public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext; // Spring应用上下文环境

    @Override

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        SpringContextUtil.applicationContext = applicationContext;

    }

    /**

     * 获取对象

     *

     * @param name

     * @return Object 一个以所给名字注册的bean的实例

     * @throws BeansException

     */

    public static Object getBean(String name) throws BeansException {

        return applicationContext.getBean(name);

    }

}

public interface UserReadService {

    public UserInfo getUserInfoById(Long id);

}

@Component("userReadService")

public class UserReadServiceImpl implements UserReadService {

    @Override

    public UserInfo getUserInfoById(Long id) {

        System.out.println("获取用户信息");

        return null;

    }

}

<?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:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

            http://www.springframework.org/schema/beans/spring-beans-4.1.xsd

            http://www.springframework.org/schema/context

            http://www.springframework.org/schema/context/spring-context-4.1.xsd">

    <context:annotation-config />

    <!--自动扫描含有@Service将其注入为bean -->

    <context:component-scan base-package="com.mycompany.yuanmeng.springdemo.aop" />

    <bean id="springContextUtil" class="com.mycompany.yuanmeng.springdemo.aop.SpringContextUtil" />

</beans>

public static void test() {

        new ClassPathXmlApplicationContext("spring.xml"); // 加载ApplicationContext（模拟启动web服务）, 当然如果是用web工程的话,可以直接在web.xml配置，容器会去加载此文件。

        UserReadService userReadService = (UserReadService) SpringContextUtil.getBean("userReadService");

        userReadService.getUserInfoById(null);

 }