Java Web (5) on how to get spring beans in listener

1. Before the web system starts running, you need to populate the database with some pre-built data. Here you need a method that runs only once while the system is running, to implement the initialization process of the system.

Here, it's natural to think of Servletcontextlistener as such a listener, as described in the SERLVET-API documentation.

Interface for receiving notification events about ServletContext lifecycle changes.

and just, a web system, there is only one servletcontext.

2. Then the problem comes, spring initialization, loading the XML configuration is also using this one listener--org.springframework.web.context.contextloaderlistener.

So how do you get the beans through spring applicationcontext in the listener you define?

3. The answer is webapplicationcontextutils. This is a component in the Spring-web, you can use it to get applicationcontext, when you get the ApplicationContext, you naturally have the bean

Java Web (5) on how to get spring beans in listener