我刚刚从https://github.com/spring-guides/gs-messaging-jms/获取了完整的 Spring Boot 示例。
该示例用于发送和接收队列中的消息。要将其更改为主题,您需要在工厂实例中设置 Pub-Sub 属性。
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);
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);
configurer.configure(factory, connectionFactory);
return factory;
}
@Bean
public JmsListenerContainerFactory<?> queueListenerFactory(ConnectionFactory connectionFactory,
DefaultJmsListenerContainerFactoryConfigurer configurer) {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
configurer.configure(factory, connectionFactory);
return factory;
}
@Bean
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);
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"));
}
}
听众
package org.springboot.jms;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;
@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 + ">");
}
}
一旦完成这些步骤,您就可以订阅所需的主题了。
当然,有多种方法可以实现这一点。您可以为不同的jmsTemplates拥有一个bean映射,每个映射都可以根据队列或主题在需要时使用。模板和bean可以在您选择的方法中实例化,例如在此SO问题中讨论的方式。希望它能帮到您。