Bean的作用域：

singleton：单例，指一个Bean容器中只存在一份

prototype：每次请求（每次使用）创建新的实例

Bean.xml编写方式

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <bean id="sayHelloId" class="IOC.bbeanScope.SayHello" scope="singleton">
        <property name="message" value="Hello To SayHello!"/>
    </bean>
    <bean id="sayHelloId2" class="IOC.bbeanScope.SayHello" scope="prototype">
        <property name="message" value="Hello To SayHello!"/>
    </bean>
</beans>