通过实现ApplicationContextAware接口动态获取bean

package com.winner.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * Spring的工具类，用来获得配置文件中的bean
 */
@Component
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    /**
     *  当继承了ApplicationContextAware类之后，那么程序在调用 getBean(String)的时候会自动调用该方法，
     * 不用自己操作
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtils.applicationContext = applicationContext;
    }

    /***
     * 根据一个bean的id获取配置文件中相应的bean
     */
    public static Object getBean(String beanId) throws BeansException {
        if (applicationContext.containsBean(beanId)) {
            applicationContext.getBean(beanId);
        }
        return null;
    }

    /***
     * 根据一个bean的类型获取配置文件中相应的bean
     */
    public static <T> T getBeanByClass(Class<T> requiredType) throws BeansException {
        return applicationContext.getBean(requiredType);
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    public static ApplicationContext getApplicationContext() {
        return SpringContextUtils.applicationContext;
    }
}

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.2.5.RELEASE</version>
</dependency>