Spring Bean 初始化进程

Java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;
    }
}

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BeanPostProcessorImp类

Java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;
    }
}

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BeanCounter类

Java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());
    }
}

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bean.xml

Java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>

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测试类

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Java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");     
    }
}    

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输出结果

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