<s:iterator value="cartItems">
     <tr class='td_no_bord'>
    <td>
      <a href="#"><s:property value="#item.pro.productName" /></a>
    </td>
    <td class="buy_td_5">
      <span class="c_gray"><s:property value="%{item.pro.fixedPrice}"/></span>
    </td>
    <td class="buy_td_4">
      <span><s:property value="%{item.pro.dangPrice}"/></span>
    </td>
    </tr>
</s:iterator>

================BuyAction.java(在struts.xml中有定义,根据私有属性获取值)======================
public class BuyAction  extends BaseAction{
    //input
    private int id;
    //output
    private List<CartItem> cartItems;
    private CartItem item;
    private boolean hasBook;
    
    ProductDAO pd = new JdbcProductDAO();
    CartBean cb = new CartBean();

    public String addBook(){
             item = cb.buy(id);// <----调用CartBean.java的buy()方法
        if(cartItems==null){
            cartItems = new ArrayList<CartItem>();
        }
        if(cartItems.isEmpty()){
            hasBook = false;
            cartItems.add(0, item);
        return "addInCart";
                  }

====================CartBean.java======================
public class CartBean extends BaseAction implements Cart{
    private CartItem item;
    
    public CartItem buy(int bid) {
        //根据商品pid,获取商品对象，封装成CartItem
        ProductDAO pd = new JdbcProductDAO();
        Book book = new Book();
        try {
            book = pd.getAbook(bid);//能够顺利通过JDBC获取数据库存储的数据        
            item = new CartItem(book,1,true);
             } catch (SQLException e) {
            e.printStackTrace();
                    }
              return item;
        }