Bean的生命周期

1.domain

package com.baobaotao.domain;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.BeanFactoryAware;import org.springframework.beans.factory.BeanNameAware;import org.springframework.beans.factory.DisposableBean;import org.springframework.beans.factory.InitializingBean;public class Car implements BeanFactoryAware,BeanNameAware,InitializingBean,DisposableBean {private String brand;private String color;private   double price ;  private int maxSpeed;private BeanFactory beanFactory;private String beanName;/** * @return the brand */public String getBrand() {return brand;}/** * @param brand the brand to set */public void setBrand(String brand) {System.out.println("调用setBrand()设置属性");this.brand = brand;}/** * @return the color */public String getColor() {return color;}/** * @param color the color to set */public void setColor(String color) {this.color = color;}/** * @return the maxSpeed */public int getMaxSpeed() {return maxSpeed;}/** * @param maxSpeed the maxSpeed to set */public void setMaxSpeed(int maxSpeed) {this.maxSpeed = maxSpeed;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public Car() {System.out.println("调用Car()构造函数");}public Car(String brand, String color, int maxSpeed) {super();this.brand = brand;this.color = color;this.maxSpeed = maxSpeed;}public void myInit() {System.out.println("调用myInit()，将maxSpeed设置为240。");this.maxSpeed = 240;}public void myDestory() {System.out.println("调用myDestroy()。");}/* (non-Javadoc) * @see java.lang.Object#toString() */@Overridepublic String toString() {return "Car [brand=" + brand + ", color=" + color + ", maxSpeed="+ maxSpeed + "]";}public void introduce(){System.out.println(this.toString());}@Overridepublic void destroy() throws Exception {System.out.println("调用DisposableBean.destroy()");}@Overridepublic void afterPropertiesSet() throws Exception {System.out.println("调用InitializingBean.afterPropertiesSet()");}@Overridepublic void setBeanName(String name) {System.out.println("调用beanNameAware.setBeanName()");this.beanName = beanName;}@Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {System.out.println("调用beanFactoryAware.setBeanFactory()");this.beanFactory = beanFactory;}}

2.适配器InstantiationAwareBeanPostProcessorAdapter

package com.baobaotao.beanfactory;import java.beans.PropertyDescriptor;import org.springframework.beans.BeansException;import org.springframework.beans.PropertyValues;import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;public class MyInstantiationAwareBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter{public Object postProcessBeforeInstantiation(Class beanClass, String beanName)throws BeansException{if("car".equals(beanName)){System.out.println("InstantiationAware BeanPostProcessor.postProcessBeforeInstantiation");}return null;}public boolean postProcessAfterInstantiation(Object bean, String beanName)throws BeansException{if("car".equals(beanName)){System.out.println("InstantiationAware BeanPostProcessor.postProcessAfterInstantiation");}return true;}public PropertyValues postProcessPropertyValues(PropertyValues pvs, PropertyDescriptor[] pds, Object bean, String beanName)throws BeansException{if("car".equals(beanName)){System.out.println("Instantiation AwareBeanPostProcessor.postProcessPropertyValues");}return pvs;}}

3.BeanPostProcessor实现

package com.baobaotao.beanfactory;import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.BeanPostProcessor;import com.baobaotao.domain.Car;public class MyBeanPostProcessor implements BeanPostProcessor{@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName)throws BeansException {if(beanName.equals("car")){Car car = (Car)bean;if (car.getColor()==null){System.out.println("调用BeanPostProcessor.postProcess BeforeInitialization(),color为空，设置为默认黑色");car.setColor("黑色");}}return bean;}@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName)throws BeansException {if(beanName.equals("car")){Car car = (Car)bean;if (car.getMaxSpeed()>=200){System.out.println("调用BeanPostProcessor.postProcess AfterInitialization(),将maxSpeed调整为200");car.setMaxSpeed(200);;}}return bean;}}

4.beans.xml配置

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="car" class="com.baobaotao.domain.Car" init-method="myInit"destroy-method="myDestory" p:brand="红旗CA72" p:maxSpeed="200" scope="singleton" /></beans>

5.容器装载配置文件，注册两个处理器

package com.baobaotao.beanfactory;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.config.ConfigurableBeanFactory;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;import com.baobaotao.domain.Car;public class BeanLifeCycle {private static void LifeCycleInBeanFactory(){Resource res = new ClassPathResource("com/baobaotao/beanfactory/beans.xml");BeanFactory bf = new XmlBeanFactory(res);((ConfigurableBeanFactory)bf).addBeanPostProcessor(new MyBeanPostProcessor());((ConfigurableBeanFactory)bf).addBeanPostProcessor(new MyInstantiationAwareBeanPostProcessor());Car car1 = (Car)bf.getBean("car");car1.introduce();car1.setColor("红色");Car car2 = (Car)bf.getBean("car");System.out.println("car1==car2:"+(car1==car2));((XmlBeanFactory)bf).destroySingletons();}public static void main(String[] args) {LifeCycleInBeanFactory();}}