1、实现InitializingBean接口的afterPropertiesSet()方法,当beanFactory创建好对象,且把bean所有属性设置好之后,会调用这个方法,相当于初始化方法。
2、实现DisposableBean的destory方法,当bean销毁时会把单实例bean进行销毁
package com.enjoy.cap7;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;
/**
* 声明为组件 当我们的扫描器 扫描之后也会被加入到 容器中
*/
@Component
public class Train implements InitializingBean, DisposableBean {
public Train(){
System.out.println("Train 构造器");
}
/**
* 当我们的bean销毁时调用该方法
* @throws Exception
*/
@Override
public void destroy() throws Exception {
System.out.println("Train 销毁");
}
/**
* bean 所有的属性被设置之后会调用该方法
*
* 当我们的bean属性赋值和初始化完成时调用
* @throws Exception
*/
@Override
public void afterPropertiesSet() throws Exception {
System.out.println(
"Train 在bean 设置属性之后 执行"
);
}
}
package com.enjoy.cap7;
import com.enjoy.cap1.Person;
import com.enjoy.cap6.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@ComponentScan(value = "com.enjoy.cap7")
@Configuration
@Import(value = {Dog.class,Cat.class,TTTTImportSelector.class,TTTImportBeanDefinitionRegistrar.class})
public class MainConfig {
@Bean("person")
public Person zhangsan(){
// System.out.println("给我们的容器中添加张三");
return new Person("张三",22);
}
// @Bean(initMethod = "init",destroyMethod = "destory")
// public Bike bike(){
// return new Bike();
// }
}
package test;
import com.enjoy.cap7.MainConfig;
import org.junit.jupiter.api.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* FactoryBean 和 BeanFactorty 有什么区别?
*
* FactoryBean :可以把我们的JAVA实例通过FactoryBean注入到容器中
*
* BeanFactorty:从我们的容器中获取实例化后的bean
*
*/
public class MainTEwst7 {
@Test
public void sss(){
AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
System.out.println("容器起用完成");
annotationConfigApplicationContext.close();
}
}
执行结果: