我正在尝试使用弹簧绑定来运行发布者和订户。
确保目的地(交换(是在兔-MQ上本地创建的。
Publisher(app.yml(
spring:
cloud:
stream:
bindings:
output:
destination: HelloDestination
rabbitmq:
addresses: xxx.xxx.xx.xxx
订阅者(app.yml(
spring:
cloud:
stream:
bindings:
input:
destination: HelloDestination
rabbitmq:
addresses: xxx.xxx.xx.xxx
server:
port: 8081
发布者(pom.yml(
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
<version>2.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
用户(pom.yml(
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
<version>2.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
Publisher(源Java文件(
@SpringBootApplication
@EnableBinding(Source.class)
public class Demo1Application {
//@Autowired
//private static MessageChannel output;
public static void main(String[] args) {
SpringApplication.run(Demo1Application.class, args);
String sampleMessage = "Hello";
Message<String> message =
MessageBuilder.withPayload("Hello World").build();
MessageChannel output = new DirectChannel();
output.send(message);
}
}
//消费者(源文件(
@SpringBootApplication
@EnableBinding(Sink.class)
public class Demo2Application {
public static void main(String[] args) {
SpringApplication.run(Demo2Application.class, args);
}
@StreamListener(Sink.INPUT)
public void listenerMethod(Message<String> message)
{
System.out.println("The Message is :"+message);
}
}
//-----
完成所有操作后,我看到了创建的交换以及交换中的消息。消费者开始时很好。但是生产者试图用错误消息发送消息时会窒息
Exception in thread "main" org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'unknown.channel.name'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=Hello World, headers={id=ccf86001-5dba-6c64-bc76-e1f58782de42, timestamp=1558883876384}], failedMessage=GenericMessage [payload=Hello World, headers={id=ccf86001-5dba-6c64-bc76-e1f58782de42, timestamp=1558883876384}]
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:461)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:401)
at com.example.demo.Demo1Application.main(Demo1Application.java:29)
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=Hello World, headers={id=ccf86001-5dba-6c64-bc76-e1f58782de42, timestamp=1558883876384}]
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:138)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscri
我希望该消息被读取。
您需要从Run((方法返回的应用程序上下文而不是创建自己的DirectChannel。