altercartaction.java

一个很不错的网上小型购物系统

package action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import service.CartService;
import domain.LineItem;

public class AlterCartAction extends Action {
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		String productId = request.getParameter("id");
		String numStr = request.getParameter("num");
		if (productId != null && numStr != null) {
			CartService cartService = (CartService) request.getSession()
					.getAttribute("CartService");
			LineItem li = cartService.loadLineItem(productId);
			int num = Integer.parseInt(numStr);
			if (num <= 0) {
				cartService.removeLineItem(li);
			} else {
				li.setNum(num);
				cartService.alterLineItem(li);
			}
		}
		ActionForward forward = new ActionForward("/showCart.do");
		forward.setRedirect(true);
		return forward;
	}
}