最近，在公司的測試環境，遇到個問題，每次重啟應用重啟後，原來消費過的消息又被重復推送了一遍，消費者和生產者代碼如下：

package com.tf56.queue.client;

import java.util.concurrent.TimeUnit;

import com.alibaba.rocketmq.client.exception.MQBrokerException;
import com.alibaba.rocketmq.client.exception.MQClientException;
import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
 
import com.alibaba.rocketmq.client.producer.SendResult;
import com.alibaba.rocketmq.common.message.Message;
import com.alibaba.rocketmq.remoting.exception.RemotingException;
/**
 * RocketMQ 生產者工具類
 * @author zjhua
 *
 */
public class RocketMQProducer {
    
    private DefaultMQProducer producer;
    
 
private String namesrvAddr;
    private String groupName;
    private String instanceName;

    public String getNamesrvAddr() {
        return namesrvAddr;
    }

    public void setNamesrvAddr(String namesrvAddr) {
        this.namesrvAddr = namesrvAddr;
    }

    public String getGroupName() {
        
 
return groupName;
    }

    public void setGroupName(String groupName) {
        this.groupName = groupName;
    }

    public String getInstanceName() {
        return instanceName;
    }

    public void setInstanceName(String instanceName) {
        this.instanceName = instanceName;
    }

    public RocketMQProducer(String namesrvAddr, String groupName,
            String instanceName) {
        super();
        this.namesrvAddr = namesrvAddr;
        this.groupName = groupName;
        this.instanceName = instanceName;
        this.producer = new DefaultMQProducer(groupName);

        producer.setNamesrvAddr(namesrvAddr);
        producer.setInstanceName(instanceName);
        producer.setVipChannelEnabled(false);

        try {
            producer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

    /**
     * 發送消息工具類
     * @param topic
     * @param tags
     * @param keys
     * @param body
     * @return
     * @throws MQClientException
     * @throws RemotingException
     * @throws MQBrokerException
     * @throws InterruptedException
     */
    public SendResult send(String topic, String tags, String keys, byte[] body)
            throws MQClientException, RemotingException, MQBrokerException,
            InterruptedException {
        Message msg = new Message(topic, tags, keys, body);
        try {
            SendResult sendResult = this.producer.send(msg);
            return sendResult;
        } catch (MQClientException | RemotingException | MQBrokerException
                | InterruptedException e) {
            e.printStackTrace();
            throw e;
        }
    }
    
    /**
     * 發送工具類
     * @param topic
     * @param tags
     * @param keys
     * @param body
     * @param retryTimes
     * @param elapseMS
     * @return
     */
    public SendResult send(String topic, String tags, String keys, byte[] body,int retryTimes,int elapseMS) {
        Message msg = new Message(topic, tags, keys, body);
        boolean success = false;
        int i = 0;
        SendResult sendResult = null;
        while (!success && i++ < retryTimes) {
            try {
                sendResult = this.producer.send(msg);
                return sendResult;
            } catch (MQClientException | RemotingException | MQBrokerException
                    | InterruptedException e) {
                e.printStackTrace();
            }
            try {
                Thread.sleep(elapseMS);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return sendResult;
    }

    public static void main(String[] args) throws MQClientException,
            InterruptedException {
        RocketMQProducer producer = new RocketMQProducer("10.7.29.121:9876",
                "ProducerGroupName", "Producer");

        for (int i = 0; i < 10; i++) {
            try {
                {
                    SendResult sendResult = producer.send("TopicTestZJH",// topic
                            "TagA",// tag
                            "OrderID001",// key
                            ("Hello MetaQ" + i).getBytes());
                    System.out.println(sendResult);
                }

                {
                    SendResult sendResult = producer.send("TopicTestYIDU",// topic
                            "TagB",// tag
                            "OrderID0034",// key
                            ("Hello MetaQ" + i).getBytes());
                    System.out.println(sendResult);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            TimeUnit.MILLISECONDS.sleep(1000);
        }
        /**
         * spring bean配置
         */
//        <bean id="rocketMQProducer" class="com.tf56.queue.client.RocketMQProducer">  
//            <constructor-arg name="namesvrAddr" value="10.7.29.121:9876"/>  
//            <constructor-arg name="groupName" value="ProducerGroupName"/>
//            <constructor-arg name="instanceName" value="Producer"/>
//        </bean>
    }
}

消費端代碼：

package tf56.sofa.util;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;

import com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer;
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.client.exception.MQClientException;
import com.alibaba.rocketmq.common.consumer.ConsumeFromWhere;
import com.alibaba.rocketmq.common.message.MessageExt;
import com.alibaba.rocketmq.common.protocol.heartbeat.MessageModel;

public class RocketMQPushConsumer {
    
    private DefaultMQPushConsumer consumer;
    private String namesrvAddr;
    private String groupName;
    private String instanceName;
    private String topics;
    
    public RocketMQPushConsumer(String namesrvAddr, String groupName, String instanceName,String topics,MessageListenerConcurrently messageListener) {
        super();
        this.namesrvAddr = namesrvAddr;
        this.groupName = groupName;
        this.instanceName = instanceName;
        this.topics = topics;
        
        /**
         * 一個應用創建一個Consumer，由應用來維護此對象，可以設置為全局對象或者單例<br>
         * 註意：ConsumerGroupName需要由應用來保證唯一
         */
        consumer = new DefaultMQPushConsumer(groupName);
        consumer.setNamesrvAddr(namesrvAddr);
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        consumer.setInstanceName(RocketMQPushConsumer.getInstanceName(namesrvAddr));
        consumer.setMessageModel(MessageModel.CLUSTERING);
        consumer.setVipChannelEnabled(false);
        try {
            /**
             * 訂閱指定topic下所有消息<br>
             * 註意：一個consumer對象可以訂閱多個topic
             */
            
            String[] topicsArr = topics.split(";");
            for(int i=0;i<topicsArr.length;i++) {
                consumer.subscribe(topicsArr[i], "*");
            }
    
            consumer.registerMessageListener(messageListener);
        } catch (Exception e) {
            e.printStackTrace();
            return;
        }
        System.out.println("Consumer Started.");
    }
    
    /**
     * Consumer對象在使用之前必須要調用start初始化，初始化一次即可<br>
     */
    public void init() {
        try {
            consumer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

    private static String getInstanceName(String namesrvAddr) {
        return getHostAddress() + namesrvAddr;
    }
    
    private static String getHostAddress(){
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 當前例子是PushConsumer用法，使用方式給用戶感覺是消息從RocketMQ服務器推到了應用客戶端。<br>
     * 但是實際PushConsumer內部是使用長輪詢Pull方式從MetaQ服務器拉消息，然後再回調用戶Listener方法<br>
     */
    public static void main(String[] args) throws InterruptedException,
            MQClientException {
        MessageListenerConcurrently messageListener = new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(
                    List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                MessageExt msg = msgs.get(0);
                if (msg.getTopic().equals("TopicTestZJH")) {
                    System.out.println("TopicTestZJH->" + new String(msg.getBody()));
                } else if (msg.getTopic().equals("TopicTestYIDU")) {
                    System.out.println("TopicTestYIDU->" + new String(msg.getBody()));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        };
        RocketMQPushConsumer consumer = new RocketMQPushConsumer("10.7.29.121:9876",
                "ConsumerGroupName", "Consumer","TopicTestZJH;TopicTestYIDU",messageListener);
        consumer.init();
        /**
         * spring構造器註入
         */
//        <bean id="rocketMQPushConsumer" class="com.tf56.queue.client.RocketMQPushConsumer">  
//            <constructor-arg name="namesvrAddr" value="10.7.29.121:9876"/>  
//            <constructor-arg name="groupName" value="ConsumerGroupName"/>
//            <constructor-arg name="instanceName" value="Consumer"/>
//            <constructor-arg name="topics" value="TopicTestZJH;TopicTestYIDU"/>
//            <constructor-arg name="messageListener" ref="messageListener"/>
//        </bean>
    }
}

rocketmq消息重復推送的問題