巴巴运动商品交易系统对购物车的实现
在购物车中，我们可以删除购物项，修改产品的购买数量，清空购物车，进入结算中心。
以下是购物车的代码：
@Controller("/shopping/cart/manage")public class BuyCartManageAction extends DispatchAction {/** * 删除指定购物项 */public ActionForward delete(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {BuyCart cart = (BuyCart)WebUtil.getBuyCart(request);BuyCartForm formbean = (BuyCartForm) form;if(formbean.getProductid()!=null && formbean.getProductid()>0&& formbean.getStyleid()!=null && formbean.getStyleid()>0){ProductInfo product = new ProductInfo(formbean.getProductid());product.addProductStyle(new ProductStyle(formbean.getStyleid()));BuyItem item = new BuyItem(product);cart.delete(item);}request.setAttribute("directUrl", "/shopping/cart.do");return mapping.findForward("directUrl");}/** * 清空购物车 */public ActionForward deleteAll(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {BuyCart cart = (BuyCart)WebUtil.getBuyCart(request);cart.deleteAll();request.setAttribute("directUrl", "/shopping/cart.do");return mapping.findForward("directUrl");}/** * 修改购买数量 */public ActionForward updateAmount(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {modifyBuyAmount(request);request.setAttribute("directUrl", "/shopping/cart.do");return mapping.findForward("directUrl");}private void modifyBuyAmount(HttpServletRequest request) {BuyCart cart = (BuyCart)WebUtil.getBuyCart(request);for(BuyItem item : cart.getItems()){StringBuilder sb = new StringBuilder("amount_");sb.append(item.getProduct().getId()).append("_");sb.append(item.getProduct().getStyles().iterator().next().getId());String amount = request.getParameter(sb.toString());if(amount!=null && !"".equals(amount.trim())){item.setAmount(new Integer(amount.trim()));}}}/** * 结算 */public ActionForward settleAccounts(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {modifyBuyAmount(request);BuyCartForm formbean = (BuyCartForm) form;String url = "/customer/shopping/deliver.do";if(formbean.getDirectUrl()!=null && !"".equals(formbean.getDirectUrl())) url = formbean.getDirectUrl();request.setAttribute("directUrl", url);return mapping.findForward("directUrl");}}?清空购物车的功能就是调用了BuyCartManageAction的deleteAll()方法。删除指定购物项只需调用BuyCartManageAction的delete()方法就行了。