spring中单例中获取新的bean实例

spring中配置的单例实例中，如果需要每次获取新的属性对象，有两种方式。1、采用配置文件中的lookup-method元素   2、实现BeanFactoryAware接口。

public interface AxeInter {
	public void chop();
}

 

public class StoneAxe implements AxeInter {
	@Override
	public void chop() {
		System.out.println("石头斧头");
	}
}

 

<bean id="axe" class="springTest.impl.StoneAxe" scope="prototype">
</bean>

 

 

1.  采用配置文件中的lookup-method元素

 

public abstract class UserService2 {
	public abstract AxeInter getAxe();
}

 注意：没有get、set方法

 

 

<bean id="userService2" class="springTest.impl.UserService2">
		<lookup-method name="getAxe" bean="axe"/>
	</bean>

 

public class CopyOfSpringTest1 {

	private ApplicationContext context = null;
	

	@Before
	public void before(){
		context = new ClassPathXmlApplicationContext("applicationContext.xml");
	}
	
	@Test
	public void testMoreInstanceInSingleInstance(){
		UserService2 userService = context.getBean("userService2", UserService2.class);
		System.out.println(userService);
		System.out.println(userService.getAxe());
		
		UserService2 userService2 = context.getBean("userService2", UserService2.class);
		System.out.println(userService2);
		System.out.println(userService2.getAxe());
	}
}

 

   2.实现BeanFactoryAware接口。

public class UserService implements BeanFactoryAware{

	private AxeInter axe;
	private BeanFactory beanFactory;
	
	public AxeInter getAxe() {
		this.axe = (AxeInter)beanFactory.getBean("axe");
		return axe;
	}

	@Override
	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
		this.beanFactory = beanFactory;
	}
}

 注意：没有axe的set方法

<bean id="userService" class="springTest.impl.UserService">
	</bean>

 

@Test
	public void testMoreInstanceInSingleInstance(){
		UserService userService = context.getBean("userService", UserService.class);
		System.out.println(userService);
		System.out.println(userService.getAxe());
		
		UserService userService2 = context.getBean("userService", UserService.class);
		System.out.println(userService2);
		System.out.println(userService2.getAxe());
	}