Spring + ActiveMQ 整合实现发布/订阅（publish-subscribe）消息发送案例

追梦Java 2024-09-05

162

本节演示发布/订阅（publish-subscribe）模式的消息发送的 Spring + ActiveMQ 代码。

1、生产者代码

spring 关键代码：springContext-activemq.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">


  <!-- 创建一个ConnectionFactory,为了提升性能用了连接池 -->
  <bean id="connectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"
    destroy-method="stop">
    <property name="connectionFactory">
      <bean class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
          <value>tcp://localhost:61616</value>
        </property>
      </bean>
    </property>
    <property name="maxConnections" value="50" >
  </bean>


  <!-- 创建消息目的地，constructor-arg是目的地的名称，此处为spring-topic -->
  <bean id="destinationTopic" class="org.apache.activemq.command.ActiveMQTopic">
    <constructor-arg index="0" value="spring-topic" >
  </bean>


  <!-- 构建JmsTemplate -->
  <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
    <property name="connectionFactory" ref="connectionFactory" >
    <property name="defaultDestination" ref="destinationTopic" >
    <property name="messageConverter">
      <bean
        class="org.springframework.jms.support.converter.SimpleMessageConverter" >
    </property>
  </bean>


</beans>

生产者关键代码：SpringTopicSender

package producer;


import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.TextMessage;


import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.core.MessageCreator;


/**
 * 发布/订阅（publish-subscribe）消息发送，spring整合
 * 
 * @author JPM
 */
public class SpringTopicSender {
  public static void main(String[] args) {


    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
        "classpath:spring/springContext-activemq.xml");
    JmsTemplate jmsTemplate = (JmsTemplate) context.getBean("jmsTemplate");
    jmsTemplate.send(new MessageCreator() {


      public Message createMessage(Session session) throws JMSException {
        TextMessage message = session.createTextMessage();
        message.setText("hello,spring-topic!");
        return message;
      }
    });
    context.close();
  }
}

运行 SpringTopicSender 类，查看 ActiveMQ 管理界面

说明已经发布了一个主题消息。

2、消费者代码（receive 方法获取消息）

spring 关键代码：springContext-activemq.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">


  <bean id="connectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"
    destroy-method="stop">
    <property name="connectionFactory">
      <bean class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
          <value>tcp://localhost:61616</value>
        </property>
      </bean>
    </property>
    <property name="maxConnections" value="50" >
  </bean>


  <bean id="destinationTopic" class="org.apache.activemq.command.ActiveMQTopic">
    <constructor-arg index="0" value="spring-topic" >
  </bean>


  <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
    <property name="connectionFactory" ref="connectionFactory" >
    <property name="defaultDestination" ref="destinationTopic" >
    <property name="messageConverter">
      <bean
        class="org.springframework.jms.support.converter.SimpleMessageConverter" >
    </property>
  </bean>


</beans>

消费者关键代码：SpringTopicReceiver1 和 SpringTopicReceiver2

package consumer;


import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jms.core.JmsTemplate;


/**
 * 发布/订阅（publish-subscribe）消息接收1，spring整合
 * 
 * @author JPM
 */
public class SpringTopicReceiver1 {


  public static void main(String[] args) {
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
        "classpath:spring/springContext-activemq.xml");
    JmsTemplate jmsTemplate = (JmsTemplate) context.getBean("jmsTemplate");
    String message = (String) jmsTemplate.receiveAndConvert();
    System.out.println("SpringTopicReceiver1--->" + message);
    context.close();
  }
}

package consumer;


import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jms.core.JmsTemplate;


/**
 * 发布/订阅（publish-subscribe）消息接收2，spring整合
 * 
 * @author JPM
 */
public class SpringTopicReceiver2 {


  public static void main(String[] args) {
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
        "classpath:spring/springContext-activemq.xml");
    JmsTemplate jmsTemplate = (JmsTemplate) context.getBean("jmsTemplate");
    String message = (String) jmsTemplate.receiveAndConvert();
    System.out.println("SpringTopicReceiver2--->" + message);
    context.close();
  }
}

运行 SpringTopicReceiver1 和 SpringTopicReceiver2 类，查看控制台和 ActiveMQ 管理界面

说明2个消费者已经启动，但是看控制台输出都是空的，说明没有消费到消息，原因是对于 topic 消息来说，消费者必须先启动，订阅了主题，然后才能收到主题发来的消息。我们刚才是先发送的主题消息，后启动的消费者，因此2个消费者都没有输出。

下面我们再通过刚才的生产者 SpringTopicSender 类发送一个主题消息，观察消费者的控制台和 ActiveMQ 管理界面的变化

说明，2个消费者都获取到了主题消息。

3、消费者代码（使用消息监听器获取消息）

spring 关键代码 springContext-activemq1.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">


  <bean id="connectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"
    destroy-method="stop">
    <property name="connectionFactory">
      <bean class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
          <value>tcp://localhost:61616</value>
        </property>
      </bean>
    </property>
    <property name="maxConnections" value="50" >
  </bean>


  <bean id="destinationTopic" class="org.apache.activemq.command.ActiveMQTopic">
    <constructor-arg index="0" value="spring-topic" >
  </bean>


  <bean id="jmsContainer1"
    class="org.springframework.jms.listener.DefaultMessageListenerContainer">
    <property name="connectionFactory" ref="connectionFactory" >
    <property name="destination" ref="destinationTopic" >
    <property name="messageListener" ref="messageListener1" >
  </bean>


  <bean id="messageListener1" class="consumer.SpringTopicListener1" >


</beans>

springContext-activemq2.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">


  <bean id="connectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"
    destroy-method="stop">
    <property name="connectionFactory">
      <bean class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
          <value>tcp://localhost:61616</value>
        </property>
      </bean>
    </property>
    <property name="maxConnections" value="50" >
  </bean>


  <bean id="destinationTopic" class="org.apache.activemq.command.ActiveMQTopic">
    <constructor-arg index="0" value="spring-topic" />
  </bean>


  <bean id="jmsContainer2"
    class="org.springframework.jms.listener.DefaultMessageListenerContainer">
    <property name="connectionFactory" ref="connectionFactory" />
    <property name="destination" ref="destinationTopic" />
    <property name="messageListener" ref="messageListener2" />
  </bean>


  <bean id="messageListener2" class="consumer.SpringTopicListener2" />


</beans>

消费者关键代码 SpringTopicListener1

package consumer;


import java.io.IOException;


import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;


import org.springframework.context.support.ClassPathXmlApplicationContext;


/**
 * 发布/订阅（publish-subscribe）消息接收1，spring整合，使用Listener
 * 
 * @author JPM
 */
public class SpringTopicListener1 implements MessageListener {


  public void onMessage(Message message) {
    String msg = null;
    try {
      msg = ((TextMessage) message).getText();
    } catch (JMSException e) {
      e.printStackTrace();
    }
    System.out.println("SpringTopicListener1--->" + msg);
  }


  public static void main(String[] args) {
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
        "classpath:spring/springContext-activemq1  .xml");
    try {
      System.in.read();
    } catch (IOException e) {
      e.printStackTrace();
    }
    context.close();
  }


}

SpringTopicListener2

package consumer;


import java.io.IOException;


import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;


import org.springframework.context.support.ClassPathXmlApplicationContext;


/**
 * 发布/订阅（publish-subscribe）消息接收2，spring整合，使用Listener
 * 
 * @author JPM
 */
public class SpringTopicListener2 implements MessageListener {


  public void onMessage(Message message) {
    String msg = null;
    try {
      msg = ((TextMessage) message).getText();
    } catch (JMSException e) {
      e.printStackTrace();
    }
    System.out.println("SpringTopicListener2--->" + msg);
  }


  public static void main(String[] args) {
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
        "classpath:spring/springContext-activemq2.xml");
    try {
      System.in.read();
    } catch (IOException e) {
      e.printStackTrace();
    }
    context.close();
  }


}