RocketMQ5.0以上的版本给出SimpleConsumer异步订阅消息demo

实现步骤
步骤1：配置与初始化SimpleConsumer
由于直接示例未给出，我们需依据RocketMQ API手册或现有文档构造一个异步消费的逻辑框架。首先，确保您的环境中已安装并配置好Apache RocketMQ客户端。接着，初始化SimpleConsumer实例，配置必要的参数，比如Namesrv地址、消费组名称等。
Properties consumerProps = new Properties();
consumerProps.put(PropertyKeyConst.NAMESRV_ADDR, "");
consumerProps.put(PropertyKeyConst.GROUP_ID, "");
SimpleConsumer consumer = new SimpleConsumer(consumerProps);
步骤2：订阅主题与Tag
接下来，使用SimpleConsumer订阅您感兴趣的特定主题及Tag（如果需要）。
consumer.subscribe("", "*");
步骤3：实现消息处理逻辑
不同于PushConsumer自动推送消息，SimpleConsumer需要您主动调用接收方法来获取消息。因此，您需要实现一个循环或定时任务来不断检查是否有新消息到达，并处理这些消息。
while (true) {
List messageViewList = consumer.receive(10, Duration.ofSeconds(30));
for (MessageView messageView : messageViewList) {
System.out.println("Received message: " + new String(messageView.getBody()));
// 您的业务逻辑处理
// 消费成功后确认
consumer.ack(messageView);
}
}
此回答整理自钉群“群2-Apache RocketMQ 中国开发者钉钉群”

使用阿里云RocketMQ 5.x的Java客户端SimpleConsumer异步消费Topic消息的简单示例：

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.spring.core.RocketMQTemplate;
import org.apache.rocketmq.spring.support.DefaultRocketMQListenerContainer;
import org.apache.rocketmq.spring.support.RocketMQMessageListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SimpleConsumerConfig {

    @Bean
    public DefaultRocketMQListenerContainer simpleConsumer(RocketMQTemplate rocketMQTemplate) {
        DefaultRocketMQListenerContainer container = new DefaultRocketMQListenerContainer();
        container.setRocketMQTemplate(rocketMQTemplate);
        container.setConsumerGroup("Your ConsumerGroup");
        container.setTopics("Your Topic");
        container.setMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageView> msgs, ConsumeConcurrentlyContext context) {
                // 消费消息的逻辑
                for (MessageView msg : msgs) {
                    System.out.println("Received message: " + msg);
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        container.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);
        return container;
    }
}

确保替换Your ConsumerGroup和Your Topic为实际的消费者组和主题名。此代码片段展示了如何设置一个简单的异步消息监听器，消息会并发地被处理。更多信息可参考阿里云RocketMQ文档。