Spring boot IOC

首先需要在配置文件中定义bean，比如下面的文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="studentbean" class="com.example.Student">
<property name="name" value="zzd"></property>
</bean>

<bean id="poemservicebean" class="cn.jiagoushi.poemgame.poemservicexml.PoemService">
</bean>

<bean id="checkanswerfactorybean" class="com.example.CheckAnswerServiceFactory">
</bean>

<bean id="duishicheckanswerbean" class="cn.jiagoushi.poemgame.domain.service.duishi.DuishiCheckAnswer">
    <constructor-arg ref="poemservicebean"/>
</bean>
<bean id="feihualingcheckanswerbean" class="cn.jiagoushi.poemgame.domain.service.feihualing.FeihualingCheckAnswer">
    <constructor-arg ref="poemservicebean"/>
</bean>
<bean id="jielongcheckanswerbean" class="cn.jiagoushi.poemgame.domain.service.jielong.JielongCheckAnswer">
    <constructor-arg ref="poemservicebean"/>
</bean>
</beans>

每个bean有id和class，在constructor-arg中指出在构造函数中传入的bean。
在调用时，需要从配置文件中创建上下文： ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
在使用时，从上下文中获取bean:
ICheckAnswerServiceFactory factory=(ICheckAnswerServiceFactory)context.getBean("checkanswerfactorybean");
下面是使用这种方式创建的工厂类代码：

public class CheckAnswerServiceFactory implements ICheckAnswerServiceFactory {

    @Override
    public ICheckAnswerService GetService(GameType gameType) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        String servicetype = gameType.getMainType() + "checkanswerbean";
        return (ICheckAnswerService) context.getBean(servicetype);
    }

根据游戏的类型返回相应的服务，相关的服务在xml中注册，这里，根据传入参数可以获取具体的类型。