副本技能-使用RabbitMQ做即时消息通讯，使用STOMP协议

技术使用：

• 后端使用Spring Websocket通讯，
• 前端使用SocketJS，非长连接，有心跳检测
• 信息交互使用RabbitMQ的插件Stomp

安装前：

安装后：

安装步骤(我的RabbitMQ是使用的Docker)

• 1.进入Docker容器RabbitMQ的后台(docker exec -it 容器ID /bin/bash)
• 2.查看RabbitMQ的插件启用情况(rabbitmq-plugins list)
• 3.启用RabbitMQ插件（rabbitmq_stomp, rabbitmq_web_stomp）
• 4.关闭RabbitMQ服务
• 5.修改Docker的端口配置文件（hostconfig.json,config.v2.json）路径：/www/server/docker/containers/容器ID
• 6.重启Docker服务，放行服务端口
• 7.启动本地服务，可以链接成功

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    private final WebSocketProperties webSocketProperties;

    public WebSocketConfig(WebSocketProperties webSocketProperties) {
        this.webSocketProperties = webSocketProperties;
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.setApplicationDestinationPrefixes("/ws")
                .enableStompBrokerRelay("/topic")
                // rabbitmq 必须开启中继插件
                .setRelayHost(webSocketProperties.getHost())
                .setRelayPort(webSocketProperties.getStompPort())
                .setClientLogin(webSocketProperties.getUsername())
                .setClientPasscode(webSocketProperties.getPassword())
                .setSystemLogin(webSocketProperties.getUsername())
                .setSystemPasscode(webSocketProperties.getPassword())
                .setVirtualHost(webSocketProperties.getVirtualHost());
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint(SERVER_ENDPOINTS)
                .setHandshakeHandler(new UserHandshakeHandler())
                // 如果走网关，请检查网关的跨域，可能依旧有跨域
                .setAllowedOrigins("*")
                .withSockJS();
    }
}

前端代码

let gateWay = "xxx";
let token = "xxx";
// 此处路径为后端的服务端点
let socket = new SockJS(gateWay + "/center-message-service/center/msg/notification?token=" + token);
let headers = {
    "authorization":"Bearer " + token
}
stompClient = Stomp.over(socket);
stompClient.connect(headers, function (frame) {
    console.log("Connected: " + frame)
    updateNotificationDisplay();
    updateOnlineUserDisplay();
    // stomp订阅的路径不能用/，前缀/topic是前后端约定
    stompClient.subscribe('/topic/xxxx', function (message) {
        console.info(message);
        console.info("<<<<");
    });
})