cartaction.java

shoppingCar 购物车

package com.tarena.shoppingcar.action;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.actions.LookupDispatchAction;

import com.tarena.shoppingcar.entity.Cart;
import com.tarena.shoppingcar.entity.Item;
import com.tarena.shoppingcar.entity.User;

public class CartAction extends LookupDispatchAction {

	@Override
	protected Map getKeyMethodMap() {
		Map<String, String> map = new HashMap<String, String>();
		map.put("submit.modify", "modifyNumber");
		map.put("submit.delete", "deleteSelectedItem");
		map.put("submit.clear", "clear");
		map.put("submit.over", "spend");
		map.put("submit.buy", "buy");
		return map;
	}

	public ActionForward modifyNumber(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		HttpSession session = request.getSession();
		Cart car = (Cart) session.getAttribute("car");

		for (Integer i : car.getItems().keySet()) {
			Item item = car.getItems().get(i);
			String id = i.toString();
			int amount = Integer.parseInt(request.getParameter(id));
			item.setAmount(amount);
			car.modifyItemNumber(item);
		}
		session.setAttribute("car", car);
		return mapping.findForward("success");
	}

	public ActionForward deleteSelectedItem(ActionMapping mapping,
			ActionForm form, HttpServletRequest request,
			HttpServletResponse response) throws Exception {

		ActionForward forward = mapping.findForward("success");
		HttpSession session = request.getSession();
		Cart car = (Cart) session.getAttribute("car");
		try {
			HashMap<Integer, Item> items = car.getItems();
			Set<Integer> set = items.keySet();
			Set<Integer> ii = new HashSet<Integer>();
			// 迭代找出要删除的定单项item
			for (Integer a : set) {
				Item item = items.get(a);
				String pname = item.getProduct().getPname();
				System.out
						.println(pname + "====" + request.getParameter(pname));
				if (request.getParameter(pname) != null) {
					ii.add(a);
					// car.removeItemByProductId(a);
				}
			}
			// 迭代删除找出的定单项item
			for (Integer i : ii) {
				car.removeItemByProductId(i);
			}
		} catch (Exception e) {
			e.printStackTrace();
			forward = mapping.findForward("error");
		}
		session.setAttribute("car", car);
		return forward;
	}

	public ActionForward clear(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		HttpSession session = request.getSession();
		Cart car = (Cart) session.getAttribute("car");
		car.clear();
		session.setAttribute("car", car);
		return mapping.findForward("success");
	}

	public ActionForward spend(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			Cart car = (Cart) session.getAttribute("car");
			User user = (User) session.getAttribute("user");
			if (car == null || car.isEmpty()) {
				forward = mapping.findForward("message");
			} else if (user == null) {
				String path = request.getServletPath();
				session.setAttribute("path", path);
				forward = mapping.findForward("login");
			} else {
				forward = mapping.findForward("order");
			}
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("product.spend"));
			forward = mapping.findForward("error");
		}

		return forward;
	}
	public ActionForward buy(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		ActionForward forward = mapping.findForward("buy");
		return forward;
	}

	private ActionMessages getMessages(String key) {
		ActionMessages errors = new ActionMessages();
		ActionMessage message = new ActionMessage(key);
		errors.add("error", message);
		return errors;
	}
}