spring生命周期管理-初始化与销毁

spring生命周期管理只涉及单例对象的管理

一初始化与销毁

1.通过设置bean的init-mothed属性指定初始化的方法,他的限制是方法无法接受任何参数,方法可以为static

2.实现InitializingBean接口的afterPropertiesSet()方法

3.最好的方法是在afterProptertiesSet()中调用自定义初始化方法

4.销毁单例对象可以通过指定bean的destroy-method属性,指定销毁时执行的方法名

5.销毁单例对象可以通过实现DisposableBean的destroy实现

6.销毁方法的触发是通过生成该单例对象的BeanFactory的destroySingletons方法的执行而触发

7.通过指定 ShutdownHook可以指定一个线程来执行BeanFactory的destroySingletons方法

8.如果同时指定两种初始化和销毁方法,初始化接口方法首先运行,参数话初始化方法后运行;销毁时,接口中的销毁方法首先运行,参数指定的销毁方法后运行

二代码1beanpackage study.spring;import org.springframework.beans.factory.InitializingBean;import org.springframework.beans.factory.DisposableBean;public class ContextTest implements InitializingBean,DisposableBean { private String content; public void init(){ System.out.println("mothed init run."); } public void afterPropertiesSet() throws java.lang.Exception{ if (content== null) content="hello"; System.out.println("afterPropertiesSet run."); } public String getContent(){ return content; } public void setContent(String content){ this.content = content; } public void dispose(){ System.out.println("mothed despose run."); } public void destroy(){ content = null; System.out.println("destroy run."); } }2测试程序package study.spring;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.FileSystemResource;import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;public class SimpleInject{ public static void main(String[] args){ ConfigurableListableBeanFactory beanFactory3 = new XmlBeanFactory(new FileSystemResource("./spring_xml/beans_teacher.xml")); ConfigurableListableBeanFactory beanFactory1 = new XmlBeanFactory(new FileSystemResource("./spring_xml/beans.xml"),beanFactory3); ConfigurableListableBeanFactory beanFactory2 = new XmlBeanFactory(new FileSystemResource("./spring_xml/beans_address.xml")); Runtime.getRuntime().addShutdownHook( new Thread(new ShutdownHook(beanFactory2))); Student student1 = (Student)beanFactory1.getBean("student"); ContextTest ct = (ContextTest)beanFactory2.getBean("context"); System.out.println(ct.getContent()); }}class ShutdownHook implements java.lang.Runnable{ private ConfigurableListableBeanFactory cbf; public ShutdownHook(ConfigurableListableBeanFactory cbf){ this.cbf = cbf; } public void run(){ cbf.destroySingletons(); } }3配置文件</bean><bean id="context" class="study.spring.ContextTest" init-method="init" destroy-method="dispose"></bean>