ActiveMQ常见消息类型

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JMS由下面三部分组成:消息头、属性、消息体。其中消息体定义了五种消息体格式，也可以称为消息类型。

JMS规范中的消息类型包括TextMessage、MapMessage、ObjectMessage、BytesMessage、和StreamMessage等五种。ActiveMQ也有对应的实现，下面我们结合Spring JMS分别来看一下五种消息类型的收发代码。类结构如下图:

下面结合spring研究常见的几种消息类型:

applicationContext.xml如下：

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!--配置扫描注解的包-->
    <context:component-scan base-package="cn.qlq.jms"></context:component-scan>

    <!--Spring为我们提供的ConnectionFactory-->
    <bean id="targetConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="tcp://localhost:61616"></property>
    </bean>

    <!--Spring jms为我们提供的连接池-->
    <bean id="connectionFactory" class="org.springframework.jms.connection.SingleConnectionFactory">
        <property name="targetConnectionFactory" ref="targetConnectionFactory"/>
    </bean>

    <!--一个队列的目的地，构造方法指定queueName，点对点模式-->
    <bean id="queueDestination" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg value="queue"></constructor-arg>
    </bean>

    <!--spring JMS提供的JmsTemplate-->
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
    </bean>


    <!--消费消息容器(需要注入连接工厂，目的地，消息消费者监听器)-->
    <bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="destination" ref="queueDestination"/>
        <property name="messageListener" ref="myConsumer"/>
    </bean>

    <!--一个队列的目的地，构造方法指定queueName，点对点模式-->
    <bean id="topicDestination" class="org.apache.activemq.command.ActiveMQTopic">
        <constructor-arg value="topic"></constructor-arg>
    </bean>
</beans>

1.最常见的 TextMessage

public void sendMessage(final String message) {
        jmsTemplate.send(destination, new MessageCreator() {
            public Message createMessage(Session session) throws JMSException {
                TextMessage textMessage = session.createTextMessage(message);
                return textMessage;
            }
        });
        logger.info("send textMesage:{}",message);
    }

查看后台:

2.MapMessage发送Map消息

public void sendMessage(final String message) {
        jmsTemplate.send(destination, new MessageCreator() {
            public Message createMessage(Session session) throws JMSException {
                MapMessage mapMessage = session.createMapMessage();
                mapMessage.setString("str",message);
                mapMessage.setBoolean("boolean",false);
                return mapMessage;
            }
        });
    }

查看后台消息:

3.ObjectMessage发送序列化对象消息，Object必须实现Serializable接口

public void sendMessage() {
        jmsTemplate.send(destination, new MessageCreator() {
            public Message createMessage(Session session) throws JMSException {
                ObjectMessage objectMessage = session.createObjectMessage();
                ArrayList<String> obj = new ArrayList();
                obj.add("123");
                obj.add("456");
                objectMessage.setObject(obj);
                return objectMessage;
            }
        });
    }

查看后台消息:

4. bytesMessage 发送字节消息

public void sendMessage() {
        jmsTemplate.send(destination, new MessageCreator() {
            public Message createMessage(Session session) throws JMSException {
                BytesMessage bytesMessage = session.createBytesMessage();
                bytesMessage.writeBytes("str".getBytes());
                bytesMessage.writeBoolean(false);
                return bytesMessage;
            }
        });
    }

后台:

5.StreamMessage 发送Stream消息

public void sendMessage() {
        jmsTemplate.send(destination, new MessageCreator() {
            public Message createMessage(Session session) throws JMSException {
                StreamMessage streamMessage = session.createStreamMessage();
                streamMessage.writeString("str");
                streamMessage.writeInt(100);
                streamMessage.writeObject("obj");
                return streamMessage;
            }
        });
    }

消息的接受者:

public void onMessage(Message message) {
        try{
            System.out.println(message.getClass());

            // TextMessage
            if (message instanceof TextMessage) {
                TextMessage textMessage1 = (TextMessage) message;
                System.out.println(textMessage1.getText());
            }

            // MapMessage
            if (message instanceof MapMessage) {
                MapMessage mapMessage = (MapMessage) message;
                System.out.println(mapMessage.toString());
            }

            // ObjectMessage
            if (message instanceof ObjectMessage) {
                ObjectMessage objectMessage = (ObjectMessage) message;
                System.out.println(objectMessage.toString());
            }

            // BytesMessage
            if (message instanceof BytesMessage) {
                byte[] b = new byte[1024];
                int len = -1;
                BytesMessage bm = (BytesMessage) message;
                while ((len = bm.readBytes(b)) != -1) {
                    System.out.println(new String(b, 0, len));
                }
            }

            // StreamMessage
            if (message instanceof StreamMessage) {
                StreamMessage sm = (StreamMessage) message;
                System.out.println(sm.readString());
                System.out.println(sm.readInt());
            }
        }catch (Exception e){

        }
    }

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原文链接：https://www.cnblogs.com/qlqwjy/p/10463296.html

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