rocketmq批量消息投递

String topic = "BatchTest";
List<Message> messages = new ArrayList<>();
messages.add(new Message(topic, "TagA", "Order1", "Hello world 0".getBytes()));
messages.add(new Message(topic, "TagA", "Order2", "Hello world 1".getBytes()));
messages.add(new Message(topic, "TagA", "Order3", "Hello world 2".getBytes()));
try {
    producer.send(messages);
} catch (Exception e) {
    e.printStackTrace();
}