bean自身級生命周期接口
- 配置文件中的init-method和destroy-method方法
- bean實現BeanNameAware、BeanFactoryAware、InitializingBean和DiposableBean這些接口的方法
做個實驗看一下這些方法的調用順序
先是兩個bean
package autopackage;
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 Person implements BeanFactoryAware, BeanNameAware,InitializingBean,DisposableBean {
private Fruit fruit;
private String name;
public Person(String name, Fruit fruit) {
System.out.println("I'm the Person1");
this.name = name;
this.fruit = fruit;
}
public Person(Fruit fruit) {
System.out.println("I'm the Person2");
this.fruit = fruit;
}
public void setFruit(Fruit fruit) {
System.out.println("I'm the setFruit");
this.fruit = fruit;
}
public void setName(String name) {
System.out.println("I'm the setName");
this.name = name;
}
public void init() {
System.out.println("I'm the init");
}
public void destroy1() {
System.out.println("I'm the destroy1");
}
public void eat() {
System.out.println(name+"正在吃"+fruit.getName()+"...");
}
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
System.out.println("I'm the BeanFactoryAware.setBeanFactory");
}
@Override
public void setBeanName(String s) {
System.out.println("I'm the BeanNameAware.setBeanName");
}
@Override
public void afterPropertiesSet() throws Exception {
System.out.println("I'm the InitializingBean.afterPropertiesSet");
}
@Override
public void destroy() {
System.out.println("I'm the DisposableBean.destroy");
}
}
package autopackage;
public class Fruit {
private String name;
public Fruit(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
接著是xml配置文件
<?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">
<bean id="person" class="autopackage.Person" init-method="init" destroy-method="destroy1">
<!--<constructor-arg value="lkxiaolou" />-->
<constructor-arg ref="fruit" />
<property name="name" value="lkxiaolou"/>
</bean>
<bean id="fruit" class="autopackage.Fruit">
<constructor-arg value="apple" />
</bean>
</beans>
再是測試代碼
package main;
import autopackage.Person;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class PersonMain {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("Person.xml");
Person person = (Person) context.getBean("person");
person.eat();
context.registerShutdownHook();
}
}
執行后會發現輸出是這樣的：
I'm the Person2
I'm the setName
I'm the BeanNameAware.setBeanName
I'm the BeanFactoryAware.setBeanFactory
I'm the InitializingBean.afterPropertiesSet
I'm the init
lkxiaolou正在吃apple...
I'm the DisposableBean.destroy
I'm the destroy1
容器級生命周期接口方法
包括了InstantiationAwareBeanPostProcessor 和 BeanPostProcessor這兩個接口實現，一般稱它們的實現類為“后處理器”,InstantiationAwareBeanPostProcessor 接口本質是BeanPostProcessor的子接口，我們繼承Spring為其提供的適配器類InstantiationAwareBeanPostProcessor Adapter來使用它。
將上面的代碼改造一下，新建一個新類
package autopackage;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class PersonBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
public PersonBeanFactoryPostProcessor() {
System.out.println("I'm the PersonBeanFactoryPostProcessor");
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
System.out.println("I'm the PersonBeanFactoryPostProcessor.postProcessBeanFactory");
}
}
package autopackage;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
public class PersonBeanPostProcessor implements BeanPostProcessor {
public PersonBeanPostProcessor() {
System.out.println("I'm the PersonBeanPostProcessor");
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonBeanPostProcessor.postProcessBeforeInitialization;beanName=" + beanName);
}
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonBeanPostProcessor.postProcessAfterInitialization;beanName=" + beanName);
}
return bean;
}
}
package autopackage;
import org.springframework.beans.BeansException;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Constructor;
public class PersonInstantiationAwareBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter {
public PersonInstantiationAwareBeanPostProcessor() {
super();
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor");
}
@Override
public Class<?> predictBeanType(Class<?> beanClass, String beanName) {
return super.predictBeanType(beanClass, beanName);
}
@Override
public Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, String beanName) throws BeansException {
return super.determineCandidateConstructors(beanClass, beanName);
}
@Override
public Object getEarlyBeanReference(Object bean, String beanName) throws BeansException {
return super.getEarlyBeanReference(bean, beanName);
}
@Override
public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException {
if (beanClass.equals(Person.class)) {
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation");
}
return super.postProcessBeforeInstantiation(beanClass, beanName);
}
@Override
public boolean postProcessAfterInstantiation(Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor.postProcessAfterInstantiation");
}
return super.postProcessAfterInstantiation(bean, beanName);
}
@Override
public PropertyValues postProcessPropertyValues(PropertyValues pvs, PropertyDescriptor[] pds, Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor.postProcessPropertyValues");
}
return super.postProcessPropertyValues(pvs, pds, bean, beanName);
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor.postProcessBeforeInitialization");
}
return super.postProcessBeforeInitialization(bean, beanName);
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Person) {
System.out.println("I'm the PersonInstantiationAwareBeanPostProcessor.postProcessAfterInitialization");
}
return super.postProcessAfterInitialization(bean, beanName);
}
}
xml修改一下
<?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">
<bean id="person" class="autopackage.Person" init-method="init" destroy-method="destroy1">
<!--<constructor-arg value="lkxiaolou" />-->
<constructor-arg ref="fruit" />
<property name="name" value="lkxiaolou"/>
</bean>
<bean id="fruit" class="autopackage.Fruit">
<constructor-arg value="apple" />
</bean>
<bean id="instantiationAwareBeanPostProcessor" class="autopackage.PersonInstantiationAwareBeanPostProcessor"></bean>
<bean id="beanPostProcessor" class="autopackage.PersonBeanPostProcessor"></bean>
<bean id="beanFactoryPostProcessor" class="autopackage.PersonBeanFactoryPostProcessor"></bean>
</beans>
其他不變，再執行一下輸出如下
I'm the PersonBeanFactoryPostProcessor
I'm the PersonBeanFactoryPostProcessor.postProcessBeanFactory
I'm the PersonInstantiationAwareBeanPostProcessor
I'm the PersonBeanPostProcessor
I'm the PersonInstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation
I'm the Person2
I'm the PersonInstantiationAwareBeanPostProcessor.postProcessAfterInstantiation
I'm the PersonInstantiationAwareBeanPostProcessor.postProcessPropertyValues
I'm the setName
I'm the BeanNameAware.setBeanName
I'm the BeanFactoryAware.setBeanFactory
I'm the PersonInstantiationAwareBeanPostProcessor.postProcessBeforeInitialization
I'm the PersonBeanPostProcessor.postProcessBeforeInitialization;beanName=person
I'm the InitializingBean.afterPropertiesSet
I'm the init
I'm the PersonInstantiationAwareBeanPostProcessor.postProcessAfterInitialization
I'm the PersonBeanPostProcessor.postProcessAfterInitialization;beanName=person
lkxiaolou正在吃apple...
I'm the DisposableBean.destroy
I'm the destroy1
總結
可以總結出整個bean的生命周期中各個鉤子執行的順序：
bean聲明周期中鉤子運行順序.jpg
