Spring入门——（六、Aware）

Aware

>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，可以获取相应资源

>通过Aware接口，可以对spring相应资源进行操作（一定要慎重）

>为对spring进行简单的扩展提供了方便的入口

官网文档：

示例：

MoocApplicationContext类：

package com.imooc.aware;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


public class MoocApplicationContext implements ApplicationContextAware  {
	
	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		System.out.println("MoocApplicationContext : " + applicationContext.getBean("moocApplicationContext").hashCode());
	}
	
}

MoocBeanName类：

package com.imooc.aware;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


public class MoocBeanName implements BeanNameAware, ApplicationContextAware {

	private String beanName;
	
	@Override
	public void setBeanName(String name) {
		this.beanName = name;
		System.out.println("MoocBeanName : " + name);
	}

	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		System.out.println("setApplicationContext : " + applicationContext.getBean(this.beanName).hashCode());
	}

}

spring—Aware.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd" >
        
<!--         <bean id="moocApplicationContext" class="com.imooc.aware.MoocApplicationContext" ></bean> -->

	<bean id="moocBeanName" class="com.imooc.aware.MoocBeanName" ></bean>
        
 </beans>

测试类：

package com.imooc.test.aware;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

import com.imooc.test.base.UnitTestBase;

@RunWith(BlockJUnit4ClassRunner.class)
public class TestAware extends UnitTestBase {
	
	public TestAware() {
		super("classpath:spring-aware.xml");
	}
	
//	@Test
//	public void testMoocApplicationContext() {
//		System.out.println("testMoocApplicationContext : " + super.getBean("moocApplicationContext").hashCode());
//	}
	
	@Test
	public void textMoocBeanName() {
		System.out.println("textMoocBeanName : " + super.getBean("moocBeanName").hashCode());
	}
	
}

输出结果为：

七月 10, 2018 9:20:26 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5d22bbb7: startup date [Tue Jul 10 21:20:26 GMT+08:00 2018]; root of context hierarchy
七月 10, 2018 9:20:26 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring-aware.xml]
MoocBeanName : moocBeanName
setApplicationContext : 1383547042
textMoocBeanName : 1383547042
七月 10, 2018 9:20:26 下午 org.springframework.context.support.AbstractApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@5d22bbb7: startup date [Tue Jul 10 21:20:26 GMT+08:00 2018]; root of context hierarchy