spring-bean容器
1.创建实例方式

1.用bean构造方法实例化对象 <bean id="XXXbean" class=""/>
2.工厂方法实例化对象 <bean id="XXXfacotry" class=""/> <bean id="XXXbean" factory-bean="XXXfacotry" factory-method=""/>
3.工厂静态方法实例化对象 <bean id="XXXbean" class="XXXfactoryClass" factory-method=""/>

2.属性

scope-------
singleton (默认)
prototype (多例)
request
session

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