在SPRING INTEGRATION中，如果要從非SPRING INTEGRATION代碼發(fā)送MESSAGE到SPRING INTEGRATION程序，通常用BUS GATEWAY。
那么在SPRING CLOUD STREAM中，如果要從非SPRING CLOUD STREAM代碼發(fā)送MESSAGE到SPRING CLOUD STREAM程序，通常就要先通知框架自動生成一個SOURCE。
application.property
spring.cloud.stream.source=supplier
spring.cloud.stream.bindings.supplier-out-0.destination=notification-events
java
streamBridge.send("supplier-out-0", userDto);
Reference:
https://blog.devgenius.io/event-driven-microservices-with-spring-cloud-stream-e034eee3f394