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Spring Bean 初始化过程

springjavabeanweb 
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Life类
Java代码 复制代码 收藏代码
  1. package com.open.bean;   
  2. import org.springframework.beans.BeansException;   
  3. import org.springframework.beans.factory.BeanFactory;   
  4. import org.springframework.beans.factory.BeanFactoryAware;   
  5. import org.springframework.beans.factory.BeanNameAware;   
  6. import org.springframework.beans.factory.DisposableBean;   
  7. import org.springframework.beans.factory.InitializingBean;   
  8. public class Life implements BeanFactoryAware, BeanNameAware,   
  9.         InitializingBean, DisposableBean {   
  10.     private String msg;   
  11.     public Life() {   
  12.         System.out.println("msg="+msg);   
  13.         System.out.println("构造函数");   
  14.     }   
  15.     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {   
  16.         System.out.println("setBeanFactory");   
  17.     }   
  18.     public void setBeanName(String name) {   
  19.         System.out.println("setBeanName");   
  20.     }   
  21.     public void init() {   
  22.         System.out.println("初始化");   
  23.     }   
  24.     public Object postProcessBeforeInitialization(Object bean, String beanName)   
  25.             throws BeansException {   
  26.         System.out.println("postProcessBeforeInitialization");   
  27.         return null;   
  28.     }   
  29.     public Object postProcessAfterInitialization(Object bean, String beanName)   
  30.             throws BeansException {   
  31.         System.out.println("postProcessAfterInitialization");   
  32.         return null;   
  33.     }   
  34.     public void afterPropertiesSet() throws Exception {   
  35.         System.out.println("afterPropertiesSet");   
  36.     }   
  37.     public void destroy() throws Exception {   
  38.         System.out.println("destroy");   
  39.     }   
  40.     public String getMsg() {   
  41.         return msg;   
  42.     }   
  43.     public void setMsg(String msg) {   
  44.         this.msg = msg;   
  45.     }   
  46. }  
package com.open.bean;
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 Life implements BeanFactoryAware, BeanNameAware,
        InitializingBean, DisposableBean {
    private String msg;
    public Life() {
        System.out.println("msg="+msg);
        System.out.println("构造函数");
    }
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        System.out.println("setBeanFactory");
    }
    public void setBeanName(String name) {
        System.out.println("setBeanName");
    }
    public void init() {
        System.out.println("初始化");
    }
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return null;
    }
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return null;
    }
    public void afterPropertiesSet() throws Exception {
        System.out.println("afterPropertiesSet");
    }
    public void destroy() throws Exception {
        System.out.println("destroy");
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

 

 

BeanPostProcessorImp类

Java代码 复制代码 收藏代码
  1. package com.open.bean;   
  2. import org.springframework.beans.BeansException;   
  3. import org.springframework.beans.factory.config.BeanPostProcessor;   
  4. public class BeanPostProcessorImp implements BeanPostProcessor {   
  5.     public Object postProcessBeforeInitialization(Object bean, String beanName)   
  6.             throws BeansException {   
  7.         System.out.println("postProcessBeforeInitialization");   
  8.         return bean;   
  9.     }   
  10.     public Object postProcessAfterInitialization(Object bean, String beanName)   
  11.             throws BeansException {   
  12.         System.out.println("postProcessAfterInitialization");   
  13.         return bean;   
  14.     }   
  15. }  
package com.open.bean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
public class BeanPostProcessorImp implements BeanPostProcessor {
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return bean;
    }
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return bean;
    }
}

 

 

BeanCounter类

Java代码 复制代码 收藏代码
  1. package com.open.bean;   
  2. import org.springframework.beans.BeansException;   
  3. import org.springframework.beans.factory.config.BeanFactoryPostProcessor;   
  4. import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;   
  5. public class BeanCounter implements BeanFactoryPostProcessor {   
  6.     public void postProcessBeanFactory(   
  7.             ConfigurableListableBeanFactory beanFactory) throws BeansException {   
  8.         System.out.println("类的数量＝"+beanFactory.getBeanDefinitionCount());   
  9.     }   
  10. }  
package com.open.bean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class BeanCounter implements BeanFactoryPostProcessor {
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("类的数量＝"+beanFactory.getBeanDefinitionCount());
    }
}

  

 

 

 

bean.xml

Java代码 复制代码 收藏代码
  1. <?xml version="1.0" encoding="UTF-8"?>   
  2. <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  
  3.     "http://www.springframework.org/dtd/spring-beans.dtd">   
  4. <beans>   
  5.     <bean id="life" name="life_name" class="com.open.bean.Life"    
  6.         init-method="init">   
  7.         <property name="msg" value="lifexxxx"/>   
  8.     </bean>       
  9.     <bean id="processor" class="com.open.bean.BeanPostProcessorImp"/>   
  10.     <bean id="counter" class="com.open.bean.BeanCounter"/>   
  11. </beans>  
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
    "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="life" name="life_name" class="com.open.bean.Life" 
        init-method="init">
        <property name="msg" value="lifexxxx"/>
    </bean>    
    <bean id="processor" class="com.open.bean.BeanPostProcessorImp"/>
    <bean id="counter" class="com.open.bean.BeanCounter"/>
</beans>

 

 

 

测试类

 

Java代码 复制代码 收藏代码
  1. package com.open.bean;   
  2. import org.springframework.context.support.ClassPathXmlApplicationContext;   
  3. public class Test {   
  4.     public static void main(String[] args) {   
  5.         ClassPathXmlApplicationContext cx=   
  6.             new ClassPathXmlApplicationContext("bean.xml");   
  7.          Life life=(Life)cx.getBean("life");        
  8.     }   
  9. }      
package com.open.bean;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext cx=
            new ClassPathXmlApplicationContext("bean.xml");
         Life life=(Life)cx.getBean("life");     
    }
}

 

 

输出结果

 

类的数量＝3
msg=null
构造函数
setBeanName
setBeanFactory
postProcessBeforeInitialization
afterPropertiesSet
初始化
postProcessAfterInitialization

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