spring中bean默认都是单例
   singleton  默认值  单例

     容器初始化时（new ClassPathXmlApplicationContext("cn/et/lesson01/prototype/spring.xml")）实例化

<bean id="a" class="cn.et.lesson01.prototype.A" scope="singleton">
	<property name="name" value="zs"></property>
</bean>

测试

package cn.et.lesson01ioc_di;

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

public class TestCotainer {
    public static void main(String[] args) {
        //创建容器对象
		ApplicationContext context = new ClassPathXmlApplicationContext("cn/et/lesson01ioc_di/spring.xml");
		A a=(A)context.getBean("a");
		A a1=(A)context.getBean("a");
		System.out.println(a==a1);
    }
}

 prototype  多例
        在创建bean的时候 实例化 ------context.getBean()   

<bean id="a" class="cn.et.lesson01.prototype.A" scope="prototype">
	<property name="name" value="zs"></property>
</bean>

测试

package cn.et.lesson01ioc_di;

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

public class TestCotainer {
    public static void main(String[] args) {
        //创建容器对象
		ApplicationContext context = new ClassPathXmlApplicationContext("cn/et/lesson01ioc_di/spring.xml");
		A a=(A)context.getBean("a");
		A a1=(A)context.getBean("a");
		System.out.println(a==a1);
    }
}