Finchley.SR4使用spring cloud stream, 开启多个实例，不分组，为什么只有一个实例收到消息？

Question

如题，下面贴代码了：public interface StreamClient {     String queueNameIn = "OneMessageIn";     String queueNameOut = "OneMessageOut";     @Input(queueNameIn)     SubscribableChannel input();     @Output(queueNameOut)     MessageChannel output(); }@Component @EnableBinding({StreamClient.class}) @Slf4j public class StreamReceiver {     @StreamListener(StreamClient.queueNameIn)     @SendTo(StreamClient.queueNameOut)     public SysUser oneMessageIn(SysUser sysUser) {         log.info("{}", sysUser);         return sysUser;     }     @StreamListener(StreamClient.queueNameOut)     public void oneMessageOut(SysUser sysUser) {         log.info("{}", sysUser.getAvatar());     } }@RestController @RequestMapping("/stream") public class StreamMqController {     @Autowired     private StreamClient streamClient;     @GetMapping("")     public void testQueue(){         SysUser sysUser=new SysUser();         sysUser.setAvatar("1.png");         sysUser.setName("gaojingsi");         streamClient.input().send(MessageBuilder.withPayload(sysUser).build());     } }启动了两个实例，9090和9091端口，访问9090端口，就是9090收到，访问9091，就是9091收到，想两个实例都收到怎么办啊？