从jdk源码上看，beanfactory实现类需要支持bean的完整生命周期，完整的初始化方法及其标准顺序（格式：接口 方法）为:
1.beannameaware setbeanname 设置bean名称
2.beanclassloaderaware setbeanclassloader 设置bean类加载器
3.beanfactoryaware setbeanfactory 设置bean工厂
4.environmentaware setenvironment 设置环境：profiles+properties
5.embeddedvalueresolveraware setembeddedvalueresolver 设置嵌入式值解析器
6.resourceloaderaware setresourceloader 设置资源载入器，只适用于在应用程序上下文中运行
7.applicationeventpublisheraware setapplicationeventpublisher注入应用事件发布器applicationeventpublisher
8.messagesourceaware setmessagesource 设置国际化支持
9.applicationcontextaware setapplicationcontext 设置应用上下文
10.servletcontextaware setservletcontext 设置servlet上下文
11.beanpostprocessors postprocessbeforeinitialization 执行bean处理器前置方法
12.initializingbean afterpropertiesset 执行初始化bean设置完属性后置方法
13.a custom init-method definition 执行自定义初始化方法
14.beanpostprocessors postprocessafterinitialization 执行bean处理器后置方法
销毁顺序：
1.destructionawarebeanpostprocessors postprocessbeforedestruction 销毁处理器的前置方法
2.disposablebean destroy bean销毁回调方法
3.a custom destroy-method definition 用户自定义销毁方法
核心方法流程图：
二、测试验证
2.1分析原理
前面说的17个步骤都可以测试，我们选取其中的8个步骤进行测试如下：
初始化流程：
1.beannameaware setbeanname 设置bean名称
3.beanfactoryaware setbeanfactory 设置bean工厂
11.beanpostprocessors postprocessbeforeinitialization 执行bean处理器前置方法
12.initializingbean afterpropertiesset 执行初始化bean设置完属性后置方法
13.a custom init-method definition 执行自定义初始化方法
14.beanpostprocessors postprocessafterinitialization 执行bean处理器后置方法
销毁流程：
2.disposablebean destroy bean销毁回调方法
3.a custom destroy-method definition 用户自定义销毁方法
2.2 代码清单
1.构建一个person类，实现beanfactoryaware, beannameaware, initializingbean, disposablebean接口。
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package spring.ioc;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 string name; private string mobile; public person() { super(); system.out.println("[构造器] 调用person的构造器实例化"); } public string getname() { return name; } public void setname(string name) { system.out.println("[属性注入] name="+name); this.name = name; } public string getmobile() { return mobile; } public void setmobile(string mobile) { system.out.println("[属性注入] mobile="+mobile); this.mobile = mobile; } @override public void destroy() throws exception { system.out.println("[接口disposablebean.destroy() ]"); } @override public void afterpropertiesset() throws exception { system.out.println("[接口initializingbean.afterpropertiesset() ]"); } @override public void setbeanname(string name) { system.out.println("[接口beannameaware.setbeanname() ]"); } @override public void setbeanfactory(beanfactory beanfactory) throws beansexception { system.out.println("[接口beanfactoryaware.setbeanfactory() ]"); } public void myinit(){ system.out.println("[init-method]调用<bean>的init-method属性指定的初始化方法"); } public void mydestory() { system.out.println("[destroy-method]调用<bean>的destroy-method属性指定的销毁方法"); }} |
2.自定义工厂后处理器，复写postprocessbeanfactory方法，获取bean定义后添加属性mobile=110
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package spring.ioc;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;/** * * @classname:mybeanfactorypostprocessor * @description:自定义工厂后处理器 * @author diandian.zhang * @date 2017年10月25日下午7:14:09 */public class mybeanfactorypostprocessor implements beanfactorypostprocessor { public mybeanfactorypostprocessor() { super(); system.out.println("[mybeanfactorypostprocessor工厂后处理器]beanfactorypostprocessor实现类构造器！！"); } @override public void postprocessbeanfactory(configurablelistablebeanfactory arg0) throws beansexception { system.out.println("[mybeanfactorypostprocessor工厂后处理器]beanfactorypostprocessor.postprocessbeanfactory()获取bean定义后添加属性mobile=110"); beandefinition bd = arg0.getbeandefinition("person"); bd.getpropertyvalues().addpropertyvalue("mobile", "110"); }} |
3.自定义bean后处理器，复写postprocessbeforeinitialization和postprocessafterinitialization2个方法，分别对应初始化前后时的操作。
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package spring.ioc;import org.springframework.beans.beansexception;import org.springframework.beans.factory.config.beanpostprocessor;/** * * @classname:mybeanpostprocessor * @description:自定义bean后处理器 * @author diandian.zhang * @date 2017年10月25日下午7:03:53 */public class mybeanpostprocessor implements beanpostprocessor { public mybeanpostprocessor() { super(); system.out.println("这是beanpostprocessor实现类构造器！！"); } /** * * @description 初始化前，处理器 * @param bean * @param beanname * @return * @throws beansexception * @author diandian.zhang * @date 2017年10月25日下午7:07:02 * @see org.springframework.beans.factory.config.beanpostprocessor#postprocessbeforeinitialization(java.lang.object, java.lang.string) */ @override public object postprocessbeforeinitialization(object bean, string beanname) throws beansexception { system.out.println("beanpostprocessor接口方法postprocessbeforeinitialization对属性进行更改！beanname="+beanname); return bean; } /** * * @description 初始化后，处理器 * @param bean * @param beanname * @return * @throws beansexception * @author diandian.zhang * @date 2017年10月25日下午7:07:07 * @see org.springframework.beans.factory.config.beanpostprocessor#postprocessafterinitialization(java.lang.object, java.lang.string) */ @override public object postprocessafterinitialization(object bean, string beanname) throws beansexception { system.out.println("beanpostprocessor接口方法postprocessafterinitialization对属性进行更改！beanname="+beanname); return bean;//注意，如果返回null,后续beanpostprocessor不会再执行 } } |
4.自定义实例化bean后处理器适配器，复写postprocessbeforeinstantiation、postprocessbeforeinstantiation、postprocesspropertyvalues分别对应实例化bean前调用、实例化bean后调用、设置某个属性时调用
注意：instantiationawarebeanpostprocessoradapter ，这里是实例化instantiation，不是初始化initialization！！！
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package spring.ioc;import java.beans.propertydescriptor;import org.springframework.beans.beansexception;import org.springframework.beans.propertyvalues;import org.springframework.beans.factory.config.instantiationawarebeanpostprocessoradapter;/** * * @classname:myinstantiationawarebeanpostprocessor * @description:beanpostprocessor的子类，增加了更多自定方法 * @author diandian.zhang * @date 2017年10月25日下午7:09:15 */public class myinstantiationawarebeanpostprocessor extends instantiationawarebeanpostprocessoradapter { public myinstantiationawarebeanpostprocessor() { super(); system.out.println("这是instantiationawarebeanpostprocessoradapter实现类构造器！！"); } // 接口方法、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方法[实例化bean之前调用 ]beanname="+beanname); return null; } // 接口方法、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方法[实例化bean之后调用]beanname="+beanname); return bean; } // 接口方法、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方法 pvs="+pvs+",beanname="+beanname); return pvs; }} |
5.测试类，使用classpathxmlapplicationcontext从xml中读取bean配置文件生成applicationcontext容器应用上下文，这一步对应容器初始化。第二部从应用上下文中获取bean。最后一步注册一个关闭钩子，在容器关闭时触发。
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package spring.ioc;import org.junit.test; 6 import org.springframework.context.applicationcontext;import org.springframework.context.support.classpathxmlapplicationcontext;10import spring.aop.xml.dao.dao;/** * * @classname:ioctest * @description:测试类 * @author diandian.zhang * @date 2017年10月25日下午4:42:01 */public class ioctest { @test public void iocpersontest(){ system.out.println("=============容器初始化======start========="); @suppresswarnings("resource") applicationcontext applicationcontext = new classpathxmlapplicationcontext("simple_spring_bean.xml");//源码入口 system.out.println("=============容器初始化=======end========"); system.out.println("=============获取person bean====start======="); person person = applicationcontext.getbean("person",person.class);//获取bean system.out.println("=============获取person bean====end=======,person类名="+person.getclass().getname()); system.out.println("=============注册关闭钩子，关闭容器（jvm shutdown）时触发钩子！================"); ((classpathxmlapplicationcontext)applicationcontext).registershutdownhook(); }} |
直接运行，结果如下：
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=============容器初始化======start=========log4j:warn no appenders could be found for logger (org.springframework.core.env.standardenvironment).log4j:warn please initialize the log4j system properly.[mybeanfactorypostprocessor工厂后处理器]beanfactorypostprocessor实现类构造器！！[mybeanfactorypostprocessor工厂后处理器]beanfactorypostprocessor.postprocessbeanfactory()获取bean定义后添加属性mobile=110这是beanpostprocessor实现类构造器！！这是instantiationawarebeanpostprocessoradapter实现类构造器！！instantiationawarebeanpostprocessor调用postprocessbeforeinstantiation方法[实例化bean之前调用 ]beanname=person[构造器] 调用person的构造器实例化instantiationawarebeanpostprocessor调用postprocesspropertyvalues方法 pvs=propertyvalues: length=2; bean property 'mobile'; bean property 'name',beanname=person[属性注入] mobile=110[属性注入] name=张三[接口beannameaware.setbeanname() ][接口beanfactoryaware.setbeanfactory() ]beanpostprocessor接口方法postprocessbeforeinitialization对属性进行更改！beanname=person[接口initializingbean.afterpropertiesset() ][init-method]调用<bean>的init-method属性指定的初始化方法beanpostprocessor接口方法postprocessafterinitialization对属性进行更改！beanname=personinstantiationawarebeanpostprocessor调用postprocessafterinitialization方法[实例化bean之后调用]beanname=person=============容器初始化=======end=====================获取person bean====start====================获取person bean====end=======,person类名=spring.ioc.person=============注册关闭钩子，关闭容器（jvm shutdown）时触发钩子！================[接口disposablebean.destroy() ][destroy-method]调用<bean>的destroy-method属性指定的销毁方法 |
总结流程：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/dennyzhangdd/p/7732273.html?utm_source=tuicool&utm_medium=referral
