实例化bean共有三种方式

实例化bean共有三种方式

1.使用类构造器实例化

<bean id="orderService" class="包名.pojo.OrderServiceBean" />

2.使用静态工厂方法实例化

<bean id="orderService" class="包名.service.OrderFactory" factory-method="createOrder" />

public class OrderFactory{

public static OrderServiceBean createOrder(){

return new OrderServiceBean();

}

}

测试

public class SpringTest{

@BeforeClass

public static void setUpBeforeClass() throws Exception{

}



@Test

public void instanceSpring(){

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

OrderServiceBean orderService = (OrderServiceBean)ctx.getBean("orderService");

orderService.save();



}

}

3.使用实例工厂方法实例化(即先要实例化工厂，然后再利用这个实例化的工厂)

<bean id="personServiceFactory" class="包名.service.OrderFactory"/>

<bean id="personService" factory-bean="personServiceFactory" factory-method="createOrder" />

public class OrderFactory{

public OrderServiceBean createOrder(){

return new OrderServiceBean();

}

}

测试

public class SpringTest{

@BeforeClass

public static void setUpBeforeClass() throws Exception{

}



@Test

public void instanceSpring(){

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

PersonService personService = (personService)ctx.getBean("personService");

personService.save();



}

}