RocketMQ消息队列实现随机消息发送当做七夕礼物

start mqnamesrv.cmd

start mqbroker.cmd -n 127.0.0.1:9876 autoCreateTopicEnable=true

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 RocketMQOrderProducer {
    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
        producer.setNamesrvAddr("127.0.0.1:9876");
        producer.start();
        String[] tags = new String[]{"TagA", "TagC", "TagD"};
        //读取文件
        List<String> messages = getMessages();
        for (int i = 0; i < messages.size(); i++) {
            String body = messages.get(i);
            Message msg = new Message("topic_luke", tags[i % tags.length], "KEY" + i, body.getBytes());
            SendResult sendResult = producer.send(msg, new MessageQueueSelector() {
                @Override
                public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                    Long id = ((Integer)arg).longValue();
                    long index = id % mqs.size();
                    return mqs.get((int) index);
                }
            }, i);
        }
        producer.shutdown();
    }
    static List<String> getMessages() throws IOException {
        String temp = null;
        File f = new File("E:\Code\online-taxi-three\demo\luke.txt");
        InputStreamReader read = new InputStreamReader(new FileInputStream(f));
        ArrayList readList = new ArrayList();
        BufferedReader reader = new BufferedReader(read);
        while ((temp = reader.readLine()) != null && !"".equals(temp)) {
            readList.add(temp);
        }
        return readList;
    }
}

import lombok.SneakyThrows;
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.message.MessageExt;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class RockerMQConsumer {
    public static void main(String[] args) throws Exception {
        //实例化消息消费者
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group_luke");
        //指定nameserver地址
        consumer.setNamesrvAddr("127.0.0.1:9876");
        consumer.setConsumeThreadMax(1);
        consumer.setConsumeThreadMin(1);
        consumer.setPullBatchSize(1);
        //订阅topic
        consumer.subscribe("topic_luke","*");
        // 注册回调实现类来处理从broker拉取回来的消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @SneakyThrows
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                for (MessageExt msg : msgs) {
                    System.out.println(new String(msg.getBody()));
                    TimeUnit.SECONDS.sleep(3);
                }
                // 标记该消息已经被成功消费
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        // 启动消费者实例
        consumer.start();
        System.out.printf("Consumer Started.%n");
    }
}