static{
        String path = new Object(){
            public String getPath() {
                return this.getClass().getResource("/../../").getPath();
            }
        }.getPath();
        //path: ../项目名/
        String fullPath = path + "data/";
    }

        String baseUrl = System.getProperty("catalina.home");
        //baseUrl ../tomcat/
        String fullPath = baseUrl + "/webapps/cfservice/data/..";