日期: 2016-7-15
内容: spring中的Aware相关的一些接口功能描述;
1、 Spring中提供了一些以Aware结尾的接口,实现了Aware接口的bean在被初始化之后,可以获取相应的资源。
2、 通过Aware接口,可以对Spring相应的资源进行操作(一定要慎重);
3、 为了对Spring进行简单的扩展提供了方便的入口。
以下对Aware相关的部分接口作介绍:ApplicationContextAware和BeanNameAware等进行介绍。
①、ApplicationContextAware:
在实现了这个接口之后,他可以提供对Spring IOC容器的上下文进行操作的功能。声明应用上下文的。
②、BeanNameAware:
提供对BeanName进行操作。
③、 ApplicationEventPublisherAware:
主要用于事件的发布。
④、BeanClassLoadAware:
相关的类加载器。
⑤、BeanFactoryAware:
声明BeanFactory的。
⑥、 BootstrapContextAware:
⑦、 LoadTimeWeaverAware:
一、 ApplicationContextAware接口的实现演示如下:
1、编写: com.bean.TestApplicationContextAware.java类实现ApplicationContextAware接口:
package com.bean;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class TestApplicationContextAware implements ApplicationContextAware {
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
//这里加载的Bean是在配置文件applicationContext_Aware.xml里面进行配置的Bean
System.out.println("applicationContext : "+applicationContext.getBean("applicationContextAware"));
}
}
2
、 在配置文件applicationContext_Aware.xml里面配置Bean:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<bean id="applicationContextAware" class="com.bean.TestApplicationContextAware"></bean>
</beans>
3、编写测试类com.test..BeanLifeCycleTest.java:
<span style="white-space:pre"> </span>@Test
public void testApplicationContextAware()
{
//加载Spring配置文件
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext_Aware.xml");
}
4、运行的结果如下:
2016/07/15 11:10:00 org.springframework.context.support.AbstractApplicationContext prepareRefresh
情報: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@9664a1: startup date [Fri Jul 15 11:10:00 CST 2016]; root of context hierarchy
2016/07/15 11:10:01 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
情報: Loading XML bean definitions from class path resource [applicationContext_LifeCycle.xml]
开始日期: 2016年10月15日 11时:10分:654秒
2016/07/15 11:10:01 org.springframework.context.support.AbstractApplicationContext prepareRefresh
情報: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1484a05: startup date [Fri Jul 15 11:10:01 CST 2016]; root of context hierarchy
2016/07/15 11:10:01 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
情報: Loading XML bean definitions from class path resource [applicationContext_Aware.xml]
applicationContext : com.bean.TestApplicationContextAware@1e3cd51
结束日期: 2016年10月15日 11时:10分:720秒
从结果分析可知:
applicationContext : com.bean.TestApplicationContextAware@1e3cd51
在初始化容器的时候调用了
setApplicationContext得到了以上的输出结果。
二、 BeanNameAware接口的演示:
1、 编写: com.bean.TestBeanNameAware.java类实现BeanNameAware接口:
package com.bean;
import org.springframework.beans.factory.BeanNameAware;
public class TestBeanNameAware implements BeanNameAware {
@Override
public void setBeanName(String beanName) {
System.out.println("BeanName: "+beanName);
}
}
2、 在配置文件applicationContext_Aware.xml里面配置Bean:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span><!--
<span style="white-space:pre"> </span><bean id="applicationContextAware" class="com.bean.TestApplicationContextAware"></bean>
<span style="white-space:pre"> </span> -->
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span><bean id="beanName" class="com.bean.TestBeanNameAware"></bean>
</beans>
3、编写测试类com.test..BeanLifeCycleTest.java:
@Test
public void testBeanNameAware()
{
//加载Spring配置文件
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext_Aware.xml");
}
4、运行的结果如下:
2016/07/15 11:34:19 org.springframework.context.support.AbstractApplicationContext prepareRefresh
情報: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1be2d65: startup date [Fri Jul 15 11:34:19 CST 2016]; root of context hierarchy
2016/07/15 11:34:19 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
情報: Loading XML bean definitions from class path resource [applicationContext_LifeCycle.xml]
2016/07/15 11:34:20 org.springframework.context.support.AbstractApplicationContext prepareRefresh
情報: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1484a05: startup date [Fri Jul 15 11:34:20 CST 2016]; root of context hierarchy
2016/07/15 11:34:20 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
情報: Loading XML bean definitions from class path resource [applicationContext_Aware.xml]
开始日期: 2016年34月15日 11时:34分:02秒
BeanName: beanName
结束日期: 2016年34月15日 11时:34分:57秒
正确的获取了Bean的name:
BeanName: beanName