微信公众号搜"智元新知"关注
微信扫一扫可直接关注哦！

通过Spring Cloud Stream已提供RabbitMq的生产者

分类：编程问答

如何解决通过Spring Cloud Stream已提供RabbitMq的生产者

我发现自己处于一个已经提供了Rabbitmq作为给定基础结构的环境中。

A 服务A 正在写入兔子队列，而服务B 正在从队列中读取。通过密集阅读documentation并正确设置后，通过 Spring Cloud Stream Binder 作为消费者的阅读部分就像灵芝一样工作。

但是我无法设置要写入兔子队列的生产者。

设置

RabbitMq（已启动并运行）

  • 1个交易所：myExchange
  • 3个队列：myQueueA，myQueueB，myQueueC（在 myExchange 下链接）

生产者服务（上文提到的服务A ）

@Slf4j
@Component
@requiredArgsConstructor
@EnableBinding(RabbitChannelSource.class)
public class RabbitSender
{
    private final RabbitChannelSource rabbitChannelSource;


    public void sendMessage()
    {
        Message<String> msg = MessageBuilder.withPayload("TEEEEST").build();
        rabbitChannelSource.myOutput().send(msg);
    }

public interface RabbitChannelSource
{
    String MY_OUTPUT_BINDING = "my-output";

    @Output(MY_OUTPUT_BINDING)
    MessageChannel myOutput();

}

我试图使其首先在一个队列中工作，但理想情况下，我将为所有三个队列设置正确的属性。

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=user
spring.rabbitmq.password=pass

## use existing rabbitmq via bindings
spring.cloud.stream.bindings.my-output.destination=my-output
#spring.cloud.stream.bindings.my-output.group=myQueueA
spring.cloud.stream.bindings.my-output.producer.required-groups=myQueueA
spring.cloud.stream.rabbit.bindings.my-output.producer.bind-queue=false
spring.cloud.stream.rabbit.bindings.my-output.producer.declare-exchange=false
spring.cloud.stream.rabbit.bindings.my-output.producer.queueNameGroupOnly=true

bind-queue=false和declare-exchange=false是必需的，因为我拥有兔子基础结构。

但是，尽管我总是遇到同样的异常，但我不知道为什么。我的意思是我知道为什么，因为没有适当的通道来向其发送消息。因此，我怀疑这与application.properties有关。

org.springframework.messaging.MessageDeliveryException: dispatcher has no subscribers for channel 'application.my-output'.; nested exception is org.springframework.integration.MessagedispatchingException: dispatcher has no subscribers,FailedMessage=Genericmessage [payload=byte[7],headers={contentType=application/json,id=98698b4c-61fa-596d-736e-f630d3ba4626,timestamp=1605105272723}]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:453)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:403)
    at de.techem.emsreceiver.rabbitmq.RabbitSender.sendMessage(RabbitSender.java:25)
    at de.techem.emsreceiver.event.TriggeredEmsImport.execute(TriggeredImport.java:95)
    at de.techem.emsreceiver.event.TriggeredEmsImport$$FastClassBySpringcglib$$d84f31a4.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.cglibAopProxy$cglibMethodInvocation.invokeJoinpoint(cglibAopProxy.java:769)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.cglibAopProxy$cglibMethodInvocation.proceed(cglibAopProxy.java:747)
    at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
    at org.springframework.aop.framework.cglibAopProxy$cglibMethodInvocation.proceed(cglibAopProxy.java:747)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.cglibAopProxy$cglibMethodInvocation.proceed(cglibAopProxy.java:747)
    at org.springframework.aop.framework.cglibAopProxy$DynamicAdvisedInterceptor.intercept(cglibAopProxy.java:689)
    at de.techem.emsreceiver.event.TriggeredEmsImport$$EnhancerBySpringcglib$$a0878aed.execute(<generated>)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:305)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:190)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:153)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:409)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360)
    at org.springframework.boot.context.event.EventPublishingRunListener.running(EventPublishingRunListener.java:103)
    at org.springframework.boot.SpringApplicationRunListeners.running(SpringApplicationRunListeners.java:77)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
    at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.getBinderInstance(DefaultBinderFactory.java:320)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.doGetBinder(DefaultBinderFactory.java:209)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.getBinder(DefaultBinderFactory.java:140)
    at org.springframework.cloud.stream.binding.BindingService.getBinder(BindingService.java:379)
    at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:268)
    at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:291)
    at org.springframework.cloud.stream.binding.AbstractBindableProxyFactory.createAndBindOutputs(AbstractBindableProxyFactory.java:136)
    at org.springframework.cloud.stream.binding.OutputBindingLifecycle.doStartWithBindable(OutputBindingLifecycle.java:58)
    at java.base/java.util.LinkedHashMap$LinkedValues.forEach(LinkedHashMap.java:608)
    at org.springframework.cloud.stream.binding.AbstractBindingLifecycle.start(AbstractBindingLifecycle.java:57)
    at org.springframework.cloud.stream.binding.OutputBindingLifecycle.start(OutputBindingLifecycle.java:34)
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
    at de.techem.emsreceiver.EmsReceiverApplication.main(EmsReceiverApplication.java:21)

我希望能够基于routingKey写入myQueueA,myQueueB or myQueueC。因此，如果我将应用程序内部的routingKey设置为myQA，则消息应发送到myQueueA，先发送myQB，再发送到myQueueB，再发送myQC，然后发送到{ {1}}。

因此，三个不同的路由键会导致相应的兔子队列。


我很乐意提供任何帮助，因为我尝试了很多没有成功的事情。谢谢！

解决方法

也许您正在尝试在绑定之前使用绑定？这对我来说很好：

spring.cloud.stream.bindings.output.destination=my-output
spring.cloud.stream.rabbit.bindings.output.producer.declare-exchange=false
spring.cloud.stream.rabbit.bindings.output.producer.routing-key-expression=headers['routeTo']

@SpringBootApplication
@EnableBinding(Source.class)
public class So64788954Application {

    public static void main(String[] args) {
        SpringApplication.run(So64788954Application.class,args);
    }

    @Autowired
    Source source;

    @Bean
    ApplicationRunner runner() {
        return args -> {
            source.output().send(MessageBuilder.withPayload("foo")
                    .setHeader("routeTo","myQA")
                    .build());

            source.output().send(MessageBuilder.withPayload("bar")
                    .setHeader("routeTo","myQB")
                    .build());

            source.output().send(MessageBuilder.withPayload("baz")
                    .setHeader("routeTo","myQC")
                    .build());

        };
    }

    @RabbitListener(queues = { "myQueueA","myQueueB","myQueueC" } )
    void listen(String in,@Header(AmqpHeaders.CONSUMER_QUEUE) String queue) {
        System.out.println(in + ",from: " + queue);
    }

}

foo,from: myQueueA
bar,from: myQueueB
baz,from: myQueueC

带上自己的队列/交换时，生产者端不需要必需的组。

The @ RabbitListener`可以使用发送到3个队列的消息。

顺便说一句，不建议使用注释模型；现在首选函数式编程模型，其中我们使用StreamBridge进行输出（而Consumer<?>或Function<?,?>分别进行消耗和处理）。

在此等同于以上内容：

spring.cloud.stream.rabbit.bindings.my-output.producer.declare-exchange=false
spring.cloud.stream.rabbit.bindings.my-output.producer.routing-key-expression=headers['routeTo']

@SpringBootApplication
public class So64788954Application {

    public static void main(String[] args) {
        SpringApplication.run(So64788954Application.class,args);
    }

    @Autowired
    StreamBridge bridge;

    @Bean
    ApplicationRunner runner() {
        return args -> {
            bridge.send("my-output",MessageBuilder.withPayload("foo")
                    .setHeader("routeTo","myQA")
                    .build());

            bridge.send("my-output",MessageBuilder.withPayload("bar")
                    .setHeader("routeTo","myQB")
                    .build());

            bridge.send("my-output",MessageBuilder.withPayload("baz")
                    .setHeader("routeTo",from: " + queue);
    }

}
,

在加里（Gary）的建议下，我遇到了与我第一篇文章相同的错误。

application.properties 

# --- spring cloud ---
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=username
spring.rabbitmq.password=password
## use existing rabbitmq via bindings
spring.cloud.stream.bindings.output.destination=my-output
spring.cloud.stream.rabbit.bindings.output.producer.declare-exchange=false
spring.cloud.stream.rabbit.bindings.output.producer.routing-key-expression=headers['routeTo']

RabbitTrigger.java 

@Slf4j
@Component
@RequiredArgsConstructor
public class RabbitTrigger
{
    private final RabbitSender rabbitSender;


    @EventListener(ApplicationReadyEvent.class)
    public void execute()
    {
        rabbitSender.testSending();
    }

}

RabbitSender.java 

@Slf4j
@Configuration
@RequiredArgsConstructor
@EnableBinding(Source.class)
public class RabbitSender
{
    private final Source source;


    public void testSending()
    {
        Message<String> testMessage = MessageBuilder.withPayload("TEEEEST")
                                                    .setHeader("routeTo","CRE")
                                                    .build();
        source.output().send(testMessage);
    }

但是我遇到的异常与我最初发布的帖子相同。我认为我没有考虑这一点的关键部分？

2020-11-25 16:27:17,116 [main] ERROR o.s.boot.SpringApplication - Application run failed
org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'application.output'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers,failedMessage=GenericMessage [payload=byte[7],headers={routeTo=CRE,id=15479810-375f-38e8-a692-e84c6ede01d7,contentType=application/json,timestamp=1606318037108}]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:453)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:403)
    at de.techem.emsreceiver.rabbitmq.RabbitSender.testSending(RabbitSender.java:34)
    at de.techem.emsreceiver.event.RabbitTrigger.execute(RabbitTrigger.java:96)
    at de.techem.emsreceiver.event.RabbitTrigger$$FastClassBySpringCGLIB$$d84f31a4.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
    at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at de.techem.emsreceiver.event.RabbitTrigger$$EnhancerBySpringCGLIB$$d00eff49.execute(<generated>)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:305)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:190)
    at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:153)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:409)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360)
    at org.springframework.boot.context.event.EventPublishingRunListener.running(EventPublishingRunListener.java:103)
    at org.springframework.boot.SpringApplicationRunListeners.running(SpringApplicationRunListeners.java:77)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
    at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.getBinderInstance(DefaultBinderFactory.java:320)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.doGetBinder(DefaultBinderFactory.java:209)
    at org.springframework.cloud.stream.binder.DefaultBinderFactory.getBinder(DefaultBinderFactory.java:140)
    at org.springframework.cloud.stream.binding.BindingService.getBinder(BindingService.java:379)
    at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:268)
    at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:291)
    at org.springframework.cloud.stream.binding.AbstractBindableProxyFactory.createAndBindOutputs(AbstractBindableProxyFactory.java:136)
    at org.springframework.cloud.stream.binding.OutputBindingLifecycle.doStartWithBindable(OutputBindingLifecycle.java:58)
    at java.base/java.util.LinkedHashMap$LinkedValues.forEach(LinkedHashMap.java:608)
    at org.springframework.cloud.stream.binding.AbstractBindingLifecycle.start(AbstractBindingLifecycle.java:57)
    at org.springframework.cloud.stream.binding.OutputBindingLifecycle.start(OutputBindingLifecycle.java:34)
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
    at de.techem.emsreceiver.EmsReceiverApplication.main(EmsReceiverApplication.java:21)
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:139)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:106)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
    ... 60 common frames omitted

对我来说，建立生产者比在消费者方面要复杂得多。

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

苹果市值2025年有望达4万亿美元
pythonJavaScriptjavaHTMLPHPreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-boot