Spring实战之抽象Bean和子Bean定义与用法示例

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://www.springframework.org/schema/beans"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
   <!-- 定义Axe实例 -->
   <bean id="steelAxe" class="org.crazyit.app.service.impl.SteelAxe"/>
   <!-- 指定abstract="true"定义抽象Bean -->
   <bean id="personTemplate" abstract="true">
      <property name="name" value="crazyit"/>
      <property name="axe" ref="steelAxe"/>
   </bean>
   <!-- 通过指定parent属性指定下面Bean配置可从父Bean继承得到配置信息 -->
   <bean id="chinese" class="org.crazyit.app.service.impl.Chinese"
      parent="personTemplate"/>
   <bean id="american" class="org.crazyit.app.service.impl.American"
      parent="personTemplate"/>
</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.crazyit.app.service.*;
public class American implements Person
{
   private Axe axe;
   private String name;
   public void setAxe(Axe axe)
   {
      System.out.println("Spring执行依赖关系注入...");
      this.axe = axe;
   }
   public void setName(String name)
   {
      this.name = name;
   }
   public void useAxe()
   {
      System.out.println("我是美国人：名字为：" + name
        + "。正在用斧头" + axe.chop());
   }
}

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class Chinese implements Person
{
   private Axe axe;
   private String name;
   public void setAxe(Axe axe)
   {
      System.out.println("Spring执行依赖关系注入...");
      this.axe = axe;
   }
   public void setName(String name)
   {
      this.name = name;
   }
   public void useAxe()
   {
      System.out.println("我是中国人：名字为：" + name
        + "。正在用斧头" + axe.chop());
   }
}

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class SteelAxe implements Axe
{
   public String chop()
   {
      return "钢斧砍柴真快";
   }
}

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class StoneAxe implements Axe
{
   public String chop()
   {
      return "石斧砍柴好慢";
   }
}

package lee;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.*;
import org.crazyit.app.service.*;
public class BeanTest
{
  public static void main(String[] args)
  {
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
  }
}