Spring3之 bean 定做bean特性

Spring3之 bean 定制bean特性

Customizing?the?nature?of?a?bean定制bean特性

Spring提供了几个标志接口（marker?interface），这些接口用来改变容器中bean的行为；它们包括InitializingBean和DisposableBean。实现这两个接口的bean在初始化和析构时容器会调用前者的afterPropertiesSet()方法，以及后者的destroy()方法。

com.spring305.test.customBean.po.ImplCustom.java

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import org.springframework.beans.factory.DisposableBean;import org.springframework.beans.factory.InitializingBean;public class ImplCustom implements InitializingBean,DisposableBean {public ImplCustom(){System.out.println("this is "+ImplCustom.class+"`s constractor method");}@Override   //InitializingBeanpublic void afterPropertiesSet() throws Exception {System.out.println("in "+ ImplCustom.class+" afterPropertiesSet() method");}@Override  //DisposableBeanpublic void destroy() throws Exception {System.out.println("in "+ ImplCustom.class+" destroy() method");}}

?xml中加入 bean的定义

<bean id="implCustom" style="margin-top: 0pt; margin-bottom: 0pt;">?测试:
@Testpublic void test(){ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[]{"testCustombean.xml"});ImplCustom impl = ctx.getBean("implCustom",ImplCustom.class);}
?同时也可以在xml中用init-method,destroy-method来指定初始化回调与析构回调,这样就不用实现接口了
com.spring305.test.customBean.po.CustomBean.java
public class CustomBean {public CustomBean(){System.out.println("this is "+CustomBean.class+"`s constractor method");}public void init() {System.out.println("in "+ CustomBean.class+" init() method");}public void destroy()  {System.out.println("in "+ CustomBean.class+" destroy() method");}}
?xml中加入
<bean id="customBean" init-method="init" destroy-method="destroy"></bean>
?测试:
@Testpublic void testNoImpliment(){AbstractApplicationContext  ctx = new ClassPathXmlApplicationContext(new String[]{"testCustombean.xml"});CustomBean impl = ctx.getBean("customBean",CustomBean.class);ctx.registerShutdownHook();}
?最后一句ctx.registerShutdownHook();是2.5文档中定义的一个关闭spring IOC容器的方法.
如上还可以在beans标签下为该标签下所有bean标签来定义初始化回调方法:default-init-method="init"
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