spring 2.x 之控制反转(ioc)

public class KnightOfTheRoundTable implements Knight {
  private String name;
  private Quest quest;
  
  public KnightOfTheRoundTable(String name) {
    this.name = name;
  }
  
  public Object embarkOnQuest() throws QuestFailedException {
    return quest.embark();
  }
  
  public void setQuest(Quest quest) {
    this.quest = quest;
  }
  
  public String getName() {
    return name;
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
    "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
  <bean id="quest"
      class="com.springinaction.chapter01.knight.HolyGrailQuest"/>

  <bean id="knightTarget"
      class="com.springinaction.chapter01.knight.KnightOfTheRoundTable">
    <property name="name" value="hello"/>
    <property name="quest">
      <ref bean="quest"/>
    </property>
  </bean>
</beans>

public class KnightApp {
  public static void main(String[] args) throws Exception {

　　BeanFactory factory =   //BeanFactory 其实是spring容器，用来装载bean
　　new XmlBeanFactory(new FileSystemResource("knight.xml"));

    Knight knight =
        (Knight) ctx.getBean("knight");

    knight.embarkOnQuest();
  }
}