不通过servlet获取webRoot途径

不通过servlet获取webRoot路径
第一种实现

URL url = ClassLoader.getSystemClassLoader().getResource("./");File file = new File(url.getPath());File parentFile = new File(file.getParent());System.out.println("webRoot:"+parentFile.getParent());

public class Lisiter implment ServletContextListener{   /*通过实现ServletContextAware可获得servletContext*/     private static ServletContext servletContext;      @Overridepublic void contextInitialized(ServletContextEvent arg) {this.servletContext=arg.getServletContext();} }

<listener>        <listener-class>cn.com.besttone.manage.service.impl.TimeSettleServiceImpl</listener-class> </listener>