如何使用@import导入实现了ImportBeanDefinitionRegistrar接口的类

在程序开发的时候，我们经常会遇见一个名词“接口”这也是我们做开发人员工作中必不可少的一个技术，接下来就和大家分享一下怎么使用@import导入实现了ImportBeanDefinitionRegistrar接口的类。

package com.example.demo9;

import com.example.demo9.server.MyServer;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.ConfigurableApplicationContext;

import java.util.Arrays;

@SpringBootApplication

public class Demo9Application {

public static void main(String[] args) { ConfigurableApplicationContext context = SpringApplication.run(Demo9Application.class, args); String[] beanNamesForType = context.getBeanNamesForType(MyServer.class); System.out.println(Arrays.asList(beanNamesForType).toString()); context.close();}

}

public interface MyServer {

void fun();

}

package com.example.demo9.server;

//这里最好不要加@Service,除非有其它要求

public class MyServerAImp implements MyServer{

@Overridepublic void fun() { System.out.println("MyServerAImp>>>>>>>>>>>>>>");}

}

package com.example.demo9.server;

//这里最好不要加@Service,除非有其它要求

public class MyServerBImp implements MyServer{

@Overridepublic void fun() { System.out.println("MyServerBImp>>>>>>>>>>>>>>");}

}

package com.example.demo9.registrar;

import com.example.demo9.server.MyServerAImp;

import com.example.demo9.server.MyServerBImp;

import org.springframework.beans.factory.support.BeanDefinitionRegistry;

import org.springframework.beans.factory.support.GenericBeanDefinition;

import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;

import org.springframework.core.type.AnnotationMetadata;

public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {

@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { //GenericBeanDefinition对象设置BeanDefinition GenericBeanDefinition genericBeanDefinitionMyServerAImp=new GenericBeanDefinition(); genericBeanDefinitionMyServerAImp.setBeanClass(MyServerAImp.class); GenericBeanDefinition genericBeanDefinitionMyServerBImp=new GenericBeanDefinition(); genericBeanDefinitionMyServerBImp.setBeanClass(MyServerBImp.class); //注册 registry.registerBeanDefinition("genericBeanDefinitionMyServerAImp",genericBeanDefinitionMyServerAImp); registry.registerBeanDefinition("genericBeanDefinitionMyServerBImp",genericBeanDefinitionMyServerBImp);}

}

package com.example.demo9.configuration;

import com.example.demo9.registrar.MyImportBeanDefinitionRegistrar;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Import;

@Configuration

@Import(MyImportBeanDefinitionRegistrar.class)

public class MyConfiguration {

}