如何以编程方式在spring-boot中获取当前的SpringApplication实例？

Question

How to get current SpringApplication instance in spring-boot programmatically? As spring docs says : SpringApplication has a method called isWebEnvironment() . I don't know how to tell if an application is a web or non-web application programmtically , can I get it from ApplicationContext.getEnvironment() ? By the way , I don't want to solve this by searching xxServlet like HttpServletRequest ... etc.

Answer 1

What about applicationContext instanceof WebApplicationContext ?

If you're trying to simply determine whether or not your application is running in a web context, then you can use the fact that when a Spring application is started in a web context, the ApplicationContext object you have access to is an instance of the WebApplicationContext interface. Therefore you can simply write

isWebEnvironment = (applicationContext instanceof WebApplicationContext);

There is no real reason to get the SpringApplication object from your class, as its sole purpose is to build an ApplicationContext .

Answer 2

If you are using Spring Boot you can use this:

String[] springBootAppBeanName = applicationContext.getBeanNamesForAnnotation(org.springframework.boot.autoconfigure.SpringBootApplication.class);
applicationContext.getBean(springBootAppBeanName[0]);

This will retrieve the spring bean names who are annotated with @SpringBootApplication , after get them you can simple get the instance by his name.