学步园

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