Spring(1)_Bean初始化

源码：

执行的代码

public static void main(String[] args) {
         ApplicationContext context=new ClassPathXmlApplicationContext("Beans.xml");
            Hello hello1=(Hello)context.getBean("hello");
            Hello hello2=(Hello)context.getBean("hello");
            // hello.getMessage();
            System.out.println(hello1==hello2);
    }

Beans.xml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"
    xmlns:context="http://www.springframework.org/schema/context"
     xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.1.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-4.1.xsd">
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
 
    <bean id="roleAspect" class="com.dy.spring.aop.aspect.RoleAspect"></bean>
    <aop:config>
         <aop:pointcut  id="roleServiced" expression="execution(public * com.dy.spring.aop.aspect.RoleService.saveMsg(..))" />
         <aop:aspect id="role" ref="roleAspect">
             <aop:before method="beforeSave" pointcut-ref="roleServiced"/>
             <aop:after method="afterSave" pointcut-ref="roleServiced"/>
             <aop:after-returning method="afterReturning" pointcut-ref="roleServiced"/>
             <aop:after-throwing method="afterThrowing" pointcut-ref="roleServiced"/>
         </aop:aspect>
    </aop:config>
 
    <bean id="roleService" class="com.dy.spring.aop.aspect.RoleService"></bean>
<!--
    <bean id="student" class="com.dy.spring.ioc.Student" default-lazy-init="true">
     -->
     <bean id="student" class="com.dy.spring.ioc.Student">
        <property name="name" value="jason"></property>
    </bean>
 
    <bean id="hello" class="com.dy.spring.ioc.Hello" scope="prototype">
           <property name="message" value="这是一个测试"/>
    </bean>
</beans>

1.产生beanFactory

ApplicationContext context=new ClassPathXmlApplicationContext("Beans.xml");之后，
通过new DefaultListableBeanFactory(getInternalParentBeanFactory());产生beanfactory

2.beanfactory加载配置信息

new 对象beanDefinitionReader

XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);

loadBeanDefinitions(beanDefinitionReader);读取的配置信息load到这个对象中

XmlBeanDefinitionReader加载配置文件Beans.xml

3.初始化Bean

bean初始化具体的方法finishBeanFactoryInitialization

通过ctor.newInstance(args) 初始化bean