mysql 数据库，如果信息存在调出，如果不存在转到另一个jsp中
如题，如果product数据库中有查询的内容，forward到search.jsp, 如果product数据库中没有查询的数据，forward到noproduct.jsp

怎么改写这里，每次都是不能显示noproduct.jsp

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {

ActionForward forward = null; 


Connection con = null;;  
Statement st = null;  
HttpSession session = request.getSession();
SearchitemForm searchitemForm = (SearchitemForm) form;
String search = searchitemForm.getSearch();
String strSql = "select * from product where product='" + search + "';";
ResultSet rsLogon = null;  
try{  
 
DataSource dataSource = getDataSource(request,"datasource");  
con = dataSource.getConnection();  
st = con.createStatement();  
rsLogon = st.executeQuery(strSql); 
 
ArrayList a=new ArrayList();

while(rsLogon.next()){ 
String Product=rsLogon.getString("product");
String Price=rsLogon.getString("price");
String Description=rsLogon.getString("description");
String Barcode = rsLogon.getString("barcode");
Product m=new Product();
m.setProduct(Product);
m.setPrice(Price);
m.setDescription(Description);
m.setBarcode(Barcode);
a.add(m);
 
}

session.setAttribute("b", a);
  forward = mapping.findForward("search"); 
 
}
catch(SQLException e){
System.out.println(e.getMessage());
}
return forward;

 

}
}

------解决方案--------------------
判断得到的数据行数，然后判断一下是否大于0，跳到指定页面即可！
------解决方案--------------------
判断下rsLogon的size，为0跳转提示页。