sc.rar_java card

package web; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import util.CookieUtil; import bean.Cart; import dao.ComputerDAO; import entity.Computer; public class ShoppingServlet extends HttpServlet { /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String uri = request.getRequestURI(); String path = uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf(".")); if(path.equals("/list")){ ComputerDAO dao = new ComputerDAO(); List<Computer> computers; try { computers = (List<Computer>)dao.findAll(); request.setAttribute("computers", computers); request.getRequestDispatcher("computer_list.jsp") .forward(request, response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); throw new ServletException(e); } }else if(path.equals("/buy")){ long id = Long.parseLong(request.getParameter("id")); HttpSession session = request.getSession(); Cart cart = (Cart)session.getAttribute("cart"); if(cart==null){ cart = new Cart(); try { cart.load(CookieUtil.findCookie("cart", request)); session.setAttribute("cart", cart); } catch (NumberFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { if(!cart.addItem(id)){ request.setAttribute("buy_error"+id, "已经购买"); request.getRequestDispatcher("list.do") .forward(request, response); } String content = cart.store(); CookieUtil.addCookie("cart", content, response); response.sendRedirect("list.do"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }else if(path.equals("/del")){ long id = Long.parseLong(request.getParameter("id")); HttpSession session = request.getSession(); Cart cart = (Cart)session.getAttribute("cart"); cart.delete(id); String content = cart.store(); CookieUtil.addCookie("cart", content, response); response.sendRedirect("cart.jsp"); }else if(path.equals("/clear")){ HttpSession session = request.getSession(); Cart cart = (Cart)session.getAttribute("cart"); cart.clear(); String content = cart.store(); CookieUtil.addCookie("cart", content, response); response.sendRedirect("cart.jsp"); }else if(path.equals("/update")){ int qty = Integer.parseInt(request.getParameter("qty")); long id = Long.parseLong(request.getParameter("id")); HttpSession session = request.getSession(); Cart cart = (Cart)session.getAttribute("cart"); cart.update(id, qty); String content = cart.store(); CookieUtil.addCookie("cart", content, response); response.sendRedirect("cart.jsp"); } } }