激活Aware

布满荆棘的人生 2023-07-18 06:00 3阅读 0赞

**目录**

1、概述

2、BeanFactoryAware 示例

创建普通类

创建BeanFactoryAware

spring配置

spring引导类

运行结果

--------------------

# 1、概述 #

Spring 提供了一些 Aware接口，比如BeanFactoryAware、ApplicationContextAware、ResourceLoaderAware等，实现Aware接口的bean在被初始化之后，可以取得一些相对应的资源。例如BeanFactoryAware 在 bean 初始化后，Spring容器将会注入 BeanFactory 的实例。

# 2、BeanFactoryAware 示例 #

## 创建普通类 ##

package thinking.in.spring.boot.samples.spring5.aware;
    
    public class Hello {
        public void say() {
            System.out.println("hello aware");
        }
    }

## 创建BeanFactoryAware ##

package thinking.in.spring.boot.samples.spring5.aware;
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.BeanFactory;
    import org.springframework.beans.factory.BeanFactoryAware;
    
    public class HelloAware implements BeanFactoryAware {
        private BeanFactory beanFactory;
        @Override
        public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
            this.beanFactory = beanFactory;
        }
    
        public void testHelloAware() {
            Hello hello = (Hello) this.beanFactory.getBean("hello");
            hello.say();
        }
    }

## spring配置 ##

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:customLabel="http://www.rh.com/schema/customLabel"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.rh.com/schema/customLabel
            http://www.rh.com/schema/customLabel.xsd">
    
        <bean id="hello" class="thinking.in.spring.boot.samples.spring5.aware.Hello" />
        <bean id="helloAware" class="thinking.in.spring.boot.samples.spring5.aware.HelloAware" />
    
    </beans>

## spring引导类 ##

package thinking.in.spring.boot.samples.spring5.bootstrap;
    
    import org.springframework.beans.factory.support.DefaultListableBeanFactory;
    import org.springframework.beans.factory.xml.XmlBeanFactory;
    import org.springframework.core.io.ClassPathResource;
    import thinking.in.spring.boot.samples.spring5.aware.HelloAware;
    import thinking.in.spring.boot.samples.spring5.circle.CircleA;
    import thinking.in.spring.boot.samples.spring5.circle.CircleB;
    import thinking.in.spring.boot.samples.spring5.circle.CircleC;
    
    public class AwareBootstrap {
    
        public static void main(String[] args) {
            DefaultListableBeanFactory defaultListableBeanFactory = new XmlBeanFactory(new ClassPathResource("application-aware.xml"));
            HelloAware helloAware = (HelloAware)defaultListableBeanFactory.getBean("helloAware");
            helloAware.testHelloAware();
        }
    }

## 运行结果 ##

信息: Loading XML bean definitions from class path resource [application-aware.xml]
    hello aware