java Spring scope设置为prototype，为什么两次生成的都是同一个实例

Question

CurrentTime.java

import java.util.Calendar;

public class CurrentTime {

    private Calendar now=Calendar.getInstance();

    public void printCurrentTime() {
        System.out.println(now.getTime());
    }
}

---

lookup.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-4.0.xsd">

<bean id="currentTime" class="cn.hxex.springcore.lookup.CurrentTime" scope="prototype"></bean>
<bean id="lookupBean" class="cn.hxex.springcore.lookup.LookupBean"   scope="singleton">
<lookup-method name="createCurrentTime" bean="currentTime"></lookup-method>
<property name="currentTime"  ref="currentTime"></property>
</bean>                         
</beans>    

---

LookupMain.java

import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class LookupMain {

    public static void main(String[] args) throws InterruptedException {
        // TODO Auto-generated method stub
           ClassPathResource resource=new ClassPathResource("cn/hxex/springcore/lookup/LookupBeans.xml");
           XmlBeanFactory factory=new XmlBeanFactory(resource);
//           LookupBean lookupBean=(LookupBean) factory.getBean("lookupBean");
//           System.out.println("get");
//           lookupBean.getCurrentTime().printCurrentTime();
//           System.out.println("create");
//           lookupBean.createCurrentTime().printCurrentTime();
//           System.out.println("------------");
//           Thread.sleep(1000);
//           System.out.println("get");
//           lookupBean.getCurrentTime().printCurrentTime();
//           System.out.println("create");
//           lookupBean.createCurrentTime().printCurrentTime();
//           System.out.println("-----------");
           CurrentTime ct=(CurrentTime) factory.getBean("currentTime");
           System.out.println("一");
           ct.printCurrentTime();
           System.out.println("-----------");
           Thread.sleep(5000);
           System.out.println("二");
           ct.printCurrentTime();

    }

}

Answer 1

你这个测试方法并不能说明问题的呀，你打印了两次 ct ，同一个对象的时间属性当然是一样的啦。
应该是间隔一段时间先后获取两次 Bean ID 相同的实例，再打印时间，肯定是不同的。这样测试试一下：

           CurrentTime ct1=(CurrentTime) factory.getBean("currentTime");
           System.out.println("一");
           ct1.printCurrentTime();
                     Thread.sleep(5000);
           CurrentTime ct2=(CurrentTime) factory.getBean("currentTime");
           System.out.println("一");
           ct2.printCurrentTime();

prototype 方式，第二次获取时会创建一个新实例，时间也是不同的。