RocketMQ发送各种消息（同步，异步，单项，延迟，批量，顺序，事务，带标签，带key）

以下是使用RocketMQ发送不同类型消息的示例代码。

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
 
public class Producer {
    public static void main(String[] args) throws Exception {
        // 1. 创建生产者
        DefaultMQProducer producer = new DefaultMQProducer("producer_group");
        // 2. 指定Namesrv地址
        producer.setNamesrvAddr("localhost:9876");
        // 3. 启动生产者
        producer.start();
 
        try {
            // 4. 发送同步消息
            Message msg = new Message("TopicTest", "TagA", "OrderID001", "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
            SendResult sendResult = producer.send(msg);
            System.out.printf("%s%n", sendResult);
 
            // 5. 发送异步消息
            producer.send(msg, new SendCallback() {
                @Override
                public void onSuccess(SendResult sendResult) {
                    System..out.printf("%s%n", sendResult);
                }
 
                @Override
                public void onException(Throwable e) {
                    e.printStackTrace();
                }
            });
 
            // 6. 发送单向消息
            producer.sendOneway(msg);
 
            // 7. 发送延时消息
            Message delayMsg = new Message("TopicTest", "TagA", "OrderID002", "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
            delayMsg.setDelayTimeLevel(3); // 设置延时级别
            producer.send(delayMsg);
 
            // 8. 发送批量消息
            List<Message> messages = new ArrayList<>();
            for (int i = 0; i < 10; i++) {
                Message batchMsg = new Message("TopicTest", "TagA", "OrderID00" + i, ("Hello world " + i).getBytes(RemotingHelper.DEFAULT_CHARSET));
                messages.add(batchMsg);
            }
            producer.send(messages);
 
            // 9. 发送有序消息
            Message orderlyMsg = new Message("TopicTest", "TagA", "OrderID002", "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
            orderlyMsg.setFlag(Message.FLAG_ORDERLY);
            producer.send(orderlyMsg);
 
            // 10. 发送带Tag的消息
            Message tagMsg = new Message("TopicTest", "TagB", "OrderID003", "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
            producer.send(tagMsg);
 
            // 11. 发送带Key的消息
            Message keyMsg = new Message("