Spring Aware

Spring中 有很多Aware结尾接口, 例如BeanFactoryAware, ApplicationContextAware, ServletContextAware，BeanNameAware，ApplicationEventPublisherAware，BeanClassLoaderAware，BeanStrapContextAware,LoadTimeWeaverAware,MessageSourceAware,NotificationPublisherAware
在程序中 我们自定义的bean实现了 Aware相关接口 spring 通过回调 就可以获得一些资源

---

 <bean id="moocApplicationContext" class="com.imooc.aware.MoocApplicationContext" ></bean>

package com.imooc.aware;

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


public class MoocApplicationContext implements ApplicationContextAware  {

    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        System.out.println("MoocApplicationContext : " + applicationContext.getBean("moocApplicationContext").hashCode());
    }

}

package com.imooc.aware;

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


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());
    }

}

<bean id="moocBeanName" class="com.imooc.aware.MoocBeanName" ></bean>

注意：实现Aware的Bean在获得实例时重写的方法会被执行。