Spring版本

5.2.5.RELEASE

参考

《芋道源码》

Demo

从前面的众多源码解读章节，其实我们大致了解了bean的生命周期，下面通过一个具体的例子，来加深对于这一块的理解。

LifeCycleBean

public class LifeCycleBean implements BeanPostProcessor, BeanNameAware, BeanClassLoaderAware, BeanFactoryAware, InitializingBean, DisposableBean {

    private String name;



    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        System.out.println("setBeanClassLoader");
    }

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

    @Override
    public void setBeanName(String name) {
        System.out.println("setBeanName");
    }

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

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

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

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

    public LifeCycleBean() {
        System.out.println("constructionMethod");
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        System.out.println("set name property");
        this.name = name;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return bean;
    }
}

spring.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="lifeCycleBean" class="com.kungyu.custom.element.LifeCycleBean" destroy-method="destroyMethod" init-method="initMethod">
        <property name="name" value="name"/>
    </bean>
</bean>

测试

public class Test {
    public static void main(String[] args) throws ClassNotFoundException {

        ClassPathResource resource = new ClassPathResource("spring.xml");
        DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
        factory.addBeanPostProcessor(new LifeCycleBean());
        XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(factory);
        reader.loadBeanDefinitions(resource);

        LifeCycleBean lifeCycleBean = (LifeCycleBean) factory.getBean("lifeCycleBean");
        lifeCycleBean.normalMethod();

        factory.destroySingleton("lifeCycleBean");

    }
}

结果

结果

总结

bean生命周期.png