Spring作用域為下面五種
request/session/globle session三種作用域為有Http請求時才能使用不然會出錯

request/session/globle session三種作用域為有Http請求時才能使用不然會出錯示範如下
修改applicationContext.xml的作用域

<bean id="helloWorld" class="com.springHello.HelloWorld" scope="session">
		<property name="username" value="John"></property>
	</bean>

然後執行後會出現錯誤如下

java.lang.IllegalStateException: No Scope registered for scope name 'session'
	at 

Spring初始化及銷毀
先在主程式撰寫初始化方法

public void init(){
		System.out.println("初始化");
	}

然後再applicationContex.xml加入init-method="init"

<bean id="helloWorld" class="com.springHello.HelloWorld" init-method="init">
		<property name="username" value="John"></property>
	</bean>

執行結果為下

十二月 21, 2017 11:12:29 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from class path resource [applicationContext.xml]
初始化
HelloWorld Spring John

如要規定applicationContex.xml的複數bean使用時都要初始化可以在修改這樣就會都做初始化的方法

applicationContex.xml

<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.xsd" default-init-method="init">
	
	<!--配置bean-->
	<bean id="helloWorld" class="com.springHello.HelloWorld">
		<property name="username" value="John"></property>
	</bean>
	<bean id="helloWorld2" class="com.springHello.HelloWorld">
		<property name="username" value="Mary"></property>
	</bean>

</beans>

主程式

        //從ClassPath找到資源文件
		Resource resource = new ClassPathResource("applicationContext.xml");
		//創建Spring容器(BeanFactor)
		BeanFactory beanFactory = new XmlBeanFactory(resource);
		//從Spring容器中獲取指定名稱對象
		//HelloWorld world = (HelloWorld) beanFactory.getBean("helloWorld2");
		//HelloWorld world = beanFactory.getBean(HelloWorld.class);
		HelloWorld world = beanFactory.getBean("helloWorld",HelloWorld.class);
		world.sayHello();
		HelloWorld world2 = beanFactory.getBean("helloWorld2",HelloWorld.class);
		world2.sayHello();

結果畫面

十二月 21, 2017 11:38:20 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from class path resource [applicationContext.xml]

初始化
HelloWorld Spring John
初始化
HelloWorld Spring Mary