（二）RocketMq入门之消息发送和接收

一、消息产生、发送

public class Producer {
public static void main(String[] args) throws MQClientException {
　　DefaultMQProducer producer = new DefaultMQProducer("rmq-group");
　　producer.setNamesrvAddr("172.18.4.114:9876");
　　producer.setInstanceName("producer");
　　producer.start();
　　try {
　　　　for (int i = 0; i < 10; i++) {
　　　　Thread.sleep(5000); //每5秒发送一次MQ
　　　　Message msg = new Message("TopicA-test",// topic
　　　　　　"TagA",// tag
　　　　　　(new Date() + " Hello RocketMQ ,QuickStart" + i)
　　　　　　.getBytes()// body
　　　　　　);
　　　　SendResult sendResult = producer.send(msg);
　　　　}
　　} catch (Exception e) {
　　　　e.printStackTrace();
　　}
　　producer.shutdown();
　　}
}

二、消息接收、消费

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.message.MessageExt;

import java.util.List;


public class Consumer {
    public static void main(String[] args) throws MQClientException {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("rmq-group");

        consumer.setNamesrvAddr("172.18.4.114:9876");
        consumer.setInstanceName("consumer");
        consumer.subscribe("TopicA-test", "TagA");

        consumer.registerMessageListener(new MessageListenerConcurrently() {
                @Override
                public ConsumeConcurrentlyStatus consumeMessage(
                    List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                    for (MessageExt msg : msgs) {
                        System.out.println(new String(msg.getTopic()));
                        System.out.println(new String(msg.getTags()));
                        System.out.println("=== " + new String(msg.getBody()));
                    }

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