/**

     * 是否是Ajax异步请求

     *

     * @param request

     */

    public static boolean isAjaxRequest(HttpServletRequest request) {

        String accept = request.getHeader("accept");

        if (accept != null && accept.indexOf("application/json") != -1) {

            return true;

        }

        String xRequestedWith = request.getHeader("X-Requested-With");

        if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1) {

            return true;

        }

        String uri = request.getRequestURI();

        if (isContainStrs(uri, ".json", ".xml")) {

            return true;

        }

        String ajax = request.getParameter("__ajax");

        if (isContainStrs(ajax, "json", "xml")) {

            return true;

        }

        return false;

    }

    public static boolean isContainStrs(String str, String... strs) {

        if (str != null && strs != null) {

            for (String s : strs) {

                if (str.equalsIgnoreCase(trim(s))) {

                    return true;

                }

            }

        }

        return false;

    }

    public static String trim(String str) {

        return (str == null ? "" : str.trim());

    }