可以通過實現(xiàn)BeanDefinitionRegistryPostProcessor接口，它的父接口是BeanFactoryPostProcessor.
步驟：
一、自定義一個組件類：

package com.example.demo.service;


public class MusicService {
    public MusicService() {
        System.out.println("music service constructed!");
    }
}

二、定義類實現(xiàn)BeanDefinitionRegistryPostProcessor:

package com.example.demo.component;

import com.example.demo.service.MusicService;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.stereotype.Component;

@Component
public class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        System.out.println(registry.getBeanDefinitionCount());
        //定義BeanDefinition對象
        RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(MusicService.class);
        //將BeanDefinition對象注冊到容器
        registry.registerBeanDefinition("musicBean", rootBeanDefinition);
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println( beanFactory.getBeanDefinitionCount() );
    }
}

通過@Component注解，Spring就能夠掃描到MyBeanDefinitionRegistryPostProcessor,也就能夠把MusicService這個組件注冊到容器。
三、可以獲取在容器中通過MyBeanDefinitionRegistryPostProcessor注冊的bean文章來源地址http://www.zghlxwxcb.cn/news/detail-628688.html

package com.example.demo;

import com.example.demo.service.MusicService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.PropertySource;

@SpringBootApplication
@PropertySource("classpath:my.properties")
public class DemoApplication {

	public static void main(String[] args) {
		ConfigurableApplicationContext context = SpringApplication.run(DemoApplication.class, args);
		System.out.println("abc");

		MusicService musicService = context.getBean("musicBean", MusicService.class);
		System.out.println(musicService);

	}

}

到了這里，關(guān)于SpringBoot復(fù)習(xí)：（20）如何把bean手動注冊到容器？的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！