/**
 * 设值全局变量
 * @author meikai
 * @version 2017年10月23日 下午2:15:19
 */
public class PropertyListenter implements ServletContextListener {

 /* (non-Javadoc)
  * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
  */
 @Override
 public void contextDestroyed(ServletContextEvent arg0) {
  // TODO Auto-generated method stub

 }

 /* (non-Javadoc)
  * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
  */
 @Override
 public void contextInitialized(ServletContextEvent sce) {
  
  
  /**
   * 读取properties文件
   * 
   */
  final Logger logger = (Logger) LoggerFactory.getLogger(PropertyListenter.class);
  
  Properties properties = new Properties(); 
  
  InputStream in = null;
  try {
   //通过类加载器进行获取properties文件流
   in = PropertiesUtil.class.getClassLoader().getResourceAsStream("kenhome-common.properties");   
   properties.load(in);
   
  } catch (FileNotFoundException e) {
   logger.error("未找到properties文件");
  } catch (IOException e) {
   logger.error("发生IOException异常");
  } finally {
   try {
    if(null != in) {
     in.close();
    }
   } catch (IOException e) {
    logger.error("properties文件流关闭出现异常");
   }
  }
      
  
  /**
   * 将properties文件转存到map
   */
  Map<String, String> pros = new HashMap<String,String>((Map)properties);
  
  /**
   * 将Map通过ServletContext存储到全局作用域中
   */
  ServletContext sct=sce.getServletContext(); 
  
  sct.setAttribute("pros", pros);

 }
 

}

<!-- 全局变量监听器，读取properties文件，设值为全局变量 -->
 <listener>
  <listener-class>com.meikai.listener.PropertyListenter</listener-class>
 </listener>