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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