判断逻辑

    protected boolean isAjaxRequest(HttpServletRequest request) {
        if (request.getHeader("X-Requested-With") != null 
        		&& "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"))) {
            return true;
        }
        return false;
    }
        protected void ajaxResponse(HttpServletResponse response) {
    	PrintWriter writer = null;
        try {
            writer = response.getWriter();
            writer.write("{\"message\":\"NotLogin\", \"success\":false}");
        } catch (Exception var12) {
            log.error("--ajaxResponse error--", var12);
        } finally {
            if (writer != null) {
                try {
                    writer.close();
                } catch (Exception var11) {
                    log.error("--ajaxResponse close writer error--", var11);
                }
            }

        }
    }