spingIoc利用工厂调用方法创建对象

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ObjectFactory.java

// 工厂，创建对象public class ObjectFactory {// 实例方法创建对象public User getInstance() {return new User(100,"工厂：调用实例方法");}// 静态方法创建对象public static User getStaticInstance() {return new User(101,"工厂：调用静态方法");}}

bean.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"    xmlns:p="http://www.springframework.org/schema/p"    xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd"><!-- ###############对象创建############### --><!-- 3. 工厂类创建对象 --><!-- # 3.1 工厂类，实例方法 --><!-- 先创建工厂 --><bean id="factory" class="cn.itcast.b_create_obj.ObjectFactory"></bean><!-- 在创建user对象，用factory方的实例方法 --><bean id="user4" factory-bean="factory" factory-method="getInstance"></bean></beans>

输出：
-----User对象创建【带参数构造器】--------
User [id=100, name=工厂：调用实例方法]

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工厂类调用静态方法创建对象

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns:p="http://www.springframework.org/schema/p"    xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd"><!-- ###############对象创建############### --><!-- 3. 工厂类创建对象 --><!-- # 3.2 工厂类： 静态方法 --><!-- class 指定的就是工厂类型factory-method  一定是工厂里面的“静态方法” --><bean id="user" class="cn.itcast.b_create_obj.ObjectFactory" factory-method="getStaticInstance"></bean></beans>

public class App {// 测试：对象创建@Testpublic void testIOC() throws Exception {// 创建IOC容器对象ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/b_create_obj/bean.xml");// 获取容器中的对象//User user = (User) ac.getBean("user4");User user = (User) ac.getBean("user5");System.out.println(user);}}

输出：

-----User对象创建【带参数构造器】--------
User [id=101, name=工厂：调用静态方法]

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