高瑞林 通过本文主要向大家介绍了spring bean生命周期,spring中bean的作用域,spring 获取bean,spring中bean是什么,spring boot bean等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
1.以ApplocationContext上下文单例模式装配bean为例，深入探讨bean的生命周期：
（1）.生命周期图：
（2）.具体事例：
person类实现BeanNameAware,BeanFactoryAware接口
public class Person implements BeanNameAware ,BeanFactoryAware{
private String name;
public Person(){
System.out.println("调用构造器为属性值初始化");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public void setBeanName(String arg0) {
// TODO Auto-generated method stub
System.out.println("获取beanName id值"+" "+arg0);
}
@Override
public void setBeanFactory(BeanFactory arg0) throws BeansException {
// TODO Auto-generated method stub
System.out.println("获取BeanFactory" +" "+arg0);
}
}
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public class MyBeanPostProcessor implements BeanPostProcessor{
@Override
public Object postProcessAfterInitialization(Object arg0, String arg1) throws BeansException {
// TODO Auto-generated method stub
System.out.println("调用postProcessAfterInitialization");
return arg0;
}
@Override
public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
// TODO Auto-generated method stub
System.out.println("调用postProcessBeforeInitialization");
return arg0;
}
}
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ApplicationContext.xml配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- bean的配置文件 --> <bean id="person" class="org.jingdong.bean.life.Person"> <property name="name" value="grl"></property> </bean> <bean id="myBeanPostProcessor" class="org.jingdong.bean.life.MyBeanPostProcessor"></bean> </beans></div>
Main.java
public class Main {
public static void main(String[] args) {
// 创建IOC容器
ApplicationContext ac = new ClassPathXmlApplicationContext("org/jingdong/bean/life/applicationContext.xml");
//从容器中获取bean实例
Person person = (Person) ac.getBean("person");
//使用bean
System.out.println(person.getName());
}
}
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2.以Spring Factory装配bean为例：
（1）.生命周期图：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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