Spring实例化对象方式③.实例工厂方法实例化：解决系统遗留问题(了解)

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本文通过实例演示了如何使用Spring框架的实例工厂方法来创建Bean。通过定义一个工厂类Employee3Factory并实现getObject方法，然后在Spring配置文件中声明工厂Bean和通过factory-bean和factory-method属性指定工厂类及创建Bean的方法，最终在测试类中展示了两种获取Bean的方式：传统工厂模式和Spring框架的依赖注入。

Employee3Factort.java：

package text.spring._05_instance.instancefactory;

import text.spring._05_instance.staticfactory.Employee2;

/**
 * Created by Administrator on 2019/9/3.
 */
public class Employee3Factory {
    public Employee3 getObject(){
        System.out.println("实例工厂方法创建对象...");
        return new Employee3();
    }
}

App.java：

package text.spring._05_instance.instancefactory;

import text.spring._05_instance.staticfactory.Employee2;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * Created by Administrator on 2019/9/3.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class App {
    @Autowired
    private ApplicationContext context;

    @Test
    public void testOld(){
        Employee3Factory factory = new Employee3Factory();
        Employee3 employee3 = factory.getObject();
        System.out.println(employee3);
    }

    @Test
    public void testSpring() throws Exception {
        Employee3 employee3 = context.getBean(Employee3.class);
        System.out.println(employee3);
    }
}

App-context.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/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="factory" class="text.spring._05_instance.instancefactory.Employee3Factory"></bean>

    <bean id="employee3" factory-method="getObject" factory-bean="factory"></bean>
</beans>