【Spring】依賴注入加載順序

時間 2019-11-20

原文原文鏈接

1、Spring依賴注入depents-on參數

depents-on是指指定Bean初始化及銷燬時的順序，使用depends-on屬性指定的是Bean要先初始化完畢後才初始化當前Bean,因爲只有Singleton Bean能被Spring管理銷燬，因此當指定的Bean都是singleton時，使用depends-on屬性指定的Bean要在指定的Bean以後銷燬java

一、須要實體類以及配置文件測試實例日誌信息

 1 package com.slp.spring.learn.helloworld.di;
 2 
 3 import java.io.File;
 4 import java.io.FileNotFoundException;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 /**
 8  * ResourceBean從配置文件中配置文件位置，而後定義初始化方法init中打開指定的文件，而後獲取文件流；最後定義銷燬方法destroy用於在應用程序關閉時調用該方法關閉掉文件流
 9  * @author sangliping
10  *
11  */
12 public class ResourceBean {
13 
14     private FileOutputStream fos;
15     private File file;
16     public void init(){
17         System.out.println("ResourceBean:=============初始化");
18         //加載資源，在此只是演示
19         System.out.println("ResourceBean:==============加載資源，執行一些與操做");
20         try {
21             fos=new FileOutputStream(file);
22         } catch (FileNotFoundException e) {
23             // TODO Auto-generated catch block
24             e.printStackTrace();
25         }
26     }
27     
28     public void destory(){
29         System.out.println("ResourceBean:============銷燬");
30         //釋放資源
31         System.out.println("ResourceBean:===========釋放資源，執行一些清理操做");
32         try {
33             fos.close();
34         } catch (IOException e) {
35             // TODO Auto-generated catch block
36             e.printStackTrace();
37         }
38     }
39 
40     public FileOutputStream getFos() {
41         return fos;
42     }
43 
44     public void setFos(FileOutputStream fos) {
45         this.fos = fos;
46     }
47 
48     public File getFile() {
49         return file;
50     }
51 
52     public void setFile(File file) {
53         this.file = file;
54     }
55     
56 }

package com.slp.spring.learn.helloworld.di;

import java.io.IOException;
/**
 * DependentBean中會注入ResourceBean，並從ResourceBean中獲取文件流寫入內容；定義初始化方法init用來定義一些初始化操做並向文件中輸出文件頭信息；最後定義銷燬方法用於在關閉應用程序時想文件中輸出文件尾信息。
 * @author sangliping
 *
 */
public class DependentBean {
    ResourceBean resourceBean;

    public void write(String ss) throws IOException {
        System.out.println("DependentBean:=======寫資源");
        resourceBean.getFos().write(ss.getBytes());
    }

    // 初始化方法
    public void init() throws IOException {
        System.out.println("DependentBean:=======初始化");
        resourceBean.getFos().write("DependentBean:=======初始化=====".getBytes());
    }

    // 銷燬方法
    public void destroy() throws IOException {
        System.out.println("DependentBean:=======銷燬");
        // 在銷燬以前須要往文件中寫銷燬內容
        resourceBean.getFos().write("DependentBean:=======銷燬=====".getBytes());
    }

    public void setResourceBean(ResourceBean resourceBean) {
        this.resourceBean = resourceBean;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="  
http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
http://www.springframework.org/schema/context                http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <bean id="resourceBean" class="com.slp.spring.learn.helloworld.di.ResourceBean" init-method="init" destroy-method="destory">
        <property name="file" value="D://test.txt"></property><!-- Spring容器能夠自動把字符串轉換爲java.io.File -->
    </bean>
    <bean id="dependentBean" class="com.slp.spring.learn.helloworld.di.DependentBean" init-method="init" destroy-method="destroy" depends-on="resourceBean">
        <property name="resourceBean" ref="resourceBean"></property>
    </bean>
</beans>

package com.slp.spring.learn.helloworld.di;

import java.io.IOException;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/*2017-07-13 10:28:39,793 DEBUG main org.springframework.core.env.MutablePropertySources.addLast(MutablePropertySources.java:107) Adding [systemProperties] PropertySource with lowest search precedence
2017-07-13 10:28:39,884 DEBUG main org.springframework.core.env.MutablePropertySources.addLast(MutablePropertySources.java:107) Adding [systemEnvironment] PropertySource with lowest search precedence
2017-07-13 10:28:39,885 DEBUG main org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:126) Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment]
2017-07-13 10:28:39,918 INFO  main org.springframework.context.support.AbstractApplicationContext.prepareRefresh(AbstractApplicationContext.java:510) Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7c30a502: startup date [Thu Jul 13 10:28:39 CST 2017]; root of context hierarchy
2017-07-13 10:28:40,080 DEBUG main org.springframework.core.env.MutablePropertySources.addLast(MutablePropertySources.java:107) Adding [systemProperties] PropertySource with lowest search precedence
2017-07-13 10:28:40,081 DEBUG main org.springframework.core.env.MutablePropertySources.addLast(MutablePropertySources.java:107) Adding [systemEnvironment] PropertySource with lowest search precedence
2017-07-13 10:28:40,086 DEBUG main org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:126) Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment]
2017-07-13 10:28:40,196 INFO  main org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:315) Loading XML bean definitions from class path resource [di/depent-on.xml]
2017-07-13 10:28:40,201 DEBUG main org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:72) Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl]
2017-07-13 10:28:40,382 DEBUG main org.springframework.beans.factory.xml.PluggableSchemaResolver.getSchemaMappings(PluggableSchemaResolver.java:140) Loading schema mappings from [META-INF/spring.schemas]
2017-07-13 10:28:40,394 DEBUG main org.springframework.beans.factory.xml.PluggableSchemaResolver.getSchemaMappings(PluggableSchemaResolver.java:146) Loaded schema mappings: {http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd=org/springframework/oxm/config/spring-oxm-3.0.xsd, http://www.springframework.org/schema/util/spring-util.xsd=org/springframework/beans/factory/xml/spring-util-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-3.2.xsd=org/springframework/ejb/config/spring-jee-3.2.xsd, http://www.springframework.org/schema/jms/spring-jms-3.0.xsd=org/springframework/jms/config/spring-jms-3.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd=org/springframework/web/servlet/config/spring-mvc-3.1.xsd, http://www.springframework.org/schema/task/spring-task.xsd=org/springframework/scheduling/config/spring-task-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-3.1.xsd=org/springframework/beans/factory/xml/spring-beans-3.1.xsd, http://www.springframework.org/schema/cache/spring-cache.xsd=org/springframework/cache/config/spring-cache-3.2.xsd, http://www.springframework.org/schema/aop/spring-aop-3.0.xsd=org/springframework/aop/config/spring-aop-3.0.xsd, http://www.springframework.org/schema/task/spring-task-3.1.xsd=org/springframework/scheduling/config/spring-task-3.1.xsd, http://www.springframework.org/schema/aop/spring-aop-2.0.xsd=org/springframework/aop/config/spring-aop-2.0.xsd, http://www.springframework.org/schema/oxm/spring-oxm.xsd=org/springframework/oxm/config/spring-oxm-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-2.5.xsd=org/springframework/beans/factory/xml/spring-tool-2.5.xsd, http://www.springframework.org/schema/beans/spring-beans.xsd=org/springframework/beans/factory/xml/spring-beans-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-2.5.xsd=org/springframework/ejb/config/spring-jee-2.5.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd=org/springframework/jdbc/config/spring-jdbc-3.1.xsd, http://www.springframework.org/schema/tool/spring-tool-3.1.xsd=org/springframework/beans/factory/xml/spring-tool-3.1.xsd, http://www.springframework.org/schema/jee/spring-jee-3.1.xsd=org/springframework/ejb/config/spring-jee-3.1.xsd, http://www.springframework.org/schema/aop/spring-aop.xsd=org/springframework/aop/config/spring-aop-3.2.xsd, http://www.springframework.org/schema/tx/spring-tx-3.2.xsd=org/springframework/transaction/config/spring-tx-3.2.xsd, http://www.springframework.org/schema/context/spring-context-3.2.xsd=org/springframework/context/config/spring-context-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-2.0.xsd=org/springframework/beans/factory/xml/spring-beans-2.0.xsd, http://www.springframework.org/schema/util/spring-util-3.2.xsd=org/springframework/beans/factory/xml/spring-util-3.2.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd=org/springframework/web/servlet/config/spring-mvc-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-3.2.xsd=org/springframework/scripting/config/spring-lang-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-3.0.xsd=org/springframework/beans/factory/xml/spring-beans-3.0.xsd, http://www.springframework.org/schema/cache/spring-cache-3.2.xsd=org/springframework/cache/config/spring-cache-3.2.xsd, http://www.springframework.org/schema/task/spring-task-3.0.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd, http://www.springframework.org/schema/oxm/spring-oxm-3.2.xsd=org/springframework/oxm/config/spring-oxm-3.2.xsd, http://www.springframework.org/schema/tx/spring-tx-2.5.xsd=org/springframework/transaction/config/spring-tx-2.5.xsd, http://www.springframework.org/schema/context/spring-context-2.5.xsd=org/springframework/context/config/spring-context-2.5.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd=org/springframework/jdbc/config/spring-jdbc-3.0.xsd, http://www.springframework.org/schema/jms/spring-jms-3.2.xsd=org/springframework/jms/config/spring-jms-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-3.0.xsd=org/springframework/beans/factory/xml/spring-tool-3.0.xsd, http://www.springframework.org/schema/tx/spring-tx.xsd=org/springframework/transaction/config/spring-tx-3.2.xsd, http://www.springframework.org/schema/lang/spring-lang.xsd=org/springframework/scripting/config/spring-lang-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-2.0.xsd=org/springframework/beans/factory/xml/spring-tool-2.0.xsd, http://www.springframework.org/schema/util/spring-util-2.5.xsd=org/springframework/beans/factory/xml/spring-util-2.5.xsd, http://www.springframework.org/schema/lang/spring-lang-2.5.xsd=org/springframework/scripting/config/spring-lang-2.5.xsd, http://www.springframework.org/schema/aop/spring-aop-3.2.xsd=org/springframework/aop/config/spring-aop-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-3.0.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd, http://www.springframework.org/schema/tx/spring-tx-3.1.xsd=org/springframework/transaction/config/spring-tx-3.1.xsd, http://www.springframework.org/schema/jee/spring-jee-2.0.xsd=org/springframework/ejb/config/spring-jee-2.0.xsd, http://www.springframework.org/schema/context/spring-context-3.1.xsd=org/springframework/context/config/spring-context-3.1.xsd, http://www.springframework.org/schema/util/spring-util-3.1.xsd=org/springframework/beans/factory/xml/spring-util-3.1.xsd, http://www.springframework.org/schema/lang/spring-lang-3.1.xsd=org/springframework/scripting/config/spring-lang-3.1.xsd, http://www.springframework.org/schema/cache/spring-cache-3.1.xsd=org/springframework/cache/config/spring-cache-3.1.xsd, http://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee.xsd=org/springframework/ejb/config/spring-jee-3.2.xsd, http://www.springframework.org/schema/jms/spring-jms-2.5.xsd=org/springframework/jms/config/spring-jms-2.5.xsd, http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd=org/springframework/oxm/config/spring-oxm-3.1.xsd, http://www.springframework.org/schema/jms/spring-jms.xsd=org/springframework/jms/config/spring-jms-3.2.xsd, http://www.springframework.org/schema/aop/spring-aop-2.5.xsd=org/springframework/aop/config/spring-aop-2.5.xsd, http://www.springframework.org/schema/mvc/spring-mvc.xsd=org/springframework/web/servlet/config/spring-mvc-3.2.xsd, http://www.springframework.org/schema/jms/spring-jms-3.1.xsd=org/springframework/jms/config/spring-jms-3.1.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd=org/springframework/web/servlet/config/spring-mvc-3.2.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc.xsd=org/springframework/jdbc/config/spring-jdbc-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-3.2.xsd=org/springframework/beans/factory/xml/spring-beans-3.2.xsd, http://www.springframework.org/schema/tx/spring-tx-2.0.xsd=org/springframework/transaction/config/spring-tx-2.0.xsd, http://www.springframework.org/schema/aop/spring-aop-3.1.xsd=org/springframework/aop/config/spring-aop-3.1.xsd, http://www.springframework.org/schema/task/spring-task-3.2.xsd=org/springframework/scheduling/config/spring-task-3.2.xsd, http://www.springframework.org/schema/tx/spring-tx-3.0.xsd=org/springframework/transaction/config/spring-tx-3.0.xsd, http://www.springframework.org/schema/context/spring-context-3.0.xsd=org/springframework/context/config/spring-context-3.0.xsd, http://www.springframework.org/schema/tool/spring-tool.xsd=org/springframework/beans/factory/xml/spring-tool-3.2.xsd, http://www.springframework.org/schema/util/spring-util-3.0.xsd=org/springframework/beans/factory/xml/spring-util-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-3.0.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd, http://www.springframework.org/schema/util/spring-util-2.0.xsd=org/springframework/beans/factory/xml/spring-util-2.0.xsd, http://www.springframework.org/schema/lang/spring-lang-2.0.xsd=org/springframework/scripting/config/spring-lang-2.0.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd=org/springframework/jdbc/config/spring-jdbc-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-3.2.xsd=org/springframework/beans/factory/xml/spring-tool-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-2.5.xsd=org/springframework/beans/factory/xml/spring-beans-2.5.xsd}
2017-07-13 10:28:40,398 DEBUG main org.springframework.beans.factory.xml.PluggableSchemaResolver.resolveEntity(PluggableSchemaResolver.java:118) Found XML schema [http://www.springframework.org/schema/beans/spring-beans-3.0.xsd] in classpath: org/springframework/beans/factory/xml/spring-beans-3.0.xsd
2017-07-13 10:28:40,633 DEBUG main org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:106) Loading bean definitions
2017-07-13 10:28:40,698 DEBUG main org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216) Loaded 2 bean definitions from location pattern [di/depent-on.xml]
2017-07-13 10:28:40,700 DEBUG main org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540) Bean factory for org.springframework.context.support.ClassPathXmlApplicationContext@7c30a502: org.springframework.beans.factory.support.DefaultListableBeanFactory@1e6d1014: defining beans [resourceBean,dependentBean]; root of factory hierarchy
2017-07-13 10:28:40,763 DEBUG main org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:807) Unable to locate MessageSource with name 'messageSource': using default [org.springframework.context.support.DelegatingMessageSource@7a187f14]
2017-07-13 10:28:40,817 DEBUG main org.springframework.context.support.AbstractApplicationContext.initApplicationEventMulticaster(AbstractApplicationContext.java:831) Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.springframework.context.event.SimpleApplicationEventMulticaster@27808f31]
2017-07-13 10:28:40,818 INFO  main org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:603) Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1e6d1014: defining beans [resourceBean,dependentBean]; root of factory hierarchy
2017-07-13 10:28:40,820 DEBUG main org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:215) Creating shared instance of singleton bean 'resourceBean'
2017-07-13 10:28:40,821 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:432) Creating instance of bean 'resourceBean'
2017-07-13 10:28:40,844 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:506) Eagerly caching bean 'resourceBean' to allow for resolving potential circular references
2017-07-13 10:28:40,936 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1612) Invoking init method  'init' on bean with name 'resourceBean'
ResourceBean:=============初始化
ResourceBean:==============加載資源，執行一些與操做
2017-07-13 10:28:40,966 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:460) Finished creating instance of bean 'resourceBean'
2017-07-13 10:28:40,967 DEBUG main org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246) Returning cached instance of singleton bean 'resourceBean'
2017-07-13 10:28:40,972 DEBUG main org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:215) Creating shared instance of singleton bean 'dependentBean'
2017-07-13 10:28:40,972 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:432) Creating instance of bean 'dependentBean'
2017-07-13 10:28:40,974 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:506) Eagerly caching bean 'dependentBean' to allow for resolving potential circular references
2017-07-13 10:28:40,977 DEBUG main org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246) Returning cached instance of singleton bean 'resourceBean'
2017-07-13 10:28:40,980 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1612) Invoking init method  'init' on bean with name 'dependentBean'
DependentBean:=======初始化
2017-07-13 10:28:40,982 DEBUG main org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:460) Finished creating instance of bean 'dependentBean'
2017-07-13 10:28:40,984 DEBUG main org.springframework.context.support.AbstractApplicationContext.initLifecycleProcessor(AbstractApplicationContext.java:858) Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@b3d7190]
2017-07-13 10:28:40,985 DEBUG main org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246) Returning cached instance of singleton bean 'lifecycleProcessor'
2017-07-13 10:28:40,995 DEBUG main org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:81) Searching for key 'spring.liveBeansView.mbeanDomain' in [systemProperties]
2017-07-13 10:28:41,023 DEBUG main org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:81) Searching for key 'spring.liveBeansView.mbeanDomain' in [systemEnvironment]
2017-07-13 10:28:41,028 DEBUG main org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:103) Could not find key 'spring.liveBeansView.mbeanDomain' in any property source. Returning [null]
2017-07-13 10:28:41,066 DEBUG main org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246) Returning cached instance of singleton bean 'dependentBean'
DependentBean:=======寫資源
2017-07-13 10:28:41,114 INFO  Thread-0 org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1042) Closing org.springframework.context.support.ClassPathXmlApplicationContext@7c30a502: startup date [Thu Jul 13 10:28:39 CST 2017]; root of context hierarchy
2017-07-13 10:28:41,116 DEBUG Thread-0 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246) Returning cached instance of singleton bean 'lifecycleProcessor'
2017-07-13 10:28:41,116 INFO  Thread-0 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:444) Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1e6d1014: defining beans [resourceBean,dependentBean]; root of factory hierarchy
2017-07-13 10:28:41,116 DEBUG Thread-0 org.springframework.beans.factory.support.DisposableBeanAdapter.invokeCustomDestroyMethod(DisposableBeanAdapter.java:303) Invoking destroy method 'destroy' on bean with name 'dependentBean'
DependentBean:=======銷燬
2017-07-13 10:28:41,117 DEBUG Thread-0 org.springframework.beans.factory.support.DisposableBeanAdapter.invokeCustomDestroyMethod(DisposableBeanAdapter.java:303) Invoking destroy method 'destory' on bean with name 'resourceBean'
ResourceBean:============銷燬
ResourceBean:===========釋放資源，執行一些清理操做
*/
public class MoreDependencyInjectTest {

    @Test
    public void testDependOn() throws IOException{
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("di/depent-on.xml");
        //註冊銷燬回調  不然定義的銷燬方法不執行
        context.registerShutdownHook();
        DependentBean dependent = context.getBean("dependentBean", DependentBean.class);
        dependent.write("測試寫入數據");
    }
}