Spring--bean的作用范围

在Spring中，bean的作用范围分以下几种：　

　　singleton：spring ioc容器中仅有一个bean实例，bean以单例的方式存在
　　prototype：每次从容器中调用bean时，都返回一个新的实例
　　request：每次http请求都会创建一个新的bean
　　session：同一个http session共享一个bean
　　global session：同一个全局session共享一个bean 一般用于portlet应用环境
　　application：同一个application共享一个bean

singleton

package com.fuwh.test;

public class Dog {
    
    public int id;
    public String name;
    public int age;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Dog [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    
    
}

<?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="dog" class="com.fuwh.test.Dog" scope="singleton">
        <property name="id" value="001"></property>
        <property name="name" value="heihu"></property>
        <property name="age" value="5"></property>
    </bean>   
    

</beans>

package com.fuwh.test;


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

public class Test {

    private ApplicationContext ac;    

    @Before
    public void setUp() throws Exception {
        ac=new ClassPathXmlApplicationContext("beans.xml");
    }

    @org.junit.Test
    public void test() {
        System.out.println(ac.getBean("dog")==ac.getBean("dog"));
    }
}

返回结果 ： true

<?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="dog" class="com.fuwh.test.Dog" scope="prototype">
        <property name="id" value="001"></property>
        <property name="name" value="heihu"></property>
        <property name="age" value="5"></property>
    </bean>   
    

</beans>

package com.fuwh.test;


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

public class Test {

    private ApplicationContext ac;    

    @Before
    public void setUp() throws Exception {
        ac=new ClassPathXmlApplicationContext("beans.xml");
    }

    @org.junit.Test
    public void test() {
        System.out.println(ac.getBean("dog")==ac.getBean("dog"));
    }
}

返回结果：false