BeanPostProcessor和BeanFactoryPostProcessor区别

在spring容器加载了bean的定义文件之后,在bean实例化之前执行的。接口方法入参是ConfigurrableListableBeanFactory,使用该参数,可以获取到相关bean的定义信息。

spring中,有内置的一些BeanFactoryPostProcessor实现类,常用的有&＃xff1a;
org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
org.springframework.beans.factory.config.PropertyOverrideConfigurer
org.springframework.beans.factory.config.CustomEditorConfigurer:用来注册自定义的属性编辑器

是在spring容器加载了bean的定义文件并且实例化bean之后执行的。BeanPostProcessor的执行顺序是在BeanFactoryPostProcessor之后。

spring中,有内置的一些BeanPostProcessor实现类,例如&＃xff1a;

org.springframework.context.annotation.CommonAnnotationBeanPostProcessor:支持&＃64;Resource注解的注入
org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor:支持&＃64;Required注解的注入
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor:支持&＃64;Autowired注解的注入
org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor:支持&＃64;PersistenceUnit和&＃64;PersistenceContext注解的注入
org.springframework.context.support.ApplicationContextAwareProcessor:用来为bean注入ApplicationContext等容器对象

org.springframeworkspring-context5.2.0.RELEASE


       xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance" xmlns:context&＃61;"http://www.springframework.org/schema/context"
       xmlns:aop&＃61;"http://www.springframework.org/schema/aop"
       xsi:schemaLocation&＃61;"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"
       default-autowire&＃61;"byName">

   
       
       
   

   
   

package processpost;
import org.springframework.beans.BeansException;
import org.springframework.beans.MutablePropertyValues;
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 {&＃64;Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {System.out.println("&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;调用MyBeanFactoryPostProcessor的postProcessBeanFactory&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;");BeanDefinition bd &＃61; beanFactory.getBeanDefinition("myTestBean");System.out.println("属性值:"&＃43;bd.getPropertyValues().toString());MutablePropertyValues pv &＃61; bd.getPropertyValues();if(pv.contains("remark")){pv.addPropertyValue("remark","修改后备注");}bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);}
}


package processpost;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;public class MyBeanPostProcessor implements BeanPostProcessor {&＃64;Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {System.out.println("BeanPostProcessor&＃xff0c;对象" &＃43; beanName &＃43; "调用初始化方法之前的数据&＃xff1a; " &＃43; bean.toString());return bean;}&＃64;Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {System.out.println("BeanPostProcessor&＃xff0c;对象" &＃43; beanName &＃43; "调用初始化方法之后的数据&＃xff1a;" &＃43; bean.toString());return bean;}
}


package processpost;
import org.springframework.beans.factory.InitializingBean;public class MyTestBean implements InitializingBean {private String name;private String remark;public MyTestBean(){System.out.println("&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;MyTestBean构造函数执行了&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;");}public String getName() {return name;}public void setName(String name) {System.out.println("调用setName方法");this.name &＃61; name;}public String getRemark() {return remark;}public void setRemark(String remark) {System.out.println("调用了setRemark方法");this.remark &＃61; remark;}&＃64;Overridepublic String toString() {return "MyTestBean{" &＃43;"name&＃61;&＃39;" &＃43; name &＃43; &＃39;\&＃39;&＃39; &＃43;", remark&＃61;&＃39;" &＃43; remark &＃43; &＃39;\&＃39;&＃39; &＃43;&＃39;}&＃39;;}&＃64;Overridepublic void afterPropertiesSet() throws Exception {System.out.println("调用afterPropertiesSet方法");this.remark &＃61; "在初始化方法中修改之后的描述信息";}public void initMethod() {System.out.println("调用initMethod方法");}}


package processpost;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class PostProcessTest {public static void main(String[] args) {ApplicationContext applicationContext &＃61; new ClassPathXmlApplicationContext("postprocess.xml");MyTestBean myTestBean &＃61; (MyTestBean) applicationContext.getBean("myTestBean");System.out.println(myTestBean.toString());}
}


执行结果:

从上面的结果可以看出,BeanFactoryPostProcessor在bean实例化之前执行,之后实例化bean(调用构造函数,并调用set方法注入属性值),然后在调用两个初始化方法前后,执行了BeanPostProcessor。初始化方法的执行顺序是,先执行afterPropertiesSet,再执行init-method。也符合Bean的生命周期里的几大步骤:实例化->属性赋值->初始化->销毁