我正在学习 ActiveMQ,到目前为止,我已经制作了一个简单的 Spring Boot 生产者+消费者应用程序(出于本问题的目的,将其称为 App1),它与 ActiveMQ 的本地实例进行通信,并且一切都按预期进行。
现在我正在尝试运行另一个 Spring Boot 应用程序(在同一台计算机上,但在确保 App1 未运行之后),该应用程序只有一个消费者(没有生产者),但是当我启动此应用程序时应用程序中,队列中的消息(我使用修改后的 App1 放置的,其中删除了应用程序的使用者部分)不会被拾取。在App1中,消息一发布,消费者就会打印出system.out打印语句,但在这个仅限消费者的应用程序中并非如此。下面是我的监听器组件类:
package com.demo.listener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;
@Component
public class Consumer {
@JmsListener(destination = "testqueue")
public void consume(String message) {
System.out.println("Picked up message: " + message);
}
}
为了实现所需的行为,我需要进行哪些更改?
App1 application.properties
文件:
spring.activemq.in-memory=false
spring.activemq.pool.enabled=false
server.port=9000
activemq.broker-url=tcp://localhost:61616
spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration, org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration
security.basic.enabled=false
management.security.enabled=false
App1 JmsConfig 类
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jms.core.JmsTemplate;
@Configuration
public class JmsConfig {
@Value("${activemq.broker-url}")
private String brokerUrl;
@Bean
public Queue queue() {
return new ActiveMQQueue("testqueue");
}
@Bean
public ActiveMQConnectionFactory activeMQConnectionFactory() {
ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory();
factory.setBrokerURL(brokerUrl);
return factory;
}
@Bean
public JmsTemplate jmsTemplate() {
return new JmsTemplate(activeMQConnectionFactory());
}
}
App1 生产者类
import javax.jms.Queue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/rest/publish")
public class ProducerResource {
@Autowired
JmsTemplate jmsTemplate;
@Autowired
Queue queue;
@GetMapping("/{message}")
public String publishMessage(@PathVariable("message") final String message) {
jmsTemplate.convertAndSend(queue, message);
return "Published successfully";
}
}
App1 消费者类与我在仅限消费者的应用程序(上面列出)中使用的类相同。
最佳答案
对于您的消费者应用程序,您确实需要为您的消费者 JMS 模板添加池连接工厂和 JMS 消息监听器工厂才能开始接收消息。
@Configuration
@EnableJms
public class ConsumerConfig {
@Value("${activemqbrokerurl}")
private String brokerUrl;
@Bean
public ActiveMQConnectionFactory activeMQConnectionFactory() {
ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory();
activeMQConnectionFactory.setBrokerURL(brokerUrl);
return activeMQConnectionFactory;
}
@Bean
public DefaultJmsListenerContainerFactory jmsListenerContainerFactory() {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
factory.setConnectionFactory(activeMQConnectionFactory());
factory.setConcurrency("{#setDesiredConcurrency}");
return factory;
}
}
Spring's MessagListenerContainer should be used for message consumption. This provides all the power of MDBs - efficient JMS consumption and pooling of the message listeners - but without requiring a full EJB container.
You can use the activemq-pool org.apache.activemq.pool.PooledConnectionFactory for efficient pooling of the connections and sessions for your collection of consumers, or you can use the Spring JMS org.springframework.jms.connection.CachingConnectionFactory to achieve the same effect.
您可以阅读更多相关信息here
关于java - 如何为 ActiveMQ 队列创建 Spring Boot 消费者?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51331135/