RocketMQ简单入门

以下是rocketMQ的简单小demo：

Producer：

package com.olayc.edi.rocketmq;

import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
import com.alibaba.rocketmq.client.producer.SendResult;
import com.alibaba.rocketmq.common.message.Message;


/**
 * @description: 生产者模型
 * @author: Mr.Wang
 * @create: 2019-05-05 15:39
 **/
public class Producer {
    public static void main(String[] args) throws Exception {
        // new一个rocketMQ中producer默认的名字 -> group
        DefaultMQProducer producer = new DefaultMQProducer("group");
        // 给一个namesrv的地址
        producer.setNamesrvAddr("192.168.56.200:9876");
        // 启动producer  和远程的namesrv进行连接
        producer.start();
        // 写数据
        for (int i = 0; i < 100; i++) {
            // topic(主题的名字) -> orders  所有属于一个topic的消息都放在一起  相当于对消息进行分类
            //  ("order" + i).getBytes() -> 消息体   (字节数组)
            Message msg = new Message("orders", ("order" + i).getBytes());
            SendResult result = producer.send(msg);
            System.out.println(result);
            System.out.println(msg + "send out");
            Thread.sleep(500L);
        }
        producer.shutdown();

    }

}

PushConsumer：

package com.olayc.edi.rocketmq;

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 java.util.List;

/**
 * @description: 监听器模式的consumer -- 观察者模式
 * @author: Mr.Wang
 * @create: 2019-05-05 16:02
 **/
public class PushConsumer {
    public static void main(String[] args) {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumers");
        consumer.setNamesrvAddr("192.168.56.200:9876");

        try {
            // 订阅消息  topic -> orders   第二个参数是tag 没有设置为null
            consumer.subscribe("orders", null);
            // 程序第一次启动从消息队列头取数据
            consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
            consumer.registerMessageListener(new MessageListenerConcurrently() {
                @Override
                public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                    MessageExt msg = list.get(0);
                    System.out.println(new String(msg.getBody()));
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                }
            });
            consumer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

}