@Override
            public void onSuccess(String message) {
                System.out.printf("send %s and receive %s %n", "request string", message);
            }
Producer, using RocketMQTemplate sends a variety of messages
rocketmq-spring-boot-samples/rocketmq-produce-demo/src/main/java/org/apache/rocketmq/samples/springboot/ProducerApplication.java