Spring IOC上下文工具類

@Component
public class SpringUtil implements ApplicationContextAware {

    /**
     * 當前IOC
     */
    private static ApplicationContext applicationContext;

    /**
     * 設置當前上下文環境，此方法由spring自動裝配
     */
    @Override
    public void setApplicationContext(ApplicationContext arg0) throws BeansException {
        SpringUtil.applicationContext = arg0;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 從當前IOC獲取bean
     * @param id  bean的id
     * @return
     */
    public static Object getObject(String id) {
        return applicationContext.getBean(id);
    }

    /**
     * 從當前IOC獲取bean
     * @param id  bean的id
     * @return
     * @return
     * @return
     */
    public static <T> T getObject(String id,Class<T> c) {
        return applicationContext.getBean(id,c);
    }

    /**
     * 通過類型獲取第一個實例
     */
    public static <T> T getBeanByType(Class<T> c) {
        return applicationContext.getBean(c);
    }
}