zcsh0721 commented on issue #2730:
URL: https://github.com/apache/rocketmq/issues/2730#issuecomment-809172234
```
public static void main(String[] args) throws InterruptedException,
MQClientException {
DefaultMQProducer producer = new
DefaultMQProducer("please_rename_unique_group_name");
producer.setNamesrvAddr("127.0.0.1:9876");
producer.start();
for (int i = 0; i < 5; i++) {
try {
Message msg = new Message("TopicTest" /* Topic */,
"TagA" /* Tag */,
("Hello RocketMQ " +
i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
SendResult sendResult = producer.send(msg);
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
Thread.sleep(1000);
}
}
// producer.shutdown();
ConcurrentMap<String, TopicRouteData> table =
producer.getDefaultMQProducerImpl().getmQClientFactory().getTopicRouteTable();
Thread.sleep(10000L);
System.out.println("*************************************************************");
DefaultMQPushConsumer consumer = new
DefaultMQPushConsumer("please_rename_unique_group_name_4");
consumer.setNamesrvAddr("127.0.0.1:9876");
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
consumer.subscribe("TopicTest", "*");
consumer.registerMessageListener(new MessageListenerConcurrently() {
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt>
msgs,
ConsumeConcurrentlyContext context) {
System.out.printf("%s Receive New Messages: %s %n",
Thread.currentThread().getName(), msgs);
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
consumer.start();
System.out.printf("Consumer Started.%n");
}
```
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