AnnotationBeanConfigurerAspect

AnnotationBeanConfigurerAspect是一个AspectJ切面，使用AspectJ语言定义。
通过上下文获取该切面后，调用其实例方法configureBean()，可对一个使用new关键字创建的对象进行配置，实现自动连线。

该切面属于制品spring-aspects：

dependencies {
    implementation ‘org.jetbrains.kotlin:kotlin-stdlib‘
    implementation ‘org.springframework:spring-context:5.2.0.RELEASE‘
    implementation ‘org.springframework:spring-aspects:5.2.0.RELEASE‘
}

configureBean()：

package bean

import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.beans.factory.annotation.Configurable
import org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation.ComponentScan
import org.springframework.stereotype.Component
import org.springframework.test.context.junit.jupiter.SpringExtension
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig

@Component
@Configurable(preConstruction = true)
open class A {
    @Autowired
    open var ctx: ApplicationContext? = null

    open fun foo() {
        println(ctx)
    }
}

@ExtendWith(SpringExtension::class)
@SpringJUnitConfig(ConfigurableTest::class)
@ComponentScan
@org.springframework.context.annotation.aspectj.EnableSpringConfigured
open class ConfigurableTest {
    @Autowired lateinit var ctx: ApplicationContext
    @Test fun main() {
        A().foo() // null
        ctx.getBean(A::class.java).foo() // not null

        val aspect = ctx.getBean(AnnotationBeanConfigurerAspect::class.java)
        val bean = A()
        bean.foo() // null
        aspect.configureBean(bean)
        bean.foo() // not null
    }
}

@Configurable

原文：https://www.cnblogs.com/develon/p/14613498.html