获取路径

request.getSession().getServletContext().getRealPath("/");

this.getClass().getClassLoader().getResource("").getPath();

public static String getRealWebappsPath(HttpServletRequest request) {
    String webPath = request.getSession().getServletContext().getRealPath(
            "/");
    String basePath = webPath.substring(0, webPath.indexOf(request
            .getContextPath().substring(1)));
    return basePath;
}