博客

)

1，页面message/index.vue（系统管理/通知通告）从下拉操作“点击发布”

2，接受请求

src/main/java/org/jeecg/modules/system/controller/SysAnnouncementController.java

@RequestMapping(value = "/doReleaseData", method = RequestMethod.GET)
public Result<SysAnnouncement> doReleaseData(…)

（1）将本通告保存为“已发送”

（2）调用websocket，发送点对点消息

webSocket.sendMessage(obj.toJSONString());

webSocket.sendMessage(userIds, obj.toJSONString());

（3）redis的订阅发布模式下的监听器

src/main/java/org/jeecg/modules/message/websocket/SocketHandler.java

监听消息(通过redis发布订阅，推送消息)
* 此方案：解决集群部署的问题，多实例节点（也就是发送消息端先发送消息到redis中，每个服务节点收到redis消息，再触发具体的ws推送）

SocketHandler.java àonMessage()

Redis初始化配置类

org.jeecg.common.modules.redis.config.RedisConfig.java

配置监听容器jeecg_redis_topic

@Bean
public RedisMessageListenerContainer redisContainer(RedisConnectionFactory redisConnectionFactory, RedisReceiver redisReceiver, MessageListenerAdapter commonListenerAdapter) {
    RedisMessageListenerContainer container = new RedisMessageListenerContainer();
    container.setConnectionFactory(redisConnectionFactory);
    container.addMessageListener(commonListenerAdapter, new ChannelTopic("jeecg_redis_topic"));
    return container;
}

(4) 同步企业微信、钉钉的消息通知
Response<String> dtResponse = dingtalkService.sendActionCardMessage(sysAnnouncement, null, true);
wechatEnterpriseService.sendTextCardMessage(sysAnnouncement, true);