spring ioc 容器装配bean_beanyan-优快云博客

本文链接：https://blog.youkuaiyun.com/yanquancai3918/article/details/78517118

本文详细介绍了Spring框架中Bean的三种实例化方式：构造器实例化、静态工厂方法实例化及实例工厂方法实例化，并提供了具体的XML配置示例。

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applicationContext.xml 配置

<?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>

三种实力化bean的方式

1. 使用类构造器实例化。

public class User {
	
}

<bean id="user1" class="com.zmf.domain.User"></bean>

2.静态工厂方法实例化

public class UserFactory {
	public static User getUserFactory(){
		return new User();
	}
}

<bean id="userFactory" class="com.zmf.domain.UserFactory" factory-method="getUserFactory"></bean>

3.使用实例工厂方法实例化(工厂方法模式):

public class UserFactory2 {
	public User getUser(){
		return new User();
	}
}

<bean id="userFactory2" class="com.zmf.domain.UserFactory2"></bean>
	<bean id="user2" factory-bean="userFactory2" factory-method="getUser"></bean>

测试：

@Test
	public void test2(){
	User user =	(User) applicationContext.getBean("userFactory");
	System.out.println(user);
	User user2 =	(User) applicationContext.getBean("userFactory");
	System.out.println(user2);
	}
	
	@Test
	public void test3(){
	User user =	(User) applicationContext.getBean("user2");
	System.out.println(user);
	User user2 =	(User) applicationContext.getBean("user2");
	System.out.println(user2);
	}

另：applicationContext 获取方式

new ClassPathXmlApplicationContext("applicationContext.xml"); //classpath

new FileSystemXmlApplicationContext('c:\\xx.xml'); // 系统文件

http://blog.youkuaiyun.com/hi_kevin/article/details/7325554 ActionContext 与 BeanFactory的区别