Aware結尾的介面用途——向容器獲取資源。

對兩個介面舉例：BeanNameAware，ApplicationContextAware。

首先對ApplicationContextAware介面的實現做一個例項：

//1.類
package com.imooc.aware;

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


public class MoocApplicationContext implements ApplicationContextAware  {
	
//重寫介面方法
	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
//這裡就可以從容器內獲取自身的bean。
		System.out.println("MoocApplicationContext : " + applicationContext.getBean("moocApplicationContext"));
	}
	
}
 

//2.xml檔案
<?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>
        
 </beans>
 

//3.測試
package com.imooc.test.aware;

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

//import com.imooc.aware.MoocApplicationContext;
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"));
	
	}
}
 

//4，結果
8月 02, 2018 1:11:55 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
資訊: Refreshing org[email protected]146044d7: startup date [Thu Aug 02 13:11:55 CST 2018]; root of context hierarchy
8月 02, 2018 1:11:55 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from class path resource [spring-aware.xml]
MoocApplicationContext : 252277567
testMoocApplicationContext : 252277567
8月 02, 2018 1:11:55 下午 org.springframework.context.support.AbstractApplicationContext doClose
資訊: Closing org[email protected]146044d7: startup date [Thu Aug 02 13:11:55 CST 2018]; root of context hierarchy

可以看到在首先是setApplicationContext（）方法的輸出，然後是測試類方法的輸出，其中兩個返回都是xml配置的容器中相同的bean物件，說明這個操作，可以讓類獲取容器中的bean物件資源（這塊確實不太懂）。

下面是第二個例項，實現BeanNameAware介面，

//1.類
package com.imooc.aware;

import org.springframework.beans.factory.BeanNameAware;

public class MoocBeanName implements BeanNameAware {
	
	@Override
	public void setBeanName(String name) {
		System.out.println("MoocBeanName : " + name);
	}
}

這個是讀取容器裡bean的name的作用，所以不用getBean。

//2.xml檔案配置
<?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="moocBeanName" class="com.imooc.aware.MoocBeanName" ></bean> 
        
 </beans>

//3.測試類
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 textMoocBeanName() {
		System.out.println("textMoocBeanName : " + super.getBean("moocBeanName"));
	}
	
}

//4.結果
8月 02, 2018 1:23:12 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
資訊: Refreshing org[email protected]146044d7: startup date [Thu Aug 02 13:23:12 CST 2018]; root of context hierarchy
8月 02, 2018 1:23:12 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from class path resource [spring-aware.xml]
MoocBeanName : moocBeanName
textMoocBeanName : [email protected]
8月 02, 2018 1:23:12 下午 org.springframework.context.support.AbstractApplicationContext doClose
資訊: Closing org[email protected]146044d7: startup date [Thu Aug 02 13:23:12 CST 2018]; root of context hierarchy

看到在類中獲取了容器內bean的name，在測試類裡面獲得了相應的bean。

這塊內容有點亂，還需要後面繼續加強學習。