Spring+JMS实现消息的发送与接收

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创建maven项目，导入依赖
1. <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <spring-version>4.2.2.RELEASE</spring-version>
  </properties>
  
  <dependencies>
  <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>${spring-version}</version>
  </dependency>
  <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jms</artifactId>
  <version>${spring-version}</version>
  </dependency>
  <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>${spring-version}</version>
  </dependency>
  
  <dependency>
  <groupId>org.apache.activemq</groupId>
  <artifactId>activemq-all</artifactId>
  <version>5.14.3</version>
  </dependency>
  <dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-pool2</artifactId>
  <version>2.4.2</version>
  </dependency>
  
  </dependencies>
配置文件applicationContext.xml
1. <?xml version="1.0" encoding="UTF-8"?>
  <beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:spring="http://camel.apache.org/schema/spring"
  xmlns:jms="http://www.springframework.org/schema/jms"
  xsi:schemaLocation="http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-4.2.xsd
  http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.2.xsd
  http://camel.apache.org/schema/springhttp://camel.apache.org/schema/spring/camel-spring-2.0-M1.xsd">
  
  <context:component-scan base-package="com.hand.spring_jms"></context:component-scan>
  
  
  <bean id="targetConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
  <property name="brokerURL" value="tcp://localhost:61616"></property>
  </bean>
  
  
  <bean id="pooledConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory">
  <property name="connectionFactory" ref="targetConnectionFactory"></property>
  <property name="maxConnections" value="10"></property>
  </bean>
  
  
  <bean id="connectionFactory" class="org.springframework.jms.connection.SingleConnectionFactory">
  <property name="targetConnectionFactory" ref="pooledConnectionFactory"></property>
  </bean>
  
  
  <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
  <property name="connectionFactory" ref="connectionFactory"></property>
  </bean>
  
  
  <bean id="queueDestination" class="org.apache.activemq.command.ActiveMQQueue">
  <constructor-arg>
  <value>queue</value>
  </constructor-arg>
  </bean>
  
  
  <bean id="consumerMessageListener" class="com.hand.spring_jms.service.ConsumerMessageListener"></bean>
  
  
  <bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
  <property name="connectionFactory" ref="connectionFactory"></property>
  <property name="destination" ref="queueDestination"></property>
  <property name="messageListener" ref="consumerMessageListener"></property>
  </bean>
  
  
  <bean id="topicDestination" class="org.apache.activemq.command.ActiveMQTopic">
  <constructor-arg>
  <value>topic</value>
  </constructor-arg>
  </bean>
  
  </beans>
创建类ProducerService，用于发布消息
1. 在sendMessage方法体里面我们是通过jmsTemplate来发送消息到对应的Destination的。
2. package com.hand.spring_jms.service;
  
  import javax.jms.Destination;
  import javax.jms.JMSException;
  import javax.jms.Message;
  import javax.jms.Session;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.jms.core.JmsTemplate;
  import org.springframework.jms.core.MessageCreator;
  import org.springframework.stereotype.Component;
  
  @Component
  public class ProducerService{
  
  @Autowired
  @Qualifier("jmsTemplate")
  private JmsTemplate jmsTemplate;
  
  public void sendMessage(Destination destination, final String message){
  
  System.out.println("------生产者发送的消息-----");
  System.out.println("生产者发送的一条消息： "+ message);
  
  jmsTemplate.send(destination, new MessageCreator() {
  
  public Message createMessage(Session session) throws JMSException {
  // TODO Auto-generated method stub
  System.out.println("发送成功---");
  return session.createTextMessage(message);
  }
  });
  
  }
  
  public JmsTemplate getJmsTemplate(){
  return jmsTemplate;
  }
  
  public void setJmsTemplate(JmsTemplate jmsTemplate) {
  this.jmsTemplate = jmsTemplate;
  }
  
  }
创建ConsumerMessageListener类，用作消息的接收，这里继承MessageListener，用于监听队列中是否有消息，接收到消息后的进一步处理也可在此方法中实现
1. package com.hand.spring_jms.service;
  
  import javax.jms.JMSException;
  import javax.jms.Message;
  import javax.jms.MessageListener;
  import javax.jms.TextMessage;
  
  public class ConsumerMessageListener implements MessageListener {
  
  public void onMessage(Message message) {
  
  TextMessage msg = (TextMessage)message;
  
  System.out.println("接收到一条纯文本消息");
  
  try {
  System.out.println("消息的内容是: "+ msg.getText());
  
  } catch (JMSException e) {
  e.printStackTrace();
  }
  
  }
  
  }
创建测试类
1. package com.hand.spring_jms.test;
  
  import javax.jms.Destination;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.test.context.ContextConfiguration;
  import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
  
  import com.hand.spring_jms.service.ProducerService;
  
  @RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration("/applicationContext.xml")
  public class ProducerCusumerTest {
  
  @Autowired
  private ProducerService producerService;
  
  @Autowired
  @Qualifier("queueDestination")
  private Destination destination;
  
  @Test
  public void testSend(){
  for (int i = 0; i < 2; i++) {
  producerService.sendMessage(destination, "Hello World!!!");
  
  }
  }
  
  }
实现中的一些注意的细节部分
1. 使用ActiveMQ提供的ActiveMQConnectionFactory，用于产生ConnectionFactory，Spring中的SingleConnectionFactory只是一种spring提供的管理方式，不是真正产生Connection的ConnectionFactory。
2. ActiveMQ为我们提供了一个PooledConnectionFactory，通过往里面注入一个ActiveMQConnectionFactory可以用来将Connection、Session和MessageProducer池化，这样可以大大的减少我们的资源消耗。
3. 在配置一个MessageListenerContainer的时候有三个属性必须指定，一个是表示从哪里监听的ConnectionFactory；一个是表示监听什么的Destination；一个是接收到消息以后进行消息处理的MessageListener。

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