Spring(三)
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2024-01-07 21:11:46
Spring bean的生命周期 1.需要的实体类 2.需要的InstantiationAwareBeanPostProcessorAdapter 3.需要的BeanPostProcessor 4.需要的BeanFactoryPostProcessor 5.需要的xml文件配置 6.需要的测试代码 ......
spring bean的生命周期
1.需要的实体类
ackage com.xdf.bean; import org.springframework.beans.beansexception; import org.springframework.beans.factory.*; /** * 学生的实体类 * * aware本意就是察觉,感觉 * 01.实现了beannameaware,就是让student类感觉到自己在容器中的id或者是name * 02.实现了beanfactoryaware,就是让student类感觉到自己在容器中所属的bean工厂 * 03.实现了initializingbean,就是为了执行初始化之后的操作 ,但是对sprin*生了依赖 * 后续使用反射机制 init-method 来消除对spring的依赖 * 04.实现了disposablebean,就是为了执行bean销毁之后的操作 ,但是对sprin*生了依赖 * 后续使用反射机制 destroy-method 来消除对spring的依赖 */ public class student implements beannameaware,beanfactoryaware,initializingbean,disposablebean{ private int age; //年龄 private string stuname; //姓名 private string beanname; //bean在容器中的id或者name private beanfactory beanfactory; //bean所在的工厂 public student() { system.out.println("===student类中的无参构造==="); } //beannameaware接口中的setbeanname() public void setbeanname(string beanname) { system.out.println("===执行了beannameaware接口中的setbeanname()==="); this.beanname=beanname; } //beanfactoryaware中的setbeanfactory() public void setbeanfactory(beanfactory beanfactory) throws beansexception { system.out.println("===执行了beanfactoryaware中的setbeanfactory()==="); this.beanfactory=beanfactory; } public void initmethod(){ system.out.println("===student类中的initmethod()==="); } public void afterpropertiesset() throws exception { system.out.println("===initializingbean中的afterpropertiesset()==="); } public void mydestroy(){ system.out.println("===student类中的mydestroy()==="); } public void destroy() throws exception { system.out.println("===disposablebean中的destroy()==="); } public int getage() { return age; } public void setage(int age) { system.out.println("===student类中给属性赋值 setage()==="); this.age = age; } public string getstuname() { return stuname; } public void setstuname(string stuname) { system.out.println("===student类中给属性赋值 setstuname()==="); this.stuname = stuname; } public string getbeanname() { return beanname; } public beanfactory getbeanfactory() { return beanfactory; } @override public string tostring() { return "student{" + "age=" + age + ", stuname='" + stuname + '\'' + '}'; }
2.需要的instantiationawarebeanpostprocessoradapter
package com.xdf.bean; import org.springframework.beans.beansexception; import org.springframework.beans.propertyvalues; import org.springframework.beans.factory.config.instantiationawarebeanpostprocessoradapter; import java.beans.propertydescriptor; /** * bean实例化之前 和之后 */ public class myinitawarebeanpostadpater extends instantiationawarebeanpostprocessoradapter{ public myinitawarebeanpostadpater(){ system.out.println("*****myinitawarebeanpostadpater的无参构造*****"); } //在实例化bean之前调用 @override public object postprocessbeforeinstantiation(class<?> beanclass, string beanname) throws beansexception { system.out.println("*****执行了myinitawarebeanpostadpater的 postprocessbeforeinstantiation *****"); return null; //底层返回的就是null } //在实例化bean之后调用 @override public object postprocessafterinitialization(object bean, string beanname) throws beansexception { system.out.println("*****执行了myinitawarebeanpostadpater的 postprocessafterinitialization *****"); return bean; } @override public propertyvalues postprocesspropertyvalues(propertyvalues pvs, propertydescriptor[] pds, object bean, string beanname) throws beansexception { system.out.println("*****执行了myinitawarebeanpostadpater的 postprocesspropertyvalues *****"); return pvs; } }
3.需要的beanpostprocessor
package com.xdf.bean; import org.springframework.beans.beansexception; import org.springframework.beans.factory.config.beanpostprocessor; /** * processor 本意是加工 处理的意思! * * 实现了beanpostprocessor */ public class mybeanpostprocessor implements beanpostprocessor { public mybeanpostprocessor(){ system.out.println("===mybeanpostprocessor的无参构造方法 ==="); } public object postprocessbeforeinitialization(object bean, string beanname) throws beansexception { system.out.println("===执行了beanpostprocessor中的 postprocess ==before==initialization ==="); return bean; } public object postprocessafterinitialization(object bean, string beanname) throws beansexception { system.out.println("===执行了beanpostprocessor中的 postprocess ==after==initialization ==="); return bean; } }
4.需要的beanfactorypostprocessor
package com.xdf.bean; 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.beanpostprocessor; import org.springframework.beans.factory.config.configurablelistablebeanfactory; /** * processor 本意是加工 处理的意思! * * 实现了beanfactorypostprocessor 工厂的后处理器 */ public class mybeanfactorypostprocessor implements beanfactorypostprocessor { public mybeanfactorypostprocessor(){ system.out.println("===mybeanfactorypostprocessor的无参构造方法 ==="); } public void postprocessbeanfactory(configurablelistablebeanfactory beanfactory) throws beansexception { system.out.println("===mybeanfactorypostprocessor的postprocessbeanfactory ==="); beandefinition beandefinition = beanfactory.getbeandefinition("student"); beandefinition.getpropertyvalues().addpropertyvalue("stuname","小白"); } }
5.需要的xml文件配置
<?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:context="http://www.springframework.org/schema/context" 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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!--配置mybeanpostprocessor 容器级别的 当前xml文件中所有的bean都会执行mybeanpostprocessor中的方法--> <bean class="com.xdf.bean.mybeanpostprocessor"/> <!--配置mybeanfactorypostprocessor 容器级别的 同上--> <bean class="com.xdf.bean.mybeanfactorypostprocessor"/> <!--配置myinitawarebeanpostadpater 容器级别的 同上--> <bean class="com.xdf.bean.myinitawarebeanpostadpater"/> <!-- 配置student 的实体对象--> <bean id="student" class="com.xdf.bean.student" init-method="initmethod" destroy-method="mydestroy"> <property name="age" value="20"/> <property name="stuname" value="小黑"/> </bean> </beans>
6.需要的测试代码
/** * 测试bean生命周期 */ public class lifecycle { public static void main(string[] args) { applicationcontext context=new classpathxmlapplicationcontext("spring.xml"); student student= context.getbean("student", student.class); system.out.println(student); ((classpathxmlapplicationcontext)context).close(); //关闭容器 } }
未完待续!!!
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