spring2.5系列之---------三种实例化Bean的方法_怎么会出现无法实例化inputstrean-优快云博客

本文探讨了如何使用Spring框架的ApplicationContext来管理类的实例，并通过工厂方法创建不同类型的对象实例。具体展示了如何配置bean，实现类与工厂方法的结合，以及在测试场景中验证其功能。

@Test
	public void test()
	{
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		PeopleService peopleService = (PeopleService) ctx.getBean("peopleService");
		peopleService.save();
	}

	@Test
	public void test2()
	{
		TigerClassPathXMLApplicationContext ctx = new TigerClassPathXMLApplicationContext("applicationContext.xml");
		PeopleService peopleService = ((PeopleServiceBeanFactory) ctx.getBean("peopleServiceBeanFactory")).createPeopleServiceBean();
		peopleService.save();
	}
	
	@Test
	public void test3()
	{
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		PeopleService peopleService = (PeopleService) ctx.getBean("peopleServiceBeanFactory2");
		peopleService.save();
	}

<bean id="peopleService" class="com.tiger.service.imple.PeopleServiceBean"></bean>

	<bean id="peopleServiceBeanFactory" class="com.tiger.service.imple.PeopleServiceBeanFactory"></bean>
		
	<bean id="peopleServiceBeanFactory2" factory-bean="peopleServiceBeanFactory"
		factory-method="createPeopleServiceBean2"></bean>

package com.tiger.service.imple;

public class PeopleServiceBeanFactory
{
	public static PeopleServiceBean createPeopleServiceBean()
	{
		return new PeopleServiceBean();
	}
	
	public PeopleServiceBean createPeopleServiceBean2()
	{
		return new PeopleServiceBean();
	}
}

public class PeopleServiceBean implements PeopleService
{
	public void save()
	{
		System.out.println("我是save()方法");
	}
}

结果：

我是save()方法