学习 Spring (五) Aware 接口
Spring入门篇 学习笔记
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
示例
ApplicationContextAware
添加配置文件 spring-aware-applicationcontext.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="moocApplicationContext" class="com.karonda.aware.MoocApplicationContext" ></bean>
</beans>
实现接口：
public class MoocApplicationContext implements ApplicationContextAware {
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
System.out.println("MoocApplicationContext : " + applicationContext.getBean("moocApplicationContext").hashCode());
}
}
添加测试类：
@RunWith(BlockJUnit4ClassRunner.class)
public class TestApplicationContextAware extends UnitTestBase {
public TestApplicationContextAware() {
super("classpath:spring-aware-applicationcontext.xml");
}
@Test
public void testMoocApplicationContext() {
System.out.println("testMoocApplicationContext : " + super.getBean("moocApplicationContext").hashCode());
}
}
MoocBeanName
添加配置文件 classpath:spring-aware-beanname.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="moocBeanName" class="com.karonda.aware.MoocBeanName" ></bean>
</beans>
实现接口：
public class MoocBeanName implements BeanNameAware {
@Override
public void setBeanName(String name) {
System.out.println("MoocBeanName : " + name);
}
}
添加测试类：
@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanNameAware extends UnitTestBase {
public TestBeanNameAware() {
super("classpath:spring-aware-beanname.xml");
}
@Test
public void textMoocBeanName() {
System.out.println("textMoocBeanName : " + super.getBean("moocBeanName"));
}
}
同时实现 ApplicationContextAware 和 MoocBeanName
修改 MoocBeanName：
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());
}
}
修改 TestBeanNameAware：
@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanNameAware extends UnitTestBase {
public TestBeanNameAware() {
super("classpath:spring-aware-beanname.xml");
}
@Test
public void textMoocBeanName() {
System.out.println("textMoocBeanName : " + super.getBean("moocBeanName").hashCode());
}
}
