Java Spring-事件发生时向websocket发送消息

我遇到以下情况：每次触发事件时，我都需要在websocket上发送消息

MessageController.java

@Controller
public class MessageController {

    @Autowired
    private SimpMessagingTemplate template;

    @RequestMapping(path="/messages", method=POST)
    public void send(String message) {
        this.template.convertAndSend("/topic/messages", message);
    }
}

@Component
public class KafkaConsumeEventHandler implements ApplicationListener<KafkaConsumeEvent> {

    private static final Logger LOGGER = LoggerFactory.getLogger(KafkaConsumeEventHandler.class);

    public void onApplicationEvent(final KafkaConsumeEvent event) {
        LOGGER.info("event detected: publishing...");
        LOGGER.info("message to be published: {}",event.getMessage());
        //INVOKE CONTROLLER TO SEND MESSAGE HERE
        LOGGER.info("event published to websocket.");

    }

}

KafkaConsumeEventHandler.java

@Controller
public class MessageController {

    @Autowired
    private SimpMessagingTemplate template;

    @RequestMapping(path="/messages", method=POST)
    public void send(String message) {
        this.template.convertAndSend("/topic/messages", message);
    }
}

@Component
public class KafkaConsumeEventHandler implements ApplicationListener<KafkaConsumeEvent> {

    private static final Logger LOGGER = LoggerFactory.getLogger(KafkaConsumeEventHandler.class);

    public void onApplicationEvent(final KafkaConsumeEvent event) {
        LOGGER.info("event detected: publishing...");
        LOGGER.info("message to be published: {}",event.getMessage());
        //INVOKE CONTROLLER TO SEND MESSAGE HERE
        LOGGER.info("event published to websocket.");

    }

}

@组件
公共类KafkaConsumeEventHandler实现ApplicationListener{
私有静态最终记录器Logger=LoggerFactory.getLogger（KafkaConsumeEventHandler.class）；
Application event（最终卡夫卡消费事件）的公共无效{
LOGGER.info（“检测到的事件：发布…”）；
info（“要发布的消息：{}”，event.getMessage（））；
//调用控制器在此处发送消息
info（“发布到websocket的事件”）；
}
}

是否可以在事件处理程序中调用控制器的

send（）

方法？有更好的方法吗

编辑

---

如果我执行

this.template.convertAndSend（“/topic/messages”，message）在事件处理程序（自动连接SimMessagingTemplate）中，我在其上得到一个nullPointerException
创建您自己的comm服务类，其中包含可以随时调用的方法。我所做的是创建一个带有静态发送方法的
CommService
类

public class CommService {

  private static SimpMessagingTemplate template;

  public static void setTemplate(SimpMessagingTemplate tmplt) {
    template = tmplt;
  }

  public static void send(String message) {
    template.convertAndSend("/topic/messages", message);
  }
}

然后，您可以通过
ContextRefreshHandler

@Component
public class ContextRefreshedHandler implements ApplicationListener<ContextRefreshedEvent> {

  private static Logger logger = LoggerFactory.getLogger(ContextRefreshedHandler.class);

  @Autowired
  private SimpMessagingTemplate template;

  @Override
  public void onApplicationEvent(ContextRefreshedEvent event) {
    try {
      //Initialize the template for web socket messages
      CommService.setTemplate(template);
    } catch (Exception ex) {
      logger.error(getClass().getName(), ex);
    }
  }
}

谢谢，这正是我想要的。