RocketMQ Client 3.6.2.final framework Frequently Asked Questions (Frequently Asked Questions About Rocketmq Client 3.6.2.final Framework)

RocketMQ Client 3.6.2.final Frequency Frequently Asked Questions Answers The following is a common question of common questions about RocketMQ Client 3.6.2.final framework: Question 1: How to create a product sending message? To create a product message, first of all, you need to create a DEFAULTMQPRODUCER object, and set attributes such as the Producer group name, the nameServer address, and message delivery time.Then call the Start method to start the Producer.Next, you can send messages to the specified Topic by send method. The following is an example code: import org.apache.rocketmq.client.producer.DefaultMQProducer; import org.apache.rocketmq.common.message.Message; import org.apache.rocketmq.common.producer.SendResult; public class ProducerExample { public static void main(String[] args) throws Exception { // Instinct a product object DefaultMQProducer producer = new DefaultMQProducer("producer_group"); // Set the nameServer address producer.setNamesrvAddr("127.0.0.1:9876"); // Start the Produceer instance producer.start(); // Create messages Message message = new Message("topic", "tag", "Hello RocketMQ".getBytes()); // Send messages and receive the results of sending results SendResult result = producer.send(message); // Output sending results System.out.println ("Send results:" + Result.Getsendstatus ()); // Close the Producer instance producer.shutdown(); } } Question 2: How to create a consumer consumer message? To create a consumer consumption message, you first need to create a DefaultMQPushConsume object, and set attributes such as the Consumer group name, NameServer address, and message consumption mode.Next, register a message monitor and implement the Consumemessage method processing message.Finally, call the start method to start the consumer. The following is an example code: import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer; import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext; import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently; import org.apache.rocketmq.common.message.MessageExt; public class ConsumerExample { public static void main(String[] args) throws Exception { // Example a Consumer object DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumer_group"); // Set the nameServer address consumer.setNamesrvAddr("127.0.0.1:9876"); // Set the message consumption mode as the cluster mode (the default cluster mode) consumer.setMessageModel(MessageModel.CLUSTERING); // Register message monitor consumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> { for (MessageExt message : msgs) { // Treat the message System.out.println ("Receive messages:" + new string (message.getBody ())); } return ConsumeConcurrentlyStatus.CONSUME_SUCCESS; }); // Start Consumer instance consumer.start(); // Waiting program exit Thread.sleep(60000); // Close the consumer instance consumer.shutdown(); } } The above is an answer to the common questions about RocketMQ Client 3.6.2.final framework and Java code example.If necessary, adjust and expand according to specific needs.