ERROR CachingConnectionFactory Channel shutdown: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - unknown delivery tag 1, class-id=60, method-id=80)
默认是自动ack，然后你代码又手动ack，导致ack了两次，报了错。
配置文件设置为手动ack
spring.rabbitmq.listener.direct.acknowledge-mode=manual
