Spring 获取bean 工具类

上代码：

@Component
public class SpringContextUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    /**
     * @param beanName bean名称
     * @Description: 获取spring容器中的bean, 通过bean名称获取
     * @return: Object 返回Object,需要做强制类型转换
     */
    public static Object getBean(String beanName) {
        return applicationContext.getBean(beanName);
    }

    /**
     * @param beanClass bean 类型
     * @Description: 获取spring容器中的bean, 通过bean类型获取
     * @return: T 返回指定类型的bean实例
     */
    public static <T> T getBean(Class<T> beanClass) {
        return applicationContext.getBean(beanClass);
    }

    /**
     * @param beanName  bean 名称
     * @param beanClass bean 类型
     * @Description: 获取spring容器中的bean, 通过bean名称和bean类型精确获取
     * @return: T 返回指定类型的bean实例
     */
    public static <T> T getBean(String beanName, Class<T> beanClass) {
        return applicationContext.getBean(beanName, beanClass);
    }

}