spring bean 实例工厂实例化

spring bean 实例工厂实例化

在工厂类中创建一个实例方法来实例化对象。在配置bean时需要使用factory-bean属性指定配置的实例工厂，同时还需要使用factory-method属性指定实例工厂中的实例方法

1.创建工厂类BeanInstanceFactory

package instance;

public class BeanInstanceFactory {
	public BeanClass createBeanClassInstance() {
		return new BeanClass("调用实例工厂方法实例化bean");
	}
}

2.编辑配置文件

3.添加测试代码

package test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import instance.BeanClass;

public class TestInstance {
	public static void main(String[] args) {
		ApplicationContext appCon = new ClassPathXmlApplicationContext("applicationContext.xml");
		
		BeanClass b1 = (BeanClass)appCon.getBean("constructorInstance");
		System.out.println(b1+b1.message);
		
		//测试静态工厂实例化bean
		BeanClass b2 =(BeanClass)appCon.getBean("staticFacoryInstance");
		System.out.println(b2+b2.message);
		
		//测试实例广场实例化bean
		BeanClass b3 =(BeanClass)appCon.getBean("instanceFacoryInstance");
		System.out.println(b3+b3.message);
	}
}