private List<TranHead> doTranHead(DataReceiveTrade para, BaseMessage<Object> baseMessage) { List<TranHead> tranHeadList = para.getTranHeadModelList(); if (tranHeadList != null && tranHeadList.size() > 0) { for (TranHead tranHead : tranHeadList) { setDefaultValueIfNull(tranHead); } baseMessage.setBody(tranHeadList); rocketMQTemplate.sendMessageInTransaction(Constants.POS_SALE_TOPIC + ":" + Constants.POS_SALE_TAG_TRAN_HEAD, baseMessage); rocketMQTemplate.sendMessageInTransaction(Constants.POS_SALE_TOPIC + ":" + Constants.POS_SALE_TAG_TRAN_HEAD, null); } return tranHeadList; } 我有这样一段伪代码, 在一个方法内连续发送两次rocketmq的事务消息, 我应该如和在spring boot环境实现呢, 给出详细代码

在Spring Boot中使用RocketMQ的事务消息，需要使用Spring的TransactionTemplate和RocketMQ的TransactionMQProducer来实现。你可以按照以下步骤进行实现：

1. 配置事务消息的TransactionMQProducer

@Configuration
public class RocketMQTransactionConfig {
    @Value("${rocketmq.namesrvAddr}")
    private String namesrvAddr;
    @Value("${rocketmq.producer.group}")
    private String producerGroup;
    @Autowired
    private TransactionListener transactionListener;

    @Bean(destroyMethod = "shutdown")
    public TransactionMQProducer transactionMQProducer() throws MQClientException {
        TransactionMQProducer producer = new TransactionMQProducer(producerGroup);
        producer.setNamesrvAddr(namesrvAddr);
        producer.setTransactionListener(transactionListener);
        producer.start();
        return producer;
    }
}

2. 实现TransactionListener接口

@Component
public class TransactionListenerImpl implements TransactionListener {
    @Autowired
    private RocketMQTemplate rocketMQTemplate;
    @Autowired
    private TransactionTemplate transactionTemplate;

    @Override
    public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
        // 在此处执行本地事务，如果本地事务执行成功则返回COMMIT_MESSAGE，否则返回ROLLBACK_MESSAGE
        return LocalTransactionState.UNKNOW;
    }

    @Override
    public LocalTransactionState checkLocalTransaction(MessageExt msg) {
        // 在此处检查本地事务的执行状态，如果本地事务已经成功则返回COMMIT_MESSAGE，否则返回ROLLBACK_MESSAGE
        return LocalTransactionState.UNKNOW;
    }
}

3. 在业务代码中发送事务消息

@Service
public class YourService {
    @Autowired
    private RocketMQTemplate rocketMQTemplate;
    @Autowired
    private TransactionMQProducer transactionMQProducer;

    public void sendMessageInTransaction() {
        TransactionTemplate transactionTemplate = new TransactionTemplate(transactionMQProducer.getTransactionCheckExecutor());
        transactionTemplate.execute(new TransactionCallback<Void>() {
            @Override
            public Void doInTransaction(TransactionStatus status) {
                try {
                    // 在此处发送第一次事务消息
                    rocketMQTemplate.sendMessageInTransaction("topic", new Message("tag", "body"));

                    // 在此处发送第二次事务消息
                    rocketMQTemplate.sendMessageInTransaction("topic", new Message("tag", "body"));

                    // 如果本地事务执行成功，则返回null，否则抛出异常
                    return null;
                } catch (Exception e) {
                    status.setRollbackOnly();
                    throw new RuntimeException(e);
                }
            }
        });
    }
}

以上代码是一个简单的示例，你可以根据自己的业务需求进行修改。