flex httpservice 传递给后台java servlet中文

前台

var strUrl:String=StringUtil.trim(strFileInServerPath)+"?dowhat=add&plusPath="+StringUtil.trim(plusPath);
request = new URLRequest(encodeURI(strUrl));   

后台

plusPath = new String(request.getParameter("plusPath").getBytes(
      "ISO-8859-1"), "gbk");