In this post, we will learn about @Import annotation and its usage. You can see my previous post on how to create a simple spring core project.
What is @Import annotation and usage?
@Import annotation is equivalent to <import/> element in Spring XML configuration. It helps in splitting the single Java based configuration file into small, modular, maintainable and component based configuration. Let's see it with example.
@Configuration
@Import(value = { DBConfig.class, WelcomeGbConfig.class })
public class HelloGbAppConfig {
}
In above code snippet, we are importing two different configuration files viz. DBConfig, WelcomeGbConfig in application level configuration file HelloGbAppConfig.
The above code is equivalent to Spring XML based configuration below.
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <import resource="config/welcomegbconfig.xml"/> <import resource="config/dbconfig.xml"/> </beans>
You can see the full example code for Java based configuration on Github.