bean生命周期

1、bean对象

    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        System.out.println("2、setname...");
        this.name = name;
    }
    public User() {
        System.out.println("1、无参构造...");
    }
    public void initUser(){
        System.out.println("4、初始化...");
    }
    public void destroyUser(){
        System.out.println("7、销毁...");
    }

2、bean后置处理器

public class BeanPost implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) {
        System.out.println("3、后置处理器，初始化之前...");
        System.out.println(beanName+"::"+bean);
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName)  {
        System.out.println("5、后置处理器，初始化之后...");
        System.out.println(beanName+"::"+bean);
        return bean;
    }
}

3、配置bean.xml

    <bean id="user" class="com.jixian.spring.entity.User" init-method="initUser" destroy-method="destroyUser">
        <property name="name" value="jixian"/>
    </bean>
    <bean id="beanPost" class="com.jixian.spring.entity.BeanPost"/>

4、测试

        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
        User user = applicationContext.getBean(User.class);
        System.out.println("6、bean对象创建完成...");
        System.out.println(user);
        applicationContext.close();