三种实例化Spring中Bean对象的方式-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_17959/article/details/82233460

本文介绍了Spring中三种实例化Bean的方法：使用类构造器、静态工厂方法和实例化工厂方法，并通过具体示例展示了每种方法的应用场景。

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1、使用类构造器实例化。

<bean id="stockService" class="cn.itcast.service.impl.StockServiceImpl"></bean>

2、使用静态工厂方法实例化bean

<bean id="personServiceFactory" class="cn.itcast.service.impl.PersonServiceBeanFactory" factory-method="createPersonServiceBeanFactory"></bean>

3、使用实例化工厂方法实例化bean

<bean id="personServiceFactory2" class="cn.itcast.service.impl.PersonServiceBeanFactory"></bean>

<bean id="personServiceFactory3" factory-bean="personServiceFactory2" factory-method="createPersonServiceBeanFactory2"></bean>

package cn.itcast.service.impl;

public class PersonServiceBeanFactory {
public static PersonServiceBean createPersonServiceBeanFactory() {
return new PersonServiceBean();
}
public PersonServiceBean createPersonServiceBeanFactory2() {
return new PersonServiceBean();
}
}

测试Case
@Test public void instanceSpring3() {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
PersonService personService = (PersonService)ctx.getBean("personServiceFactory3");
personService.save();
}