使用Spring(二)实例化方式（静态工厂，实例工厂）

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1.applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><!-- <bean id="dogBean" class="com.yw.test02.Dog"> </bean> --><!-- <alias name="dogBean" alias="dogBean3" /> --><!-- createInstance()必须是一个static方法。 --><bean id="exampleBean" class="com.yw.test02.Dog" factory-method="createInstance" /><!-- the factory bean, which contains a method called createInstance() --><bean id="myFactoryBean" class="com.yw.test02.Dog"></bean><!-- the bean to be created via the factory bean --><bean id="exampleBean2" factory-bean="myFactoryBean"factory-method="createInstance2" /></beans>

2.测试类

package com.yw.test02;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.FileSystemResource;import org.springframework.core.io.Resource;public class Test02{public static void main(String[] args){Resource is = new FileSystemResource("src/com/yw/test02/applicationContext3.xml");BeanFactory factory = new XmlBeanFactory(is);//使用 静态工厂方法实例化Object obj1=factory.getBean("exampleBean");//使用实例工厂方法实例化Object obj2=factory.getBean("exampleBean2");System.out.println("obj1="+obj1);System.out.println("obj2="+obj2);}}

3.Dog类

package com.yw.test02;public class Dog{private String name;public String getName(){return name;}public void setName(String name){this.name = name;}public static Object createInstance(){System.out.println("==public static void createInstance()==");return "createInstance()返回值";}public Object createInstance2(){System.out.println("==public void createInstance2()==");return "createInstance2返回值";}@Overridepublic String toString(){return "Dog [name=" + name + "]";}}

4.运行如图

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