Ajax驗證

import javax.servlet.http.HttpServletRequest; import org.slf4j.Logger; import org.slf4j.LoggerFactory;   public class AjaxUtil {   private static final Logger LOGGER = LoggerFactory.getLogger(AjaxUtil.class);     public static boolean checkIsAjax(HttpServletRequest request)   {     String requestType = request.getHeader("x-requested-with");     boolean isAjax = false;     if ((requestType != null) && (requestType.equals("XMLHttpRequest"))) {       isAjax = true;     }       request.setAttribute("isAjax", Boolean.valueOf(isAjax));     return isAjax;   } }