Spring实战之容器后处理器操作示例

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://www.springframework.org/schema/beans"
   xmlns:p="http://www.springframework.org/schema/p"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
   <!-- 配置两个简单Bean实例 -->
   <bean id="steelAxe" class="org.crazyit.app.service.impl.SteelAxe"/>
   <bean id="chinese" class="org.crazyit.app.service.impl.Chinese"
      init-method="init" p:name="孙悟空" p:axe-ref="steelAxe"/>
   <!-- 配置容器后处理器 -->
   <bean id="beanFactoryPostProcessor"
      class="org.crazyit.app.util.MyBeanFactoryPostProcessor"/>
</beans>

package org.crazyit.app.service;
public interface Axe
{
   public String chop();
}

package org.crazyit.app.service;
public interface Person
{
   public void useAxe();
}

package org.crazyit.app.service.impl;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.crazyit.app.service.*;
public class Chinese
  implements Person,InitializingBean
{
  private Axe axe;
  private String name;
  public Chinese()
  {
    System.out.println("Spring实例化主调bean：Chinese实例...");
  }
  public void setAxe(Axe axe)
  {
    this.axe = axe;
  }
  public void setName(String name)
  {
    System.out.println("Spring执行setName()方法注入依赖关系...");
    this.name = name;
  }
  public void useAxe()
  {
    System.out.println(name + axe.chop());
  }
  // 下面是两个生命周期方法
  public void init()
  {
    System.out.println("正在执行初始化方法 init...");
  }
  public void afterPropertiesSet() throws Exception
  {
    System.out.println("正在执行初始化方法 afterPropertiesSet...");
  }
}

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class SteelAxe
   implements Axe
{
   public SteelAxe()
   {
      System.out.println("Spring实例化依赖bean：SteelAxe实例...");
   }
   public String chop()
   {
      return "钢斧砍柴真快";
   }
}

package org.crazyit.app.util;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class MyBeanFactoryPostProcessor
  implements BeanFactoryPostProcessor
{
  /**
   * 重写该方法，对Spring进行后处理。
   * @param beanFactory Spring容器本身
   */
  public void postProcessBeanFactory(
    ConfigurableListableBeanFactory beanFactory)
    throws BeansException
  {
    System.out.println("程序对Spring所做的BeanFactory的初始化没有改变...");
    System.out.println("Spring容器是：" + beanFactory);
  }
}

package lee;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.crazyit.app.service.*;
public class BeanTest
{
  public static void main(String[] args)
  {
    // 以ApplicationContex作为Spring容器
    // 它会自动注册容器后处理器、Bean后处理器
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    Person p = (Person)ctx.getBean("chinese");
    p.useAxe();
  }
}