public class MQProducer {
    public static void main(String[] args) throws MQClientException {
        //創(chuàng)建生產(chǎn)者
        DefaultMQProducer producer=new DefaultMQProducer("rmq-group");
        //設(shè)置NameServer地址
        producer.setNamesrvAddr("192.168.138.187:9876;192.168.138.188:9876");
        //設(shè)置生產(chǎn)者實(shí)例名稱(chēng)
        producer.setInstanceName("producer");
        //啟動(dòng)生產(chǎn)者
        producer.start();
        try {
            //發(fā)送消息
            for (int i=0;i<1;i++){
                Thread.sleep(1000); //每秒發(fā)送一次
                //創(chuàng)建消息
                Message msg = new Message("wn04", // topic 主題名稱(chēng)
                        "TagA", // tag 臨時(shí)值
                        ("w-"+i).getBytes()// body 內(nèi)容
                );
                //消息的唯一標(biāo)識(shí)
                msg.setKeys(System.currentTimeMillis() + "");
                //發(fā)送消息
                SendResult sendResult=producer.send(msg);
                System.out.println(sendResult.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        producer.shutdown();
    }

}

public class MQConsumer {

    //保存標(biāo)識(shí)的集合
    static private Map<String, String> logMap = new HashMap<>();

    public static void main(String[] args) throws MQClientException {
        //創(chuàng)建消費(fèi)者
        DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("rmq-group");
        //設(shè)置NameServer地址
        consumer.setNamesrvAddr("192.168.138.187:9876;192.168.138.188:9876");
        //設(shè)置消費(fèi)者實(shí)例名稱(chēng)
        consumer.setInstanceName("consumer");
        //訂閱topic
        consumer.subscribe("wn04","TagA");
        //監(jiān)聽(tīng)消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                String key = null;
                String msgId = null;
                try {
                    for (MessageExt msg : list) {
                        key = msg.getKeys();
                        //判斷集合當(dāng)中有沒(méi)有存在key,存在就不需要重試,不存在先存key再回來(lái)重試后消費(fèi)消息
                        if (logMap.containsKey(key)) {
                            // 無(wú)需繼續(xù)重試。
                            System.out.println("key:"+key+",無(wú)需重試...");
                            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                        }
                        msgId = msg.getMsgId();
                        System.out.println("key:" + key + ",msgid:" + msgId + "---" + new String(msg.getBody()));
                        //模擬異常
                        int i = 1 / 0;
                    }
                } catch (Exception e) {
                    //e.printStackTrace();
                    //重試
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                } finally {
                    //保存key
                    logMap.put(key, msgId);
                }

                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        consumer.start();
        System.out.println("Consumer Started...");

    }
}