ApplicaitonContextUtil

import java.io.IOException;   import org.apache.commons.lang3.Validate; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.DisposableBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.annotation.Lazy; import org.springframework.core.io.DefaultResourceLoader; import org.springframework.stereotype.Service;   /**   * 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.   *   * @author Zaric   * @date 2013-5-29 下午1:25:40   */ @Service @Lazy ( false ) public class SpringContextHolder implements ApplicationContextAware, DisposableBean {        private static ApplicationContext applicationContext = null ;        private static Logger logger = LoggerFactory.getLogger(SpringContextHolder. class );        /**       * 取得存储在静态变量中的ApplicationContext.       */      public static ApplicationContext getApplicationContext() {          assertContextInjected();          return applicationContext;      }        public static String getRootRealPath() {          String rootRealPath = "" ;          try {              rootRealPath = getApplicationContext().getResource( "" ).getFile().getAbsolutePath();          } catch (IOException e) {              logger.warn( "获取系统根目录失败" );          }          return rootRealPath;      }        public static String getResourceRootRealPath() {          String rootRealPath = "" ;          try {              rootRealPath = new DefaultResourceLoader().getResource( "" ).getFile().getAbsolutePath();          } catch (IOException e) {              logger.warn( "获取资源根目录失败" );          }          return rootRealPath;      }        /**       * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.       */      @SuppressWarnings ( "unchecked" )      public static <T> T getBean(String name) {          assertContextInjected();          return (T) applicationContext.getBean(name);      }        /**       * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.       */      public static <T> T getBean(Class<T> requiredType) {          assertContextInjected();          return applicationContext.getBean(requiredType);      }        /**       * 清除SpringContextHolder中的ApplicationContext为Null.       */      public static void clearHolder() {          if (logger.isDebugEnabled()) {              logger.debug( "清除SpringContextHolder中的ApplicationContext:" + applicationContext);          }          applicationContext = null ;      }        /**       * 实现ApplicationContextAware接口, 注入Context到静态变量中.       */      @Override      public void setApplicationContext(ApplicationContext applicationContext) {          SpringContextHolder.applicationContext = applicationContext;      }        /**       * 实现DisposableBean接口, 在Context关闭时清理静态变量.       */      @Override      public void destroy() throws Exception {          SpringContextHolder.clearHolder();      }        /**       * 检查ApplicationContext不为空.       */      private static void assertContextInjected() {          Validate.validState(applicationContext != null , "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder." );      } }