shoppingaction.java

shoppingCar 购物车

package com.tarena.shoppingcar.action;

import java.util.List;

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.MappingDispatchAction;

import com.tarena.shoppingcar.biz.ProductBiz;
import com.tarena.shoppingcar.biz.UserBiz;
import com.tarena.shoppingcar.entity.Cart;
import com.tarena.shoppingcar.entity.Item;
import com.tarena.shoppingcar.entity.Product;
import com.tarena.shoppingcar.entity.User;
import com.tarena.shoppingcar.util.PaginationInfo;

public class ShoppingAction extends MappingDispatchAction {
	private ProductBiz pb = new ProductBiz();

	private UserBiz ub = new UserBiz();

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

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = new PaginationInfo();
			info.setRowPerPage(6);
			int rowCount = pb.getRowCount();
			info.setRowCount(rowCount);
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			session.setAttribute("info", info);
			forward = mapping.findForward("productList");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("product.list"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

		ActionForward forward = null;
		try {
			String userName = request.getParameter("userName");
			String password = request.getParameter("password");
			if (userName == null || userName.trim().length() == 0
					|| password == null || password.trim().length() == 0) {
				return mapping.findForward("login");
			}
			User user = ub.find(userName, password);
			if (user != null) {
				HttpSession session = request.getSession();
				session.setAttribute("user", user);
				String path = (String) session.getAttribute("path");
				if (path == null) {
					forward = mapping.findForward("success");
				} else {
					forward = mapping.findForward("back");
				}
			} else {
				forward = mapping.findForward("login");
			}
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("user.login"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			String path = request.getContextPath();
			session.setAttribute("path", path);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("user.cartLogin"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			if (session.getAttribute("car") == null) {
				Cart car = new Cart();
				session.setAttribute("car", car);
			}
			int id = Integer.parseInt(request.getParameter("id"));
			Product product = pb.findById(id);
			Item item = new Item();
			item.addProduct(product);
			Cart car = (Cart) session.getAttribute("car");
			car.addItem(item);
			session.setAttribute("car", car);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("product.add"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

	//分页显示
	//第一页
	public ActionForward firstPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			info.firstPage();
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("page.first"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

	//最后一页
	public ActionForward lastPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			info.lastPage();
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("page.last"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

	//下一页
	public ActionForward nextPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			info.nextPage();
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("page.next"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

	//上一页
	public ActionForward previousPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			info.previousPage();
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("page.previous"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

	public ActionForward gotoPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			String pageNo = request.getParameter("pageNo");
			info.gotoPage(Integer.parseInt(pageNo));
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("page.goto"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			PaginationInfo info = (PaginationInfo) session.getAttribute("info");
			int currentPage = info.getCurrentPage();
			info.gotoPage(currentPage);
			List<Product> products = pb.findByPage(info.getStartRow(), info
					.getRowPerPage());
			request.setAttribute("products", products);
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("system.center"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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

		ActionForward forward = null;
		try {
			HttpSession session = request.getSession();
			session.invalidate();
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
			saveErrors(request, getMessages("user.logout"));
			forward = mapping.findForward("error");
		}
		return forward;
	}

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