RocketMQ--（二）HelloWord

package test1;

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;

public class Producer {
    public static void main(String[] args) throws MQClientException {
        DefaultMQProducer producer=new DefaultMQProducer("quickstart_producer");
        producer.setNamesrvAddr("192.168.0.121:9876;192.168.0.122:9876");
        producer.start();
        
        for (int i = 0; i < 100; i++) {
            try {
                Message msg=new Message("TopicQuickStart","TagA",("Hello RocketMQ"+i).getBytes());
                SendResult sendResult=producer.send(msg);
                System.out.println(sendResult);
            } catch (Exception e) {
                // TODO: handle exception
                e.printStackTrace();
            }
        }
        
        producer.shutdown();
    }
}

package test1;

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;

public class Consumer {
    public static void main(String[] args) throws MQClientException {
        DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("quickstart_consumer");
        
        /**
         * 设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费
         * 如果非第一次启动，那么按照上次消费的位置继续消费
         */
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        consumer.setNamesrvAddr("192.168.0.121:9876;192.168.0.122:9876");
        consumer.subscribe("TopicQuickStart","*");
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                    ConsumeConcurrentlyContext context) {
                try {
                    for(MessageExt msg:msgs){
                        String topic=msg.getTopic();
                        String tags=msg.getTags();
                        String msgBody=new String(msg.getBody(),"utf-8");
                        System.out.println(topic+" -- "+tags+" -- "+msgBody);
                    }
                } catch (Exception e) {
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                }
                
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        consumer.start();
        System.out.println("Consumer Started");
    }
}