（三）RocketMq入门之独立线程处理业务

一、示例代码

这段代码实现了一个独立线程监听在一个特殊的消息队列上，一旦收到消息就处理并发送给MQ，然后推送给所有的消费者。

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.client.producer.SendStatus;
import com.alibaba.rocketmq.common.message.Message;
import com.alibaba.rocketmq.remoting.exception.RemotingException;

import java.util.concurrent.LinkedBlockingQueue;


public class ThreadMqProducer implements Runnable {
    public static LinkedBlockingQueue queue = new LinkedBlockingQueue();
    private DefaultMQProducer producer = new DefaultMQProducer("rmq-group");

    public static void main(String[] args) {
        ThreadMqProducer tpd = new ThreadMqProducer();
        tpd.init();

        Thread t1 = new Thread(tpd);
        t1.setName("mq-thread");
        t1.start();
    }

    public void init() {
        producer.setNamesrvAddr("172.18.4.114:9876");
        producer.setInstanceName("producer");

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

    public void release() {
        producer.shutdown();
    }

    public int send2MQ(String body) {
        Message msg = new Message("TopicA-test", "TagA", body.getBytes());
        SendResult sendResult;

        try {
            sendResult = producer.send(msg);

            if (sendResult.getSendStatus() == SendStatus.SEND_OK) {
                return 0;
            }
        } catch (MQClientException e) {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        } catch (RemotingException e) {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        } catch (MQBrokerException e) {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        }

        return -1;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub 
        while (true) {
            try {
                String body = queue.take();
                System.out.println(
                    "take a message from queue... send notify to rocketmq!");
                send2MQ(body);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block 
                e.printStackTrace();
            }
        }
    }
}