spring BeanFactory加载xml配置文件示例

项目目录结构如下：

HelloWorld.java

package com.thief.demo;

public class HelloWorld {

    public void sayHello() {
        System.out.println("hello world!");
    }

}

helloworld-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" >
<beans>
    <bean id="helloworld" class="com.thief.demo.HelloWorld"/>
</beans>

Test.java

package com.thief.demo;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

public class Test {

    public static void main(String[] args) {
        
        DefaultListableBeanFactory beanRegistry = new DefaultListableBeanFactory();
        XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanRegistry);
        reader.loadBeanDefinitions("classpath:com/thief/demo/helloworld-config.xml");
        BeanFactory container = (BeanFactory)beanRegistry;
        
        HelloWorld helloworld = (HelloWorld)container.getBean("helloworld");
        helloworld.sayHello();
        
    }

}