jsp+js购物车源码

package web; import java.io.IOException; 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.CookieUtils; import bean.Cart; import bean.CartItem; import dao.impl.ComputerDAOImpl; import entity.Computer; public class ShoppingServlet extends HttpServlet { public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); String uri = request.getRequestURI(); String action = uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf(".")); if(action.equals("/list")){ System.out.println("do list"); ComputerDAOImpl dao = new ComputerDAOImpl(); List<Computer> computers = dao.findll(); request.setAttribute("computers", computers); request.getRequestDispatcher("computer_list2.jsp").forward(request,response); return; } if(action.equals("/buy")){ String id = request.getParameter("id"); HttpSession session = request.getSession(); Cart cart = (Cart) session.getAttribute("cart"); if(cart==null){ cart = new Cart(); session.setAttribute("cart", cart); } ComputerDAOImpl dao = new ComputerDAOImpl(); Computer c = dao.findById(new Long(id)); CartItem item = new CartItem(); item.setComputer(c); item.setQty(1); boolean flag = cart.add(item); if(!flag){ request.setAttribute("info_" + c.getId(), "已经购买了该产品！"); } CookieUtils.addCookie(response, "cart", cart.store()); request.getRequestDispatcher("list.do").forward(request,response); return; } if(action.equals("/update")){ String id = request.getParameter("id"); int num = Integer.parseInt(request.getParameter("num")); System.out.println("id:" + id + " num:" + num); HttpSession session = request.getSession(); Cart cart = (Cart) session.getAttribute("cart"); cart.modify(new Long(id),num); CookieUtils.addCookie(response, "cart", cart.store()); request.getRequestDispatcher("cart2.jsp").forward(request,response); } if(action.equals("/delete")){ String id = request.getParameter("id"); HttpSession session = request.getSession(); Cart cart = (Cart) session.getAttribute("cart"); cart.delete(new Long(id)); CookieUtils.deleteCookie(response, "cart"); request.getRequestDispatcher("cart.jsp").forward(request,response); } if(action.equals("/clear")){ HttpSession session = request.getSession(); Cart cart = (Cart) session.getAttribute("cart"); cart.clear(); CookieUtils.deleteCookie(response, "cart2"); request.getRequestDispatcher("cart2.jsp").forward(request,response); } } }