URL传参中文乱码、点链接弹出子窗口

String ssdwhbm = new String(getRequest().getParameter("ssdwhbm").getBytes("iso8859-1"),"utf-8");

<a href="javaScript:void(0)"  onclick="paixu(‘${l.ssdwhbm}‘)" >排序</a>

<script type="text/javascript">
　　function paixu(ssdwhbm){
    　　var winoption ="dialogHeight:700px;dialogWidth:600px;status:no;scroll:yes;resizable:no;center:yes";
   　　 var obj = ‘‘;
       window.showModalDialog("${ctx}/perInfoCollection_getPerInfoColListPx.do?ssdwhbm="+encodeURI(encodeURI(ssdwhbm))+"&t="+new Date().getTime(),obj,winoption);
   }
</script>

String ssdwhbm = URLDecoder.decode(getRequest().getParameter("ssdwhbm"),"utf-8");