a. 普通方法
public class PersonServiceBean implements PersonService { public void save(){ System.out.println("我是save()方法"); } }
<bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean>
@Test public void instanceSpring(){ ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); PersonService personService = (PersonService)ctx.getBean("personService"); personService.save(); }
b. 静态工厂方法
public class PersonServiceBeanFactory { public static PersonServiceBean createPersonServiceBean(){ return new PersonServiceBean(); } }
<bean id="personService2" class="cn.itcast.service.impl.PersonServiceBeanFactory" factory-method="createPersonServiceBean"/>
@Test public void instanceSpring(){ ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); PersonService personService = (PersonService)ctx.getBean("personService2"); personService.save(); }
c. 工厂方法
public class PersonServiceBeanFactory { public PersonServiceBean createPersonServiceBean2(){ return new PersonServiceBean(); } }
<bean id="personServiceFactory" class="cn.itcast.service.impl.PersonServiceBeanFactory"/> <bean id="personService3" factory-bean="personServiceFactory" factory-method="createPersonServiceBean2"/>
@Test public void instanceSpring(){ ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); PersonService personService = (PersonService)ctx.getBean("personService3"); personService.save(); }