Spring 层次性依赖查找Bean

层次性依赖查找接口 - HierarchicalBeanFactory

双亲 BeanFactory:getParentBeanFactory()

层次性查找

根据 Bean 名称查找
- 基于 containsLocalBean 方法实现
根据 Bean 类型查找实例列表
- 单一类型:BeanFactoryUtils#beanOfType
- 集合类型:BeanFactoryUtils#beansOfTypeIncludingAncestors
根据 Java 注解查找名称列表
- BeanFactoryUtils#beanNamesForTypeIncludingAncestors

实体类Rumenz.java / SuperRumenz.java

package com.rumenz;
public class Rumenz extends SuperRumenz{private Integer id;private String name;@Overridepublic String toString() {return "Rumenz{" +"id=" + id +", name='" + name + '\'' +"} " + super.toString();}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}//SuperRumenz.javapackage com.rumenz;public class SuperRumenz {private String key;public String getKey() {return key;}public void setKey(String key) {this.key = key;}@Overridepublic String toString() {return "SuperRumenz{" +"key='" + key + '\'' +'}';}
}

**配置类Config.java / Config1.java **

package com.rumenz;
import org.springframework.context.annotation.Bean;public class Config {@Beanpublic SuperRumenz superRumenz(){SuperRumenz s=new SuperRumenz();s.setKey("超级管理员");return s;}
}// Config1.javapackage com.rumenz;
import org.springframework.context.annotation.Bean;public class Config1 {@Beanpublic static Rumenz rumenz(){Rumenz r = new Rumenz();r.setId(123);r.setName("入门小站");return r;}
}

案例DemoApplication.java

package com.rumenz;public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();ac.register(Config1.class);ac.refresh();ConfigurableListableBeanFactory beanFactory = ac.getBeanFactory();System.out.println("父容器"+beanFactory.getParentBeanFactory()); //null//层级的BeanFactory,创建一个父容器HierarchicalBeanFactory parentBeanFactory = createBeanFactory();displayBean(beanFactory,"rumenz");displayBean(parentBeanFactory,"superRumenz");//设置父容器beanFactory.setParentBeanFactory(parentBeanFactory);displayBean(beanFactory,"superRumenz");displayBean(parentBeanFactory,"rumenz");//递归查找Bean,双亲委派，先去父容器查找（parentBeanFactory），找不到最后去本地容器（beanFactory）查找displayContainsBean(beanFactory,"superRumenz");displayContainsBean(parentBeanFactory,"superRumenz");ac.close();}private static void displayBean(HierarchicalBeanFactory beanFactory,String beanName){System.out.println(beanFactory.containsLocalBean(beanName));}private static void displayContainsBean(HierarchicalBeanFactory beanFactory,String beanName){System.out.println(containsBean(beanFactory,beanName));}private static boolean containsBean(HierarchicalBeanFactory beanFactory,String beanName){BeanFactory parentBeanFactory = beanFactory.getParentBeanFactory();if(parentBeanFactory instanceof HierarchicalBeanFactory){HierarchicalBeanFactory hierarchicalBeanFactory = HierarchicalBeanFactory.class.cast(parentBeanFactory);if(containsBean(hierarchicalBeanFactory,beanName)){return true;}}return beanFactory.containsLocalBean(beanName);}private static HierarchicalBeanFactory createBeanFactory(){AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();ac.register(Config.class);ac.refresh();return ac.getBeanFactory();}
}

输出

父容器null
true
true
false
false
true
true

源码:https://github.com/mifunc/Spring-HierarchicalBean

原文: https://rumenz.com/rumenbiji/Spring-HierarchicalBean.html

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Spring 层次性依赖查找Bean

层次性依赖查找接口 - HierarchicalBeanFactory

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