function PopupFK(cNum,type){

 	var url = "contract!Paying.action";

	url = url + "?contract.contractNum="+cNum+"&payingType="+type;

// if(isEmpty($(_this).attr("payId"))){

// url = url + "&s_paymentId="+paymentId;

// url = url + "&s_paymentDtlId="+paymentDtlId;

// }else{

// url = url + "&s_payId="+$(_this).attr("payId");

// }

	url = url+"&random="+Math.random();
　　　　 //在这里。用encodeURI进行两次转码。后台Action接收的时候。在进行一次。就不会出现乱码问题

	url = encodeURI(url);

	url = encodeURI(url);

　　var ret = window.showModalDialog(

	url,

	"",

	"dialogWidth=950px;dialogHeight=600px;center=yes;border=thick;status=no;help=no;scrollbars=no"

	);

}
下面是Action代码片段

    String cNum = contract.getContractNum();

		String Num;

		try {

			Num = URLDecoder.decode(cNum,"utf8");

			System.out.println(Num);

			c = csl.queryOneByNum(Num);

		} catch (UnsupportedEncodingException e) {

			throw new RuntimeException("合同数据错误，请联系管理员");

		}