Spring阶段性学习总结（六）Bean的生命周期

package SpringBeansCycle;

public class Car {
    private String brand;

    public Car() {
        System.out.println("我是一个构造器");
    }

    public void init() {
        System.out.println("this is a init!");
    }

    public void destory() {
        System.out.println("this is a destory!");
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

}

package SpringBeansCycle;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyBeanPostProcesser implements BeanPostProcessor {

    @Override
    public Object postProcessBeforeInitialization(Object o, String s) throws BeansException {
        System.out.println(s);
        return o;
    }

    @Override
    public Object postProcessAfterInitialization(Object o, String s) throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return o;
    }
}

package SpringBeansCycle;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("SpringBeansCycle/beans-cycle.xml");
        Car car = (Car) ctx.getBean("car");
        System.out.println(car);
        //关闭IOC容器
        ctx.close();
    }
}

<?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">
        <!--定义一个类实现BeanPostProcessor类之后可以在配置文件中，配置只有class的bean然后在调用实例类的初始化方法的时候，会对该类进行前后的调用-->
            <bean id="car" class="SpringBeansCycle.Car"
                  init-method="init" destroy-method="destory">
                <property name="brand" value="#{'宝马'}"></property>
            </bean>
            <bean class="SpringBeansCycle.MyBeanPostProcesser"></bean>

</beans>