Spring BeanFactory和FactoryBean区别解析

//创建一个Spring定义的FactoryBean
public class ColorFactoryBean implements FactoryBean<Color> {

  //返回一个Color对象，这个对象会添加到容器中
  @Override
  public Color getObject() throws Exception {
    // TODO Auto-generated method stub
    System.out.println("ColorFactoryBean...getObject...");
    return new Color();
  }
  @Override
  public Class<?> getObjectType() {
    // TODO Auto-generated method stub
    return Color.class;
  }
  //是单例？
  //true：这个bean是单实例，在容器中保存一份
  //false：多实例，每次获取都会创建一个新的bean；
  @Override
  public boolean isSingleton() {
    // TODO Auto-generated method stub
    return false;
  }
}

public class Color {
  
  private Car car;

  public Car getCar() {
    return car;
  }

  public void setCar(Car car) {
    this.car = car;
  }

  @Override
  public String toString() {
    return "Color [car=" + car + "]";
  }
  
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

  <bean id="colorFactoryBean" class="spring2.ColorFactoryBean"></bean>

</beans>

public class Test1 {
    ClassPathXmlApplicationContext xmlBeanFactory = null;
    @Before
    public void initXmlBeanFactory() {
      System.out.println("\n========测试方法开始=======\n");
      xmlBeanFactory = new ClassPathXmlApplicationContext("spring3.xml");
    }

    @After
    public void after() {
      System.out.println("\n========测试方法结束=======\n");
    }

    @Test
    public void test8() {
      System.out.println(xmlBeanFactory.getBean("colorFactoryBean"));
       System.out.println("===================");
      System.out.println(xmlBeanFactory.getBean("&colorFactoryBean"));
    
    }
}

========测试方法开始=======

十二月 09, 2019 4:49:52 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2e5c649: startup date [Mon Dec 09 16:49:52 CST 2019]; root of context hierarchy
十二月 09, 2019 4:49:52 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring3.xml]
ColorFactoryBean...getObject...
Color [car=null]
===================
spring2.ColorFactoryBean@6ddf90b0

========测试方法结束=======