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1、rocket mq版本

      5.1.3

2、pom引入rocket mq依赖

        <dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client-java</artifactId><version>5.0.4</version></dependency>

3、发送MQ消息工具类

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.apis.ClientConfiguration;
import org.apache.rocketmq.client.apis.ClientConfigurationBuilder;
import org.apache.rocketmq.client.apis.ClientException;
import org.apache.rocketmq.client.apis.ClientServiceProvider;
import org.apache.rocketmq.client.apis.message.Message;
import org.apache.rocketmq.client.apis.message.MessageId;
import org.apache.rocketmq.client.apis.producer.Producer;
import org.apache.rocketmq.client.apis.producer.SendReceipt;@Slf4j
public class MqSendUtil {@SneakyThrowspublic static MessageId sendMq(String topic, String tag, String body, String... keys) {// 接入点地址，需要设置成Proxy的地址和端口列表，一般是xxx:8081;xxx:8081。String endpoint = "127.0.0.1:9080";// 消息发送的目标Topic名称，需要提前创建。ClientServiceProvider provider = ClientServiceProvider.loadService();ClientConfigurationBuilder builder = ClientConfiguration.newBuilder().setEndpoints(endpoint);ClientConfiguration configuration = builder.build();// 初始化Producer时需要设置通信配置以及预绑定的Topic。try (Producer producer = provider.newProducerBuilder().setTopics(topic).setClientConfiguration(configuration).build()) {// 普通消息发送。Message message = provider.newMessageBuilder().setTopic(topic)// 设置消息索引键，可根据关键字精确查找某条消息。.setKeys(keys)// 设置消息Tag，用于消费端根据指定Tag过滤消息。.setTag(tag)// 消息体。.setBody(body.getBytes()).build();// 发送消息，需要关注发送结果，并捕获失败等异常。SendReceipt sendReceipt = producer.send(message);log.info("Send message successfully, messageId={}", sendReceipt.getMessageId());return sendReceipt.getMessageId();} catch (ClientException e) {log.error("Failed to send message", e);throw e;}}@SneakyThrowspublic static MessageId sendMqNoTag(String topic, String body, String... keys) {// 接入点地址，需要设置成Proxy的地址和端口列表，一般是xxx:8081;xxx:8081。String endpoint = "127.0.0.1:9080";// 消息发送的目标Topic名称，需要提前创建。ClientServiceProvider provider = ClientServiceProvider.loadService();ClientConfigurationBuilder builder = ClientConfiguration.newBuilder().setEndpoints(endpoint);ClientConfiguration configuration = builder.build();// 初始化Producer时需要设置通信配置以及预绑定的Topic。try (Producer producer = provider.newProducerBuilder().setTopics(topic).setClientConfiguration(configuration).build()) {// 普通消息发送。Message message = provider.newMessageBuilder().setTopic(topic)// 设置消息索引键，可根据关键字精确查找某条消息。.setKeys(keys)// 消息体。.setBody(body.getBytes()).build();// 发送消息，需要关注发送结果，并捕获失败等异常。SendReceipt sendReceipt = producer.send(message);return sendReceipt.getMessageId();} catch (ClientException e) {log.error("Failed to send message", e);throw e;}}}

4、发送MQ消息测试代码

import cn.hutool.core.util.IdUtil;
import org.recipe.draw.common.util.MqSendUtil;public class MqSendTest {public static void test1() {MqSendUtil.sendMq("demo", "tag", "哈哈哈哈tag", IdUtil.getSnowflakeNextIdStr());}public static void main(String[] args) {test1();}
}

5、MessageContext 消息内容的封装

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;import java.util.Collection;
import java.util.Map;@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class MessageContext {private String messageId;private String topic;private String body;private Map<String, String> properties;private Collection<String> keys;private Long deliveryTimestamp;private String bornHost;private Long bornTimestamp;private int deliveryAttempt;}

6、AbstractMqConsumer 发送mq消息的抽象类

import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.apis.ClientConfiguration;
import org.apache.rocketmq.client.apis.ClientServiceProvider;
import org.apache.rocketmq.client.apis.consumer.ConsumeResult;
import org.apache.rocketmq.client.apis.consumer.FilterExpression;
import org.apache.rocketmq.client.apis.consumer.FilterExpressionType;
import org.apache.rocketmq.client.apis.consumer.PushConsumer;
import org.apache.rocketmq.client.apis.message.MessageView;
import org.recipe.draw.common.mqcomsumer.model.MessageContext;
import org.springframework.boot.CommandLineRunner;import java.nio.charset.StandardCharsets;
import java.util.Collections;@Slf4j
public abstract class AbstractMqConsumer implements CommandLineRunner {public abstract String topic();public abstract String consumerGroup();public abstract String tag();public abstract void process(MessageContext messageContext);@Overridepublic void run(String... args) throws Exception {final ClientServiceProvider provider = ClientServiceProvider.loadService();// 接入点地址，需要设置成Proxy的地址和端口列表，一般是xxx:8081;xxx:8081。String endpoints = "127.0.0.1:9080";ClientConfiguration clientConfiguration = ClientConfiguration.newBuilder().setEndpoints(endpoints).build();// 订阅消息的过滤规则，表示订阅所有Tag的消息。String tag = StrUtil.isEmpty(tag()) ? "*" : tag();FilterExpression filterExpression = new FilterExpression(tag, FilterExpressionType.TAG);// 为消费者指定所属的消费者分组，Group需要提前创建。String consumerGroup = consumerGroup();// 指定需要订阅哪个目标Topic，Topic需要提前创建。String topic = topic();// 初始化PushConsumer，需要绑定消费者分组ConsumerGroup、通信参数以及订阅关系。PushConsumer pushConsumer = provider.newPushConsumerBuilder().setClientConfiguration(clientConfiguration)// 设置消费者分组。.setConsumerGroup(consumerGroup)// 设置预绑定的订阅关系。.setSubscriptionExpressions(Collections.singletonMap(topic, filterExpression))// 设置消费监听器。.setMessageListener(messageView -> {// 处理消息并返回消费结果。MessageContext context = toMessageContext(messageView);
//                    log.info("收到mq消息主体内容:{}",context);try {process(context);} catch (Exception e) {log.error("处理mq消息出现异常，消息已自动丢弃，不会再投入队列:", e);}return ConsumeResult.SUCCESS;}).build();log.info("消费者初始化完成,topic:{},tag:{},consumerGroup:{}", topic, tag, consumerGroup);}private MessageContext toMessageContext(MessageView messageView) {Long deliveryTimestamp = messageView.getDeliveryTimestamp().isPresent() ? messageView.getDeliveryTimestamp().get() : null;return MessageContext.builder().messageId(messageView.getMessageId().toString()).topic(messageView.getTopic()).body(StandardCharsets.UTF_8.decode(messageView.getBody()).toString()).properties(messageView.getProperties()).keys(messageView.getKeys()).deliveryTimestamp(deliveryTimestamp).bornHost(messageView.getBornHost()).deliveryAttempt(messageView.getDeliveryAttempt()).build();}}

7、具体的消费类

topic指定消费者订阅的话题，comsumerGroup指明该消费者属于哪一个消费者分组，tag表明是否要获取指定标签的消息，process代表具体的业务处理逻辑，具体消息的内容可以MessageContext 类里面获取

import lombok.extern.slf4j.Slf4j;
import org.recipe.draw.common.mqcomsumer.abstracts.AbstractMqConsumer;
import org.recipe.draw.common.mqcomsumer.model.MessageContext;
import org.springframework.stereotype.Component;@Component
@Slf4j
public class DemoConsumer extends AbstractMqConsumer {@Overridepublic String topic() {return "demo";}@Overridepublic String consumerGroup() {return "demo";}@Overridepublic String tag() {return null;}@Overridepublic void process(MessageContext messageContext) {log.info("收到消息:{}", messageContext);}
}