【sping揭秘】4、某些无法注册到IOC容器的对象如何交给spring托管

package cn.cutter.start.bean;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.stereotype.Component;

@Component
public class NextDayDateFactoryBean implements FactoryBean {
    
    private int count = 0;

    @Override
    public Object getObject() throws Exception {
        MyObject mo = new MyObject();
        mo.setName("num:" + count++);
        return mo;
    }

    @Override
    public Class getObjectType() {
        
        return MyObject.class;
        
    }
    
    @Override
    public boolean isSingleton() {
        return false;
    }
}

@Test
    public void test3() {
        //测试spring的IOC容器中，默认是保持在IOC容器中只有一个实例
        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:application-bean.xml");
        //使用spring的factorybean
        //这里注意了，我们返回的对象不是NextDayDateFactoryBean，而是MyObject，很关键 ！！！！
        MyObject mo1 = (MyObject) ctx.getBean("nextDayDateFactoryBean");
        System.out.println("mo name is:" + mo1.getName());
        MyObject mo2 = (MyObject) ctx.getBean("nextDayDateFactoryBean");
        System.out.println("mo name is:" + mo2.getName());
        MyObject mo3 = (MyObject) ctx.getBean("nextDayDateFactoryBean");
        System.out.println("mo name is:" + mo3.getName());
        MyObject mo4 = (MyObject) ctx.getBean("nextDayDateFactoryBean");
        System.out.println("mo name is:" + mo4.getName());
        
        
    }