异步验证电话号码是否已经存在数据库(jquery)

前台jsp页面：

	function docheck(){
	    var cellno = document.getElementById("filterNo").value;
	    var cellno2 = cellno.trim();
		var reg_tel = /^1[3-9]{1}\d{9}$/; 
		if(!reg_tel.test(cellno2)){
			showAlert(cellno+"不是合法手机号码");
			$("#advice").html("");
		    $("#filterNo").focus();
	        $("#filterNo").addClass("lpm");
			return false;
		}
		var urlStr = "<%=basepath %>/smsfilter/smsFilter-check.action";
		$.ajax( {
			type : "POST",
			url : urlStr,
			data : "cellno="+cellno2,
			success : executeCheck	// 回调函数
		});
	}
	
	// 回调函数
	function executeCheck(ss) { 
	if(ss=="1"){
	    $("#advice").html("<p>该手机号码已在黑名单中</p>");
	    $("#filterNo").focus();
	    $("#filterNo").addClass("lpm");
	}else{
	$("#advice").html("");
	document.forms[0].submit();
	}
          }

 action类：

@Namespace("/smsfilter")
public class SmsFilterAction extends BaseAction{

@Action(value="smsFilter-check",
		    results={@Result(name="add",location="smsFilter-add.jsp")})
	public String check()throws Exception {
		HttpSession session = getHttpRequest().getSession();
		TEnterpriseInfo entInfo = (TEnterpriseInfo)session.getAttribute("entInfo");
		TUserTeInfo userinfo = (TUserTeInfo)session.getAttribute("userInfo");
		
		int userId = Integer.parseInt(userinfo.Id) ;
		int entId = Integer.parseInt(entInfo.Id);
		
		String telno=getHttpRequest().getParameter("cellno");  //获得jsp页面的cellno的值
		SmsfilterServiceInter tsi = ServiceFactory.getSmsfilterService();
		
		try{
			int check = tsi.getSmsFiltersCheck(userId, entId,telno);
			PrintWriter pw=getHttpResponse().getWriter();
			pw.print(check);
		}catch(Exception e){
			e.printStackTrace();
		}
		return null;
	}
	
}

service层的方法：

	public int getSmsFiltersCheck(int userId, int entId,String telno) throws Exception
	{
		SmsfilterDao sdaoc = new SmsfilterDao();
		return sdaoc.getSmsFiltersCheck(userId, entId, telno);
	}

dao层的方法:

	public int getSmsFiltersCheck(int userId,int entId,String telno) throws Exception{
		String hql="from Smsfilter f where f.userId="+userId+" and f.entId="+entId+" and f.smsTelNo='"+telno+"'";
		List list=query(hql);
		if(list==null){
			return 0;
		}else{
			return 1;
		}
		
   }