spring @Import结合org.springframework.context.annotation.ImportBeanDefinitionRegistrar接口，给容器注入组件

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本文通过实例演示了如何使用Spring框架的ImportBeanDefinitionRegistrar接口来手动注册Bean，并展示了从pom.xml依赖配置到实体类定义，再到实现Bean注册的具体过程。

1、pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.6.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.2</version>
    </dependency>
</dependencies>

2、实体类

import lombok.Data;

@Data
public class Student {
    private String name;
    private int age;
}

3、实现ImportBeanDefinitionRegistrar接口，注册bean的业务类

import com.it.huaxin.vo.Student;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;

public class CallImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {
    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(Student.class);
        registry.registerBeanDefinition("student", rootBeanDefinition);
    }
}

4、配置类

import com.it.huaxin.importbeandefinitionregistrar.CallImportBeanDefinitionRegistrar;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Import(value = {CallImportBeanDefinitionRegistrar.class})
@Configuration
public class ImportBeanDefinitionRegistrarConfig {
}

5、测试类

import com.it.huaxin.config.ImportBeanDefinitionRegistrarConfig;
import com.it.huaxin.vo.Student;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class ImportBeanDefinitionRegistrarTest {
    public static void main(String [] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ImportBeanDefinitionRegistrarConfig.class);
        Student bean = context.getBean(Student.class);
        System.out.println(bean);
        System.out.println("Spring IOC容器创建完成........");
    }
}

//结果：

Student(name=null, age=0)
Spring IOC容器创建完成........