scope的范围

（一）scope=“singleton”

知识点：无论获取多少个bean，得到的总是一样的地址，singleton范围下只会创建一个bean实例

1.Bean4.java

package com.inspur.scope;

public class Bean4 {

}

2.InstanceTest.java

package com.inspur.scope;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.inspur.static_factory.Bean2;

public class InstanceTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String xmlPath = "com/inspur/scope/beans4.xml";
        //2.ApplicationContext 在加载文件时，对bean实例化
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
        Bean4 bean4 = (Bean4) applicationContext.getBean("bean4");
        System.out.println(bean4);
        Bean4 bean5 = (Bean4) applicationContext.getBean("bean4");
        System.out.println(bean5);

    }

}

3.bean4.xml

<?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.xsd">
       <bean id="bean4" class="com.inspur.scope.Bean4" scope="singleton"></bean>
</beans>

4.此时的运行结果是：

5.如果将更改为prototype则获得两个不同的值。

运行结果如下：