前端页面获取web根路径

        String basePath = request.getScheme() + "://" + request.getServerName();        if (request.getServerPort() != 80) {            basePath += ":" + request.getServerPort();        }        basePath += request.getContextPath();        request.setAttribute("basePath", basePath);        request.setAttribute("requestURI", request.getRequestURI());