SpringContextUtil spring上下文獲取工具類

package com.midea.biz;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.util.Assert;

public class SpringContextUtil implements ApplicationContextAware{
    
     private static ApplicationContext applicationContext;
     
        /**
         * 實現ApplicationContextAware接口的context注入函數, 將其存入靜態變量.
         */
        @Override
        public void setApplicationContext(ApplicationContext applicationContext)
                throws BeansException {
            SpringContextUtil.applicationContext = applicationContext;
        }
     
        /**
         * 取得存儲在靜態變量中的ApplicationContext.
         */
        public static ApplicationContext getContext() {
            checkApplicationContext();
            return applicationContext;
        }
     
        /**
         * 從靜態變量ApplicationContext中取得Bean, 自動轉型為所賦值對象的類型.
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(String name) {
            checkApplicationContext();
            return (T) applicationContext.getBean(name);
        }
     
        /**
         * 從靜態變量ApplicationContext中取得Bean, 自動轉型為所賦值對象的類型.
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(Class<T> clazz) {
            checkApplicationContext();
            return (T) applicationContext.getBeansOfType(clazz);
        }
     
        private static void checkApplicationContext() {
            Assert.notNull(applicationContext,
                    "applicaitonContext未注入,請在applicationContext.xml中定義SpringContextUtil");
        }

}