VIPJAVA/rocketmq-demo/src/main/java/com/sf/order/OrderProducer.java

package com.sf.order;

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.MessageQueueSelector;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageQueue;

import java.util.List;

public class OrderProducer {

    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("pg");
        producer.setNamesrvAddr("localhost:9876");
        producer.start();
        for (int i = 0 ; i < 100 ; i++) {
            Integer orderId = i;
            byte[] body = ("Hi," + i).getBytes();
            Message msg = new Message("TopicC", "TagC", body);
            SendResult sendResult = producer.send(msg, new MessageQueueSelector() {
                @Override
                public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                        Integer id = (Integer) arg;
                        int index = id % mqs.size();
                        return mqs.get(index);
                    }
                }, orderId);
            System.out.println(sendResult);
        }
        producer.shutdown();
    }
}