前言

RocketMQ是阿里巴巴在2012年开源的分布式消息中间件，目前已经捐赠给Apache基金会，已经于2016年11月成为 Apache 孵化项目，相信RocketMQ的未来会发挥着越来越大的作用，将有更多的开发者因此受益。
本文仅对RocketMQ的简单实用做入门性介绍，不对RocketMQ的底层原理进行深入介绍，后续文章将对RocketMQ的原理做详细介绍。

1、RocketMQ的Maven依赖，pom.xml中引入jar包：

<!-- RocketMQ --> 
<dependency>
    <groupId>com.alibaba.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>3.5.8</version>
</dependency>
<dependency>
   <groupId>com.alibaba.rocketmq</groupId>
   <artifactId>rocketmq-all</artifactId>
   <version>3.5.8</version>
   <type>pom</type>
  </dependency>

2、Spring bean 配置单例

<!-- 监听实现 -->
<bean id="rocketMqListener" class="com.rocketMq.service.impl.RocketMqListenerImpl"></bean>
<!-- 监听配置 -->
<bean id="consumer" class="com.rocketMq.utils.Consumer" init-method="init">
    <property name="consumerGroup" value="PushConsumer"/>
    <property name="namesrvAddr" value="192.168.0.1:19876"/>
    <property name="topic" value="node_topic"/>
    <property name="subExpression" value="slu"/>
    <property name="rocketMqListener" ref="rocketMqListener"/>
</bean>  

3、Java源码

1）、RocketMqListener.java

package com.rocketMq.dao;
import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import com.alibaba.rocketmq.common.message.MessageExt;
 /**
* 消费者监听接口，业务需要实现此接口并配置到Consumer中
* Created by 麦克劳林
*/
public interface RocketMqListener {
boolean RocketMqMessage(MessageExt ext,ConsumeConcurrentlyContext Context);
}

2)、

package com.rocketMq.dao;
import java.util.List;
import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import com.alibaba.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import com.alibaba.rocketmq.common.message.MessageExt;
/**
 * 监听wrapper，用于处理共通业务，并转发消息到业务监听中。
 * Created by 麦克劳林
 */
public class RocketMqWrapper implements MessageListenerConcurrently{
private RocketMqListener rocketMqListener;
public RocketMqListener getRocketMqMessageListener() {
    return rocketMqListener;
}
public void setRocketMqListener(RocketMqListener rocketMqListener) {
    this.rocketMqListener = rocketMqListener;
}
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> messagesList,ConsumeConcurrentlyContext consumeConcurrentlyContext) {  
        if(ext.getTags().equals("RFID")){
            if(rocketMqListener.RFIDMessage(ext, consumeConcurrentlyContext)){
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            } else{
                return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }   
    }
}

}