（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。
 1 import com.alibaba.rocketmq.client.exception.MQBrokerException;
 2 import com.alibaba.rocketmq.client.exception.MQClientException;
 3 import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
 4 import com.alibaba.rocketmq.client.producer.SendResult;
 5 import com.alibaba.rocketmq.client.producer.SendStatus;
 6 import com.alibaba.rocketmq.common.message.Message;
 7 import com.alibaba.rocketmq.remoting.exception.RemotingException;
 8 
 9 import java.util.concurrent.LinkedBlockingQueue;
10 
11 
12 public class ThreadMqProducer implements Runnable {
13     public static LinkedBlockingQueue queue = new LinkedBlockingQueue();
14     private DefaultMQProducer producer = new DefaultMQProducer("rmq-group");
15 
16     public static void main(String[] args) {
17         ThreadMqProducer tpd = new ThreadMqProducer();
18         tpd.init();
19 
20         Thread t1 = new Thread(tpd);
21         t1.setName("mq-thread");
22         t1.start();
23     }
24 
25     public void init() {
26         producer.setNamesrvAddr("172.18.4.114:9876");
27         producer.setInstanceName("producer");
28 
29         try {
30             producer.start();
31         } catch (MQClientException e) {
32             e.printStackTrace();
33         }
34     }
35 
36     public void release() {
37         producer.shutdown();
38     }
39 
40     public int send2MQ(String body) {
41         Message msg = new Message("TopicA-test", "TagA", body.getBytes());
42         SendResult sendResult;
43 
44         try {
45             sendResult = producer.send(msg);
46 
47             if (sendResult.getSendStatus() == SendStatus.SEND_OK) {
48                 return 0;
49             }
50         } catch (MQClientException e) {
51             // TODO Auto-generated catch block 
52             e.printStackTrace();
53         } catch (RemotingException e) {
54             // TODO Auto-generated catch block 
55             e.printStackTrace();
56         } catch (MQBrokerException e) {
57             // TODO Auto-generated catch block 
58             e.printStackTrace();
59         } catch (InterruptedException e) {
60             // TODO Auto-generated catch block 
61             e.printStackTrace();
62         }
63 
64         return -1;
65     }
66 
67     @Override
68     public void run() {
69         // TODO Auto-generated method stub 
70         while (true) {
71             try {
72                 String body = queue.take();
73                 System.out.println(
74                     "take a message from queue... send notify to rocketmq!");
75                 send2MQ(body);
76             } catch (InterruptedException e) {
77                 // TODO Auto-generated catch block 
78                 e.printStackTrace();
79             }
80         }
81     }
82 }