ApplicationContextAware

1.编写一个JavaBean实现ApplicationContextAware方法

Test.java

public class Test implements ApplicationContextAware {
private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public void setApplicationContext(ApplicationContext context)
throws BeansException {
Test test = (Test) context.getBean("test");
System.out.println("内部打印 : " + test.getName());
}

}

如果实现了ApplicationContextAware接口，在Bean的实例化时会自动调用setApplicationContext()方法

2.把这个JavaBean加入Spring的管理

<?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-2.5.xsd">
<bean id="test" class="com.wj.spring.lesson3.applicationcontextaware.Test">
<property name="name" value="hello"></property>

</bean>
</beans>

3.测试这个JavaBean

TestBean.java

public class TestBean {

public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    Test hb = (HelloBean)context.getBean("test");
}

}

4.查看控制台打印的结果

内部打印 : hello

从数据结果可以看出setApplicationContext()方法确实在bean的初始化过程中被调用了