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rocketMq实例

ai 2025/5/14 6:30:11

rocketMQ应用：

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dependency

        <dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId><version>4.8.0</version></dependency>

生产者

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;//消息发送者
public class ProducerTest {public static void main(String[] args) {try {// 实例化消息生产者ProducerDefaultMQProducer producer = new DefaultMQProducer("producergroup");// 设置NameServer的地址producer.setNamesrvAddr("127.0.0.1:9876");// 启动Producer实例producer.start();for (int i = 0; i < 10; i++) {//构建消息List<Map<String, String>> list = new ArrayList<Map<String, String>>();Map<String, String> map = new HashMap<String, String>();map.put("F_KEY", "111");list.add(map);Message message = new Message("topic", "*", serialize(list));SendResult sendResult = producer.send(message);System.out.printf("%s%n", sendResult);}// 如果不再发送消息，关闭Producer实例。producer.shutdown();} catch (Exception e) {e.printStackTrace();}}/*** 序列化** @param object* @return*/public static byte[] serialize(Object object) {ObjectOutputStream oos = null;ByteArrayOutputStream baos = null;try {baos = new ByteArrayOutputStream();oos = new ObjectOutputStream(baos);oos.writeObject(object);byte[] bytes = baos.toByteArray();return bytes;} catch (Exception e) {} finally {if (oos != null) {try {oos.close();} catch (Exception ex) {}}if (baos != null) {try {baos.close();} catch (Exception ex) {}}}return null;}
}

消费者

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.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;import java.util.List;//消息接收
public class ConsumerTest {public static void main(String[] args) {try {// 实例化消息生产者ProducerDefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumergroup");// 设置NameServer的地址consumer.setNamesrvAddr("127.0.0.1:9876");//从最开始的位置开始消费consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);// 订阅一个或者多个Topic，以及Tag来过滤需要消费的消息//和发送者保持一致才能搜到消息consumer.subscribe("topic", "*");// 注册回调实现类来处理从broker拉取回来的消息consumer.registerMessageListener(new MessageListenerConcurrently() {@Overridepublic ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,ConsumeConcurrentlyContext context) {System.out.printf("%s 成功搜到消息: %s %n", Thread.currentThread().getName(), msgs);// 标记该消息已经被成功消费return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;}});// 启动Producer实例consumer.start();} catch (Exception e) {e.printStackTrace();}}
}