jsp学习笔记（25）

ShoppingServlet代码如下：package servlet.user;import java.io.IOException;import java.util.ArrayList;import javax.servlet.RequestDispatcher;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.Validate;import bean.Cart;import bean.CartItem;public class ShoppingServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {Validate validate = new Validate();String pathStr = "";String method = validate.getUnicode(request.getParameter("method"));String bookId = validate.getUnicode(request.getParameter("bookId"));String bookName = validate.getUnicode(request.getParameter("bookName"));String bookQuantityStr = request.getParameter("bookQuantity");String bookPriceStr = request.getParameter("bookPrice");int bookQuantity =0;double bookPrice = 0.0d;if(bookQuantityStr!=null)bookQuantity = Integer.parseInt(bookQuantityStr);if(bookPriceStr!=null)bookPrice= Double.parseDouble(bookPriceStr);HttpSession session = request.getSession();ArrayList login = (ArrayList) session.getAttribute("login");if(login == null || login.equals("")){pathStr="/user/error.jsp";} else {pathStr = "/user/cart.jsp";CartItem cartItem = new CartItem();cartItem.setId(bookId);cartItem.setName(bookName);cartItem.setQuantity(bookQuantity);cartItem.setPrice(bookPrice);Cart cart = (Cart)session.getAttribute("cart");if(cart==null)cart = new Cart();//添加书籍到购物车if("add".equals(method)){cart.addCartItem(cartItem);}//根据id删除书籍else if("delete".equals(method)){cart.removeCartItem(bookId);}//修改指定书籍的数量else if("update".equals(method)){int updateBookQuantity = Integer.parseInt(request.getParameter("updateBookQuantity"+bookId));cart.updateCartItem(bookId, updateBookQuantity);}//清空购物车else if("removeAll".equals(method)){cart.clearCart();}session.setAttribute("cart", cart);}RequestDispatcher rd = request.getRequestDispatcher(pathStr);rd.forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}