xml配置

<bean id = "car" class="cycle.Car" init-method="init">
        <property name="brand" value="bmw"></property>
    </bean>
    <!-- 
    BeanPostProcessor接口
    实现初始化前后的两个方法postProcessAfterInitialization     postProcessBeforeInitialization
    bean是返回的实例
    beanname是ioc容器配置bean的
     -->
    <bean class="cycle.MyBeanProcessor"></bean>

实现BeanPostProcessor接口

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

public class MyBeanProcessor implements BeanPostProcessor{

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanname)
            throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("afterinit");
        return bean;
    }
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanname)
            throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("beforeinit");
        return bean;
    }
}

生命周期代码

ApplicationContext c = new ClassPathXmlApplicationContext("bean-cycle.xml");
        Car car = (Car) c.getBean("car2");
        System.out.println(car);

结果

construction
注入属性
beforeinit
init....
afterinit
Car [brand=bmw]
IOC容器创建bean实例-->属性注入-->初始化前置方法执行-->进行初始化-->初始化后置方法执行-->获得实例bean

实体类

package cycle;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Car {

    String brand;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        System.out.println("注入属性");
        this.brand = brand;
    }

    @Override
    public String toString() {
        return "Car [brand=" + brand + "]";
    }

    public Car(String brand) {
        super();
        this.brand = brand;
    }

    public Car() {
//      super();
        System.out.println("construction");
    }
    
    
    
    public void init(){
        System.out.println("init....");
    }
    
    
    public static void main(String[] args) {
        ApplicationContext c = new ClassPathXmlApplicationContext("bean-cycle.xml");
        Car car =  (Car) c.getBean("car");
        System.out.println(car);
        
    }
}