yuyee
          

          

          

          
	
					
	
          
		
          
			IOC初始化和互相引用解決
		
          
		觀察IOC中容器初始化某個Bean順序，現先一個JAVABean類，看看控制臺輸出：package com.google.aop.exception.ioc;


          
import org.springframework.beans.BeansException;
          
          import org.springframework.beans.factory.BeanFactory;
          
          import org.springframework.beans.factory.BeanFactoryAware;
          
          import org.springframework.beans.factory.DisposableBean;
          
          import org.springframework.beans.factory.InitializingBean;
          
          import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
          
          import org.springframework.beans.factory.config.BeanPostProcessor;
          
          import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
          

          
          public class JAVABean implements InitializingBean, DisposableBean,
          
        BeanFactoryAware, BeanPostProcessor, BeanFactoryPostProcessor {
          
              // private MyBean myBean;
          
              //
          
              // public MyBean getMyBean() {
          
              // return myBean;
          
              // }
          
              //
          
              // public void setMyBean(MyBean myBean) {
          
              // System.out.println("JAVABean 中初始化 屬性myBean");
          
              // this.myBean = myBean;
          
              // }
          

          
              public JAVABean() {
          
        System.out.println(          "JAVABean 初始化成功");
          
    }
          

          
              public void init() {
          
        System.out.println(          "JAVABean init");
          
    }
          

          
    @Override
          
              public void afterPropertiesSet() throws Exception {
          
        System.out.println(          "JAVABean afterPropertiesSet");
          

          
    }
          

          
    @Override
          
              public void destroy() throws Exception {
          
        System.out.println(          "JAVABean destroy");
          

          
    }
          

          
    @Override
          
              public void setBeanFactory(BeanFactory arg0) throws BeansException {
          
        System.out.println(          "JAVABean setBeanFactory");
          

          
    }
          

          
    @Override
          
              public Object postProcessAfterInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessAfterInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public Object postProcessBeforeInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessBeforeInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessBeanFactory");
          

          
    }
          

          
}
          

          配置文件iocContext.xml
          

          <?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:p="http://www.springframework.org/schema/p"
          
    xmlns:tx          ="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
          
    xsi:schemaLocation          ="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
          
              http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop 
          
              http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
          
              http://www.springframework.org/schema/context 
          
              http://www.springframework.org/schema/context/spring-context-3.0.xsd">
          
              <bean id="javabean" class="com.google.aop.exception.ioc.JAVABean"
          
        init          -method="init">
          
                  <!-- <property name="myBean" ref="MyBean"></property> -->
          
              </bean>
          
              <!--
          
                  <bean id="MyBean" class="com.google.aop.exception.ioc.MyBean"
          
        init          -method="init"> <property name="javabean"
          
        ref          ="javabean"></property> </bean>
          
              -->
          
          </beans>
          

          控制臺輸出：
          

          

          JAVABean 初始化成功
          

          JAVABean setBeanFactory
          

          JAVABean afterPropertiesSet
          

          JAVABean init
          

          JAVABean postProcessBeanFactory
          

          

          可見是先實例化類->初始化屬性->設置創建這個類的beanFactory引用->調用afterPropertiesSet->調用init初始化方法->調用postProcessBeanFactory
          


          

          

          現在讓JAVABean和MyBean互相引用，看IOC是怎么解決這個問題
          

          

          package com.google.aop.exception.ioc;
          

          
          import org.springframework.beans.BeansException;
          
          import org.springframework.beans.factory.BeanFactory;
          
          import org.springframework.beans.factory.BeanFactoryAware;
          
          import org.springframework.beans.factory.DisposableBean;
          
          import org.springframework.beans.factory.InitializingBean;
          
          import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
          
          import org.springframework.beans.factory.config.BeanPostProcessor;
          
          import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
          

          
          public class JAVABean implements InitializingBean, DisposableBean,
          
        BeanFactoryAware, BeanPostProcessor, BeanFactoryPostProcessor {
          
              private MyBean myBean;
          

          
              public MyBean getMyBean() {
          
                  return myBean;
          
    }
          

          
              public void setMyBean(MyBean myBean) {
          
        System.out.println(          "JAVABean 中初始化 屬性myBean");
          
                  this.myBean = myBean;
          
    }
          

          
              public JAVABean() {
          
        System.out.println(          "JAVABean 初始化成功");
          
    }
          

          
              public void init() {
          
        System.out.println(          "JAVABean init");
          
    }
          

          
    @Override
          
              public void afterPropertiesSet() throws Exception {
          
        System.out.println(          "JAVABean afterPropertiesSet");
          

          
    }
          

          
    @Override
          
              public void destroy() throws Exception {
          
        System.out.println(          "JAVABean destroy");
          

          
    }
          

          
    @Override
          
              public void setBeanFactory(BeanFactory arg0) throws BeansException {
          
        System.out.println(          "JAVABean setBeanFactory");
          

          
    }
          

          
    @Override
          
              public Object postProcessAfterInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessAfterInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public Object postProcessBeforeInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessBeforeInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0)
          
                      throws BeansException {
          
        System.out.println(          "JAVABean postProcessBeanFactory");
          

          
    }
          

          
}
          

          

          MyBean:
          

          

          package com.google.aop.exception.ioc;
          

          
          import org.springframework.beans.BeansException;
          
          import org.springframework.beans.factory.BeanFactory;
          
          import org.springframework.beans.factory.BeanFactoryAware;
          
          import org.springframework.beans.factory.DisposableBean;
          
          import org.springframework.beans.factory.InitializingBean;
          
          import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
          
          import org.springframework.beans.factory.config.BeanPostProcessor;
          
          import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
          

          
          public class MyBean implements InitializingBean, DisposableBean,
          
        BeanFactoryAware, BeanPostProcessor, BeanFactoryPostProcessor {
          
              private JAVABean javabean;
          

          
              public MyBean() {
          
        System.out.println(          "MyBean 初始化成功");
          
    }
          

          
              public String get() {
          
                  return "Mybean";
          
    }
          

          
              public void init(){
          
        System.out.println(          "MyBean init");
          
    }
          
              public JAVABean getJavabean() {
          
                  return javabean;
          
    }
          

          
              public void setJavabean(JAVABean javabean) {
          
                  this.javabean = javabean;
          
        System.out.println(          "MyBean 屬性設置成功");
          
    }
          

          
    @Override
          
              public void afterPropertiesSet() throws Exception {
          
        System.out.println(          "MyBean  afterPropertiesSet");
          

          
    }
          

          
    @Override
          
              public void destroy() throws Exception {
          
        System.out.println(          "MyBean  destroy");
          

          
    }
          

          
    @Override
          
              public void setBeanFactory(BeanFactory arg0) throws BeansException {
          
        System.out.println(          "MyBean  setBeanFactory");
          
    }
          

          
    @Override
          
              public Object postProcessAfterInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "MyBean  postProcessAfterInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public Object postProcessBeforeInitialization(Object arg0, String arg1)
          
                      throws BeansException {
          
        System.out.println(          "MyBean  postProcessBeforeInitialization");
          
                  return null;
          
    }
          

          
    @Override
          
              public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0)
          
                      throws BeansException {
          
        System.out.println(          "MyBean  postProcessBeanFactory");
          

          
    }
          

          
}
          

          

          iocContext.xml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:p="http://www.springframework.org/schema/p"
          
    xmlns:tx          ="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
          
    xsi:schemaLocation          ="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
          
              http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop 
          
              http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
          
              http://www.springframework.org/schema/context 
          
              http://www.springframework.org/schema/context/spring-context-3.0.xsd">
          
              <bean id="javabean" class="com.google.aop.exception.ioc.JAVABean"
          
        init          -method="init">
          
                  <property name="myBean" ref="MyBean"></property>
          
              </bean>
          

          
              <bean id="MyBean" class="com.google.aop.exception.ioc.MyBean"
          
        init          -method="init">
          
                  <property name="javabean" ref="javabean"></property>
          
              </bean>
          

          
          </beans>
          

          

          控制臺輸出:
          

          

          JAVABean 初始化成功
          

          MyBean 初始化成功
          

          MyBean 屬性設置成功
          

          MyBean  setBeanFactory
          

          MyBean  afterPropertiesSet
          

          MyBean init
          

          JAVABean 中初始化 屬性myBean
          

          JAVABean setBeanFactory
          

          JAVABean afterPropertiesSet
          

          JAVABean init
          

          JAVABean postProcessBeanFactory
          

          MyBean  postProcessBeanFactory
          

          由結果可知，當IOC容器初始化JAVABean后進行屬性初始化，發現MyBean這類屬性還沒初始化，則先初始化Mybean類直到調用他的init方法，之后再回到JAVABean類初始化，將Mybean引用賦給JavaBean
          

          

          

          

          
 
		
          
			posted on 2010-11-10 16:27 羔羊 閱讀(417) 評論(0)  編輯  收藏  所屬分類: IOC 
		
          
	
          
	
	





          
	    
    

          

				
	


          



    



          
        
	




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