Java 如何检测SpringWebSocket stomp订阅消息(帧)?

Java 如何检测SpringWebSocket stomp订阅消息(帧)?,java,spring,spring-websocket,spring-messaging,Java,Spring,Spring Websocket,Spring Messaging,我正在使用Spring5:如何检测来自Stomp客户端的SUBSCRIBE消息 根据我的理解,@SubscribeMapping应该使我的控制器方法在客户机订阅主题时被调用,但事实并非如此 这是我的服务器控制器: @Controller public class MessageController { // ... @MessageMapping("/chat/{mId}") @SendTo("/topic/messages") public OutputMe

我正在使用Spring5:如何检测来自Stomp客户端的
SUBSCRIBE
消息

根据我的理解,
@SubscribeMapping
应该使我的控制器方法在客户机订阅主题时被调用,但事实并非如此

这是我的服务器控制器:

@Controller
public 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");
    }

}
服务器配置:

@Configuration
@ComponentScan(basePackages= { "websockets" })
@EnableWebSocketMessageBroker
public 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);
    }
}
和javascript客户端:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>Chat WebSocket</title>
        <script src="sockjs.js"></script>
        <script src="stomp.js"></script>

        <script type="text/javascript">

            // ...

            function connect() {
                var sock = new SockJS('/<webapp-context>/chat');

                stompClient = Stomp.over(sock);  
                stompClient.connect({}, function(frame) {
                    setConnected(true);
                    console.log('Connected: ' + frame);
                    stompClient.subscribe('/topic/messages', function(messageOutput) {
                        showMessageOutput(JSON.parse(messageOutput.body));
                    });
                    stompClient.subscribe('/topic/messages/13', function(messageOutput) {
                        showMessageOutput(JSON.parse(messageOutput.body));
                    });
                });
            }

            // ...

        </script>
    </head>
    <body onload="/*disconnect()*/">

        <!-- ... -->

    </body>
</html>

聊天网站
// ...
函数连接(){
var sock=new SockJS('//chat');
stompClient=Stomp.over(sock);
stompClient.connect({},函数(框架){
setConnected(true);
console.log('Connected:'+frame);
stompClient.subscribe('/topic/messages',函数(messageOutput){
showMessageOutput(JSON.parse(messageOutput.body));
});
stompClient.subscribe('/topic/messages/13',函数(messageOutput){
showMessageOutput(JSON.parse(messageOutput.body));
});
});
}
// ...
该代码已从中改编

如和中所述,我可以只使用拦截器,但如何工作呢?

您需要将“topic”也注册为应用程序目标topic
config.setApplicationDestinationPrefixes({/app“,“/topic”})

否则Spring不会将订阅消息转发到应用程序,而只是将其转发到MessageBroker通道。

您需要将“topic”也注册为应用程序目标topic
config.setApplicationDestinationPrefixes({/app“,“/topic”})


否则Spring不会将subscribe消息转发到应用程序,而只是将其转发到MessageBroker频道。

就是这样!谢谢。给读者一个小提示:Spring在转发到应用程序之前去掉了
/topic
前缀。就是这样!谢谢。请读者注意:Spring在转发到应用程序之前去掉了
/topic
前缀。