主要根据http header里的属性x-requested-with进行判断：

//判断是否ajax请求
publicstaticbooleanisAjaxRequest(HttpServletRequestrequest){
if(request.getHeader("x-requested-with")!=null&&request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")){
returntrue;
}
returnfalse;
}