（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 ;
             }
         } 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 -;
     }

     @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();
             }
         }
     }
 }