Spring Bean的残缺生命周期
Spring Bean的残缺生命周期从创立Spring容器开始，直到最终Spring容器销毁Bean。
若容器注册了以上各种接口，那么程序将会依照以上的流程进行。
生命周期调用接口分析
1、Bean本身的办法：这个包含了Bean自身调用的办法和通过配置文件中<bean>的init-method和destory-method指定的办法。
2、Bean级生命周期接口办法：这个包含了BeanNameAware、BeanFactoryAware、InitailizingBean和DiposableBean等接口办法。
3、容器级生命周期接口办法：这个包含了InstantiationAwareBeanPostProcessor和BeanPostProcessor这两个接口实现，个别称它们的实现类为”后处理器“。
4、工厂后处理接口办法：这个包含了AspectJWeavingEnabler,ConfigurationClassPostcessor,CustomAutowireConfigurer等等十分有用的工厂后处理器接口的办法。工厂后处理器也是容器级的。在利用上下文拆卸配置文件知乎立刻调用。
演示
1、这是一个简略的Spring Bean，调用Bean本身的办法和Bean级生命周期接口办法，为了不便演示，它实现了BeanNameAware、BeanFactoryAware、InitializingBean和DiposableBean这4个接口，同时有2个办法，对应配置文件中<bean>的init-method和destory-method。
package springBeanTest;
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;
/**
* @author qsk
*/
public class Person implements BeanFactoryAware, BeanNameAware,
InitializingBean, DisposableBean {
private String name;
private String address;
private int phone;
private BeanFactory beanFactory;
private String beanName;
public Person() {
System.out.println("【结构器】调用Person的结构器实例化");
}
public String getName() {
return name;
}
public void setName(String name) {
System.out.println("【注入属性】注入属性name");
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
System.out.println("【注入属性】注入属性address");
this.address = address;
}
public int getPhone() {
return phone;
}
public void setPhone(int phone) {
System.out.println("【注入属性】注入属性phone");
this.phone = phone;
}
@Override
public String toString() {
return "Person [address=" + address + ", name=" + name + ", phone="
+ phone + "]";
}
// 这是BeanFactoryAware接口办法
@Override
public void setBeanFactory(BeanFactory arg0) throws BeansException {
System.out
.println("【BeanFactoryAware接口】调用BeanFactoryAware.setBeanFactory()");
this.beanFactory = arg0;
}
// 这是BeanNameAware接口办法
@Override
public void setBeanName(String arg0) {
System.out.println("【BeanNameAware接口】调用BeanNameAware.setBeanName()");
this.beanName = arg0;
}
// 这是InitializingBean接口办法
@Override
public void afterPropertiesSet() throws Exception {
System.out
.println("【InitializingBean接口】调用InitializingBean.afterPropertiesSet()");
}
// 这是DiposibleBean接口办法
@Override
public void destroy() throws Exception {
System.out.println("【DiposibleBean接口】调用DiposibleBean.destory()");
}
// 通过<bean>的init-method属性指定的初始化办法
public void myInit() {
System.out.println("【init-method】调用<bean>的init-method属性指定的初始化办法");
}
// 通过<bean>的destroy-method属性指定的初始化办法
public void myDestory() {
System.out.println("【destroy-method】调用<bean>的destroy-method属性指定的初始化办法");
}
}2、演示BeanPostProcessor接口：
BeanPostProcessor接口包含2个办法postProcessAfterInitialization和postProcessBeforeInitialization，这两个办法的第一个参数都是要解决的Bean对象，第二个参数都是Bean的name。返回值也都是要解决的Bean对象。这里要留神。
package springBeanTest;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
public class MyBeanPostProcessor implements BeanPostProcessor {
public MyBeanPostProcessor() {
super();
System.out.println("这是BeanPostProcessor实现类结构器！！");
// TODO Auto-generated constructor stub
}
@Override
public Object postProcessAfterInitialization(Object arg0, String arg1)
throws BeansException {
System.out
.println("BeanPostProcessor接口办法postProcessAfterInitialization对属性进行更改！");
return arg0;
}
@Override
public Object postProcessBeforeInitialization(Object arg0, String arg1)
throws BeansException {
System.out
.println("BeanPostProcessor接口办法postProcessBeforeInitialization对属性进行更改！");
return arg0;
}
}3、InstantiationAwareBeanPostProcessor 接口实质是BeanPostProcessor的子接口，个别咱们继承Spring为其提供的适配器类InstantiationAwareBeanPostProcessor Adapter来应用它，如下：
package springBeanTest;
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 MyInstantiationAwareBeanPostProcessor() {
super();
System.out
.println("这是InstantiationAwareBeanPostProcessorAdapter实现类结构器！！");
}
// 接口办法、实例化Bean之前调用
@Override
public Object postProcessBeforeInstantiation(Class beanClass,
String beanName) throws BeansException {
System.out
.println("InstantiationAwareBeanPostProcessor调用postProcessBeforeInstantiation办法");
return null;
}
// 接口办法、实例化Bean之后调用
@Override
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
System.out
.println("InstantiationAwareBeanPostProcessor调用postProcessAfterInitialization办法");
return bean;
}
// 接口办法、设置某个属性时调用
@Override
public PropertyValues postProcessPropertyValues(PropertyValues pvs,
PropertyDescriptor[] pds, Object bean, String beanName)
throws BeansException {
System.out
.println("InstantiationAwareBeanPostProcessor调用postProcessPropertyValues办法");
return pvs;
}
}这个有3个办法，其中第二个办法postProcessAfterInitialization就是重写了BeanPostProcessor的办法。第三个办法postProcessPropertyValues用来操作属性，返回值也应该是PropertyValues对象。
4、演示工厂后处理器接口办法
package springBeanTest;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
public MyBeanFactoryPostProcessor() {
super();
System.out.println("这是BeanFactoryPostProcessor实现类结构器！！");
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0)
throws BeansException {
System.out
.println("BeanFactoryPostProcessor调用postProcessBeanFactory办法");
BeanDefinition bd = arg0.getBeanDefinition("person");
bd.getPropertyValues().addPropertyValue("phone", "110");
}
}5、配置文件如下beans.xml，很简略，应用ApplicationContext,处理器不必手动注册：
<?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"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">
<bean id="beanPostProcessor" class="springBeanTest.MyBeanPostProcessor">
</bean>
<bean id="instantiationAwareBeanPostProcessor" class="springBeanTest.MyInstantiationAwareBeanPostProcessor">
</bean>
<bean id="beanFactoryPostProcessor" class="springBeanTest.MyBeanFactoryPostProcessor">
</bean>
<bean id="person" class="springBeanTest.Person" init-method="myInit"
destroy-method="myDestory" scope="singleton" p:name="张三" p:address="广州"
p:phone="15900000000" />
</beans>
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