配置springmvc在其他类中（spring容器外）获取注入bean-白红宇

学习https://github.com/thinkgem/jeesite

今天在写JedisUtils的时候要注入JedisPool，而这个属性被设置为static，@Resource和@Autowired都不可以注入，因为spring不能为静态变量依赖注入。因此需要额外的方法获取spring管理的bean。本文即SpringContextHolder：

1 package com.demo.common.utils; 2  3 import org.apache.commons.lang3.Validate; 4 import org.slf4j.Logger; 5 import org.slf4j.LoggerFactory; 6 import org.springframework.beans.BeansException; 7 import org.springframework.beans.factory.DisposableBean; 8 import org.springframework.context.ApplicationContext; 9 import org.springframework.context.ApplicationContextAware;10 import org.springframework.context.annotation.Lazy;11 import org.springframework.stereotype.Service;12 13 /**14  * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext.15  * Created by Administrator on 2016/2/23.16  */17 @Service18 @Lazy(false)19 public class SpringContextHolder implements ApplicationContextAware ,DisposableBean {20     private static ApplicationContext applicationContext = null;21     private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);22 23     /**24      * 去的存储在静态变量中的ApplicationContext25      * @return26      */27     public static ApplicationContext getApplicationContext(){28         assertContextInjected();29         return applicationContext;30     }31 32     /**33      * 从静态变量applicationContext中去的Bean，自动转型为所复制对象的类型34      * @param name35      * @param 
     
      36      * @return37      */38     public static 
      
        T getBean(String name){39         assertContextInjected();40         return (T)applicationContext.getBean(name);41     }42 43     /**44      * 从静态变量applicationContext中去的Bean，自动转型为所复制对象的类型45      * @param requiredType46      * @param 
       
        47      * @return48      */49     public static 
        
          T getBean(Class
         
           requiredType){50         assertContextInjected();51         return (T)applicationContext.getBean(requiredType);52     }53 54     /**55      * 清楚SpringContextHolder中的ApplicationContext为Null56      */57     public static void clearHolder(){58         if(logger.isDebugEnabled()){59             logger.debug("清楚SpringContextHolder中的ApplicationContext:"+applicationContext);60         }61         applicationContext = null;62     }63 64 65     /**66      * 检查ApplicationContext不为空67      */68     private static void assertContextInjected() {69         Validate.validState(applicationContext!=null,"applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");70     }71 72     /**73      * 实现ApplicationContextAware接口，注入Context到静态变量74      * @param applicationContext75      * @throws BeansException76      */77     @Override78     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {79         SpringContextHolder.applicationContext = applicationContext;80     }81 82     /**83      * 实现DisposableBean接口，在Context关闭时清理静态变量84      * @throws Exception85      */86     @Override87     public void destroy() throws Exception {88         SpringContextHolder.clearHolder();89     }90 }

唯有不断学习方能改变！ --

Ryan Miao