[英]How to listen to topic using spring boot jms
我正在嘗試使用以下代碼段聽取主題。 但是它默認監聽隊列。 在這種情況下沒有xml配置。 我完全依賴注釋。 此外,我完全依賴Spring引導提供的AutoConfiguration。 我不知道如何將目標類型設置為主題,在JmsListener中。 Spring JMS大師請幫忙。
@Component
public class MyTopicListener {
@JmsListener(destination = "${trans.alert.topic}")
public void receiveMessage(TransactionAlert alert) {
logger.info("AlertSubscriberEmail :: Sending Email => <" + alert + ">");
}
}
我剛從以下網站獲取了完整的Spring啟動示例: https : //github.com/spring-guides/gs-messaging-jms/
在此,它被創建用於從隊列發送和接收消息。 要將此更改為主題,您必須在Factory實例中設置Pub-Sub屬性。
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jms.DefaultJmsListenerContainerFactoryConfigurer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.jms.annotation.EnableJms;
import org.springframework.jms.config.DefaultJmsListenerContainerFactory;
import org.springframework.jms.config.JmsListenerContainerFactory;
import org.springframework.jms.connection.CachingConnectionFactory;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.support.converter.MappingJackson2MessageConverter;
import org.springframework.jms.support.converter.MessageConverter;
import org.springframework.jms.support.converter.MessageType;
import javax.jms.ConnectionFactory;
@SpringBootApplication
@EnableJms
public class JmsSampleApplication {
public void registerBeans(ConfigurableApplicationContext context ){
BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(JmsTemplate.class);
CachingConnectionFactory cachingConnectionFactory = new CachingConnectionFactory();
builder.addPropertyValue("connectionFactory", cachingConnectionFactory); // set property value
DefaultListableBeanFactory factory = (DefaultListableBeanFactory) context.getAutowireCapableBeanFactory();
factory.registerBeanDefinition("jmsTemplateName", builder.getBeanDefinition());
}
@Bean
public JmsListenerContainerFactory<?> topicListenerFactory(ConnectionFactory connectionFactory,
DefaultJmsListenerContainerFactoryConfigurer configurer) {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
factory.setPubSubDomain(true);
// This provides all boot's default to this factory, including the message converter
configurer.configure(factory, connectionFactory);
// You could still override some of Boot's default if necessary.
return factory;
}
@Bean
public JmsListenerContainerFactory<?> queueListenerFactory(ConnectionFactory connectionFactory,
DefaultJmsListenerContainerFactoryConfigurer configurer) {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
//factory.setPubSubDomain(true);
// This provides all boot's default to this factory, including the message converter
configurer.configure(factory, connectionFactory);
return factory;
}
@Bean // Serialize message content to json using TextMessage
public MessageConverter jacksonJmsMessageConverter() {
MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
converter.setTargetType(MessageType.TEXT);
converter.setTypeIdPropertyName("_type");
return converter;
}
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(JmsSampleApplication.class, args);
JmsTemplate jmsTemplate = context.getBean(JmsTemplate.class);
// Send a message with a POJO - the template reuse the message converter
System.out.println("Sending an email message.");
jmsTemplate.convertAndSend("mailbox.topic", new Email("info@example.com", "Hello"));
jmsTemplate.convertAndSend("mailbox.queue", new Email("info@example.com", "Hello"));
}
}
聽眾
package org.springboot.jms;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;
/**
* Created by RGOVIND on 10/20/2016.
*/
@Component
public class HelloTopicListener {
@JmsListener(destination = "mailbox.topic", containerFactory = "topicListenerFactory")
public void receiveTopicMessage(Email email) {
System.out.println("Received <" + email + ">");
}
@JmsListener(destination = "mailbox.queue", containerFactory = "queueListenerFactory")
public void receiveQueueMessage(Email email) {
System.out.println("Received <" + email + ">");
}
}
完成此操作后,您就可以訂閱所選主題。
當然,有多種方法,您可以為不同的jmsTemplates創建一個bean映射,每個jmsTemplates都可以根據隊列或主題在需要時使用。 模板和bean可以在您選擇喜歡的SO方法中討論的方法中實例化。 希望能幫助到你
標記正確的答案幾乎是正確的。 它仍然無法工作,因為:
factory.setPubSubDomain(true)
必須來之后:
configurer.configure(factory, connectionFactory);
否則,在配置默認值時,pubSubDomain標志設置為true將丟失,並且工廠實例仍將使用隊列而不是主題。
在Spring Boot的Application.properties中,嘗試設置以下屬性:
spring.jms.pub-sub-domain=true
然后,將此屬性用於您用於收聽主題的容器工廠。
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