spring实例Bean的三种方式_实现接口FactoryBean(补充)

第一步:Bean3实体

public class Bean3 {

}

第二步:工厂(实现接口模式)

public class Bean4Factory implements FactoryBean {


    @Override
    public Object getObject() throws Exception {
        return new Bean3();
    }

    @Override
    public Class<?> getObjectType() {
        return null;
    }

    @Override
    public boolean isSingleton() {
        return false;
    }
}

第三步:配置

<!--补充:通过实现FactoryBean-->
<bean id="bean3_1" class="it.heima.Dao.Bean4Factory"/>

第四步:测试

@Test
public void testBean3_1(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    Bean3 bean3 = applicationContext.getBean("bean3_1", Bean3.class);
    System.out.println(bean3);
}