我正在使用 Spring 5：如何檢測SUBSCRIBE來自 Stomp 客戶端的消息？根據我的理解，@SubscribeMapping應該讓我的控制器方法在客戶端訂閱主題時被調用，但這并沒有發生。這是我的服務器控制器：@Controllerpublic class MessageController {    // ...    @MessageMapping("/chat/{mId}")    @SendTo("/topic/messages")    public OutputMessage send(Message message, @DestinationVariable("mId") String mid, MessageHeaders headers, MessageHeaderAccessor accessor) throws Exception {        // ...    }    @SuppressWarnings("unused")    @SubscribeMapping({ "/", "/chat", "/topic/messages", "/messages", "/*" })    public void listen(Message message, MessageHeaders headers, MessageHeaderAccessor accessor) throws Exception {        int i = 0;        System.out.println("subscribed");    }}服務器配置：@Configuration@ComponentScan(basePackages= { "websockets" })@EnableWebSocketMessageBrokerpublic class WebSocketConfig implements WebSocketMessageBrokerConfigurer {    @Override    public void configureMessageBroker(MessageBrokerRegistry config) {        config.enableSimpleBroker("/topic");        config.setApplicationDestinationPrefixes("/app");    }    @Override    public void registerStompEndpoints(StompEndpointRegistry registry) {         registry.addEndpoint("/chat");         registry.addEndpoint("/chat").withSockJS();    }    @Override    public void configureWebSocketTransport(WebSocketTransportRegistration registry) {        WebSocketMessageBrokerConfigurer.super.configureWebSocketTransport(registry);    }}