背景：传入一个List<person>,不知道list中有多少条数据。

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.Message;
import org.apache.rocketmq.client.producer.SendResult;import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class MultiThreadMessageSender {public static void main(String[] args) {// 设置生产者组名DefaultMQProducer producer = new DefaultMQProducer("your_producer_group");// 设置NameServer地址，多个地址用分号分隔producer.setNamesrvAddr("your_namesrv_address");// 启动生产者实例try {producer.start();// 创建消息集合List<Person> personList = // 从某处获取您的 Person 数据// 创建线程池ExecutorService executorService = Executors.newFixedThreadPool(5); // 这里使用固定大小为5的线程池，您可以根据需要进行调整// 每10条数据为一批，提交到线程池处理for (int i = 0; i < personList.size(); i += 10) {List<Person> subList = personList.subList(i, Math.min(i + 10, personList.size()));// 提交任务到线程池executorService.submit(() -> sendMessages(subList, producer));}// 关闭线程池executorService.shutdown();} catch (Exception e) {e.printStackTrace();} finally {// 关闭生产者实例producer.shutdown();}}private static void sendMessages(List<Person> subList, DefaultMQProducer producer) {try {// 创建消息集合List<Message> messages = new ArrayList<>();// 构造消息for (Person person : subList) {// 将 Person 对象转换为字符串，作为消息内容String messageContent = person.getName() + "," + person.getAge();Message message = new Message("your_topic", "your_tag", messageContent.getBytes());messages.add(message);}// 发送消息SendResult sendResult = producer.send(messages);System.out.println("Thread " + Thread.currentThread().getId() + " Send Result: " + sendResult);} catch (Exception e) {e.printStackTrace();}}
}

在上述示例中，我们使用了Java的ExecutorService线程池来管理线程。每个线程负责处理10条Person对象，将它们转换为RocketMQ消息并发送。这样，多个线程可以并行处理不同的批次，提高了消息发送的效率。