SPRING管理XML方式过程解析

package com.pheony.demo2;

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

public class Food implements BeanNameAware,ApplicationContextAware,InitializingBean,DisposableBean {

  public Food(){
    System.out.println("第一步，利用构造方法实例化啦");
  }

  private String name;    //食品名称
  public void setName(String name) {
    System.out.println("第二步，设置属性啦");
    this.name = name;
  }
  public String getName() {
    return name;
  }

  @Override
  public void setBeanName(String s) {
    System.out.println("第三步，设置bean的名称啦");
  }

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    System.out.println("第四步，了解工厂信息啦");
  }

  @Override
  public void afterPropertiesSet() throws Exception {
    System.out.println("第六步，属性设置后啦");
  }

  public void setup(){
    System.out.println("第七步，初始化啦");
  }

  public void run(){
    System.out.println("第九步，执行自身业务方法啦");
  }

  @Override
  public void destroy() throws Exception {
    System.out.println("第十步，执行spring的销毁方法啦");
  }

  public void setdown(){
    System.out.println("第十一步，执行自身销毁方法啦");
  }

}

package com.pheony.demo2;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

/**
 * 后处理bean，很关键，AOP就是利用这个实现的
 */
public class MyBeanPostProcessor implements BeanPostProcessor {
  @Override
  public Object postProcessBeforeInitialization(Object o, String s) throws BeansException {
    System.out.println("第五步，初始化前方法来啦");
    return o;
  }

  @Override
  public Object postProcessAfterInitialization(Object o, String s) throws BeansException {
    System.out.println("第八步，初始化后方法来啦");
    return o;
  }
}

<bean id="food" class="com.pheony.demo2.Food" scope="singleton" init-method="setup" destroy-method="setdown">
    <!--在实体类中属性最好都加上set/get方法，DI根据set/get方法找到对应的属性-->
    <property name="name" value="香蕉"></property>
  </bean>
  <bean class="com.pheony.demo2.MyBeanPostProcessor"></bean>

package com.pheony.demo2;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestFood {

  @Test
  public void test1(){
    ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
    Food food = (Food)ac.getBean("food");

    food.run();

    ac.close();
  }
}