Spring Boot如何知道MessageMapping是指定Jms队列还是Websocket主题？

Question

I have a Controller bean with a method such as

@MessageMapping("${my.topic}")
public void receiveCommand(Message content) {
    log.info("Received command: " + content);
}

And I also inject a SimpMessagingTemplate and a JmsMessagingTemplate into this controller. I believe the problem with my receiveCommand method is that Spring is expecting this to be a JMS message and not a WebSocket message. However this seems impossible to determine, how can I make sure that this method corresponds to a WebSocket topic and not a JMS queue?

My application is annotated with @EnableJms and @EnableWebSocket and works well for receiving JMS messages and sending WebSocket messages via STOMP, but doesn't seem to be able to receive WebSocket messages.

The message imports are as follows on my Controller.

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.messaging.Message;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.simp.SimpMessagingTemplate;
import org.springframework.stereotype.Component;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;

I also have another method that uses a JmsListener that works, so I am wondering if this is somehow picked up by Spring on the classpath and overrides the MessageMapping to be a JMS queue name.

@JmsListener(destination = "${my.destination}")
public void receiveMessage(String content) {
   System.out.println("Jms message: " + content); 
}

I do not see any stack traces or errors when running a unit test that looks like the following.

@Autowired
private SimpMessagingTemplate websocket;

@Value("${my.topic}")
private String topic;

@Test
public void shouldReceiveCommandMessages() throws IOException {
    URL url = Resources.getResource("command.json");
    String json = Resources.toString(url, Charsets.UTF_8);
    this.websocket.convertAndSend(topic, json);
}

Which is within a larger SpringBootTest that works for testing the Jms sending and receiving.

Answer 1

The SIMP template is for sending data out to connected clients; to send data into the controller you should use the STOMP Client .

4.4.6. Send Messages

What if you want to send messages to connected clients from any part of the application? Any application component can send messages to the "brokerChannel". The easiest way to do that is to have a SimpMessagingTemplate injected, and use it to send messages. Typically it should be easy to have it injected by type, for example:

4.4.15. STOMP Client

Spring provides a STOMP over WebSocket client and a STOMP over TCP client.

@Controller
class Listener {

    @MessageMapping("/string")
    public void handle(String in) {
        System.out.println("STOMP Received: " + in);
    }

    @JmsListener(destination = "so50614472")
    public void listen(String in) {
        System.out.println("JMS Received: " + in);
    }

}

and

STOMP Received: foo
JMS Received: bar