spring学习六----------Bean的配置之Aware接口

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Aware

Spring提供了一些以Aware结尾的接口，实现了Aware接口的bean在被初始化后，可以获取相应的资源

通过Aware接口，可以对Spring相应资源进行操作

为Spring进行简单的扩展提供了方便的入口

本博客只对ApplicationContextAware和BeanNameAware进行测试

1.项目结构

2.pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId>org.springbean</groupId>
	<artifactId>SpringBean</artifactId>
	<packaging>jar</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>SpringBean Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<properties>
		<!-- 版本统一 -->
		<spring.version>4.3.7.RELEASE</spring.version>
	</properties>

	<dependencies>
		<!-- junit依赖 -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- spring核心依赖 -->
		<dependency>
		    <groupId>org.springframework</groupId>
		    <artifactId>spring-core</artifactId>
		    <version>${spring.version}</version>
		</dependency>
		<dependency>
		    <groupId>org.springframework</groupId>
		    <artifactId>spring-beans</artifactId>
		    <version>${spring.version}</version>
		</dependency>
		<dependency>
		    <groupId>org.springframework</groupId>
		    <artifactId>spring-context</artifactId>
		    <version>${spring.version}</version>
		</dependency>
	</dependencies>

	<build>
		<finalName>SpringBean</finalName>
	</build>
</project>

3.TestBase.java

package org.spring.aware.test;

import org.junit.After;
import org.junit.Before;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.util.StringUtils;

/**
 * 单元测试基类
 *
 */
public class TestBase {

	private ClassPathXmlApplicationContext context;
	private String springXmlPath;

	/**
	 * 无参构造器，若无此构造器则必须传入spring配置文件的路径，有此构造器可以设置默认值
	 */
	public TestBase() {

	}

	/**
	 * 含参构造器，初始化spring配置文件的位置
	 *
	 * @param springXmlPath
	 */
	public TestBase(String springXmlPath) {

		this.springXmlPath = springXmlPath;

	}

	/**
	 * 初始化加载spring配置文件，在@Test注解的方法执行之前执行
	 */
	@Before
	public void begin() {

		if(StringUtils.isEmpty(springXmlPath)) {//使用默认的spring配置文件
			springXmlPath = "classpath:spring-*.xml";
		}
		//加载配置文件至spring容器中
		context = new ClassPathXmlApplicationContext(springXmlPath.split("[,\\s]+"));
		//启动容器并将启动信号扩散至该容器中的所有组件
		context.start();

	}

	/**
	 * 销毁spring容器,在@Test注解的方法执行之后执行
	 */
	@After
	public void destroy() {

		context.destroy();

	}

	/**
	 * 根据beanID获取bean对象
	 *
	 * @param beanId
	 * 					beanId
	 * @return
	 */
	public Object getBean(String beanId) {

		return context.getBean(beanId);

	}

}

4.MyApplicationContext.java

package org.spring.aware;

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

public class MyApplicationContext implements ApplicationContextAware {

	public void setApplicationContext(ApplicationContext context) throws BeansException {

		System.out.println("MyApplicationContext:" + context.getBean("myApplicationContext"));

	}

}

5.MyBeanName.java

package org.spring.aware;

import org.springframework.beans.factory.BeanNameAware;

public class MyBeanName implements BeanNameAware {

	public void setBeanName(String name) {

		System.out.println("MyBeanName:" + name);

	}

}

6.spring-aware.xml

　　6.1 继承ApplicationContextAware接口

<?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="myApplicationContext" class="org.spring.aware.MyApplicationContext"/>

</beans>

　　6.2 继承BeanNameAware接口

<?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="myBeanName" class="org.spring.aware.MyBeanName"/>

</beans>

7.TestSpringAware.java

package org.spring.aware.test;

import org.junit.Test;

public class TestSpringAware extends TestBase {

	/**
	 * 通过构造器传入spring配置文件路径
	 */
	public TestSpringAware() {

		super("classpath:spring-aware.xml");

	}

	@Test
	public void testApplicationContext() {

		System.out.println("testApplicationContext:" + super.getBean("myApplicationContext"));

	}

	@Test
	public void testBeanName() {

		System.out.println("testBeanName:" + super.getBean("myBeanName"));

	}

}

8.效果预览

　　8.1 执行testApplicationContext方法

　　8.2 执行testBeanName方法

同时继承ApplicationContextAware和BeanNameAware两个接口

1.MyAware.java

package org.spring.aware;

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

public class MyAware implements ApplicationContextAware, BeanNameAware {

	private String name;

	public void setBeanName(String name) {

		this.name = name;

	}

	public void setApplicationContext(ApplicationContext context) throws BeansException {

		System.out.println("MyAware:" + context.getBean(name));

	}

}

2.spring-aware.xml

<?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="myAware" class="org.spring.aware.MyAware"/>

</beans>

3.TestSpringAware.java

package org.spring.aware.test;

import org.junit.Test;

public class TestSpringAware extends TestBase {

	/**
	 * 通过构造器传入spring配置文件路径
	 */
	public TestSpringAware() {

		super("classpath:spring-aware.xml");

	}

	@Test
	public void testApplicationContext() {

		System.out.println("testApplicationContext:" + super.getBean("myApplicationContext"));

	}

	@Test
	public void testBeanName() {

		System.out.println("testBeanName:" + super.getBean("myBeanName"));

	}

	@Test
	public void testAware() {

		System.out.println("testAware:" + super.getBean("myAware"));

	}

}

4.效果预览

　　4.1 执行testAware方法

参考：http://www.imooc.com/video/3755