spring jms

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1. spring 配置

<bean id="jmsConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"          destroy-method="stop">        <property name="connectionFactory">            <bean class="org.apache.activemq.ActiveMQConnectionFactory">                <property name="brokerURL" value="failover:(tcp://localhost:61616)" />                <property name="useAsyncSend" value="true" />                <property name="redeliveryPolicy" ref="redeliveryPolicy" />                <property name="prefetchPolicy" ref="prefetchPolicy" />            </bean>        </property>        <property name="maxConnections" value="100" />    </bean>    <!--  Spring JmsTemplate config -->    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">        <!--  lets wrap in a pool to avoid creating a connection per send -->        <property name="connectionFactory" ref="jmsConnectionFactory" />        <property name="sessionTransacted" value="true" />        <property name="defaultDestination" ref="bookGift"/>        <property name="deliveryMode" value="2"/>    </bean>    <bean id="bookGift" class="org.apache.activemq.command.ActiveMQQueue">        <constructor-arg index="0" value="bookGift" />    </bean>    <!-- 配置消息队列监听者（Queue），自己写的实现 onMessage方法 -->    <bean id="queueMessageListener" class="cn.valenon.test.jms.JmsListener" />    <!-- 消息监听容器（Queue） -->    <bean id="jmsContainer"          class="org.springframework.jms.listener.DefaultMessageListenerContainer">        <property name="connectionFactory" ref="jmsConnectionFactory" />        <property name="destination" ref="bookGift" />        <property name="messageListener" ref="queueMessageListener" />    </bean>

2. 发送消息的服务:接口和实现类

interface MessageProducerService {    /**     * 向指定队列发送消息     */    public void sendMessage(Destination destination, final String msg)/** * 向默认队列发送消息 */    public void sendMessageOnDefault(final BookMessage msg)}

class MessageProducerServiceImpl implements MessageProducerService {    @Autowired    private JmsTemplate jmsTemplate    /**     * 向指定队列发送消息     */    @Override    public void sendMessage(Destination destination, String msg) {        jmsTemplate.convertAndSend(destination,msg)    }/** * 向默认队列发送消息 */    @Override    public void sendMessageOnDefault(final BookMessage msg) {        Destination destination =  jmsTemplate.getDefaultDestination();        jmsTemplate.convertAndSend(destination,msg)    }}

BookMessage是一个自定义的POJO，作为消息体，需要实现Serilizable接口

class BookMessage implements Serializable {    String name;    int age;    public String toString(){        return this.name + ";" + this.age    }}

3. 消息监听类：

class JmsListener implements MessageListener {    @Override    void onMessage(Message message) {        try {            ObjectMessage tm = (ObjectMessage) message;            BookMessage bm = tm.getObject();        } catch (JMSException e) {            e.printStackTrace();        }    }}

也可以直接发送String，这时，就需要将Message转换成TextMessage，而不是ObjectMessage。

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