关于读取Structs里ActionMapping里forward问题！

下面是Action 里Execute方法
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
PorductQueryForm porductQueryForm = (PorductQueryForm) form;

 try
 {
 DataSource sqlDataSource=getDataSource(request,"BDH_sqlServer");
 Connection sqlConnection=sqlDataSource.getConnection();
 Fill fill=new Fill(sqlConnection);
 porductQueryForm.SetTradeList(fill.tradeList);//设置FORM LIST
 porductQueryForm.SetRateList(fill.rateList);//设置FORM LIST
 porductQueryForm.SetgoodsList(fill.goodsNameList);//设置FORM LIST
 porductQueryForm.SetSpecification(fill.specificationList);//设置FoRM LIST
 porductQueryForm.SetPackageList(fill.PackageList);//设置FORM LIST
 mapping.findForward("porductQuery");

 
 }
 catch(SQLException er)
 {
 System.out.print(er.toString());
 
 
 }

    
return null;
}
我想导航到ActionMapping配置文件里forward项 这里怎么写！