1）集群信息
如下四图，展示了集群的主要信息（为方便起见，只有一个broker，且系单副本）：
图片.png
图片.png
图片.png
图片.png
2）同步的生产者
消费者代码：
import java.util.List;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;
public class Consumer {
public static void main(String[] args) throws Exception {
/*
* Instantiate with specified consumer group name.
*/
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("fuck");
/*
* Specify name server addresses.
*
*
* Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
*
* {@code
* consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
* }
*
*/
consumer.setNamesrvAddr("hadoop102:9876");
/*
* Specify where to start in case the specified consumer group is a brand new one.
*/
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
/*
* Subscribe one more more topics to consume.
*/
consumer.subscribe("TopicTest", "*");
/*
* Register callback to execute on arrival of messages fetched from brokers.
*/
consumer.registerMessageListener(new MessageListenerConcurrently() {
public ConsumeConcurrentlyStatus consumeMessage(List msgs,
ConsumeConcurrentlyContext context) {
System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
/*
* Launch the consumer instance.
*/
consumer.start();
System.out.printf("Consumer Started.%n");
}
}
生产者代码：
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;
public class Producer {
public static void main(String[] args) throws InterruptedException, MQClientException {
/*
* Instantiate with a producer group name.
*/
DefaultMQProducer producer = new DefaultMQProducer("fuck");
/*
* Specify name server addresses.
*
*
* Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
*
* {@code
* producer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
* }
*
*/
producer.setNamesrvAddr("hadoop102:9876");
/*
* Launch the instance.
*/
producer.start();
for (int i = 0; i < 2; i++) {
try {
/*
* Create a message instance, specifying topic, tag and message body.
*/
Message msg = new Message("TopicTest" /* Topic */,
// tag 可以对消息进行快速过滤
"TagA" /* Tag */,
("Hello World " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
/*
* Call send message to deliver message to one of brokers.
*/
SendResult sendResult = producer.send(msg);
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
// Thread.sleep(1000);
}
}
/*
* Shut down once the producer instance is not longer in use.
*/
producer.shutdown();
}
}
消费者运行结果（先运行生产者，再运行消费者，可见生产者发送的2条消息，均被消费者正确接收）：
图片.png
生产者运行结果（可见生产者发了2条消息）：
图片.png
3）异步的生产者
生产者成功发送100条消息，随后成功收到100异步个（从消费者）返回的成功信息：
image.png
消费者成功消费到100条消息：
image.png
异步生产者的代码如下（消费者代码与上例一样）：
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;
import java.io.UnsupportedEncodingException;
import java.rmi.Remote;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public class AsyncProducer {
public static void main(
String[] args) throws MQClientException, InterruptedException, UnsupportedEncodingException {
DefaultMQProducer producer = new DefaultMQProducer("Jodie_Daily_test");
producer.setNamesrvAddr("hadoop102:9876");
producer.start();
producer.setRetryTimesWhenSendAsyncFailed(0);
int messageCount = 100;
//
final CountDownLatch countDownLatch = new CountDownLatch(messageCount);
for (int i = 0; i < messageCount; i++) {
try {
final int index = i;
Message msg = new Message("TopicTest",
"TagA",
"OrderID188",
"Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
producer.send(msg, new SendCallback() {
public void onSuccess(SendResult sendResult) {
countDownLatch.countDown();
System.out.printf("%-10d OK %s %n", index, sendResult.getMsgId());
}
public void onException(Throwable e) {
countDownLatch.countDown();
System.out.printf("%-10d Exception %s %n", index, e);
e.printStackTrace();
}
});
System.out.println("异步消息发送完成~~下标:" + i);
} catch (Exception e) {
e.printStackTrace();
}
}
countDownLatch.await(5, TimeUnit.SECONDS);
producer.shutdown();
}
}
=====================
参考链接：
https://gitee.com/josekongng/rocketmq-demo