MyEclipse 6.5网上书店系统

package control; import java.io.IOException; import java.io.PrintWriter; import java.util.HashMap; import java.util.Map; 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 entity.BookBean; import entity.CartItemBean; public class AddBookToCart extends HttpServlet { /** * Constructor of the object. */ public AddBookToCart() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * 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 doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @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 doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session=request.getSession(); //获取刚刚放入购物车的book BookBean books=(BookBean)session.getAttribute("bookToAdd"); //取出购物车 cart Map cart=(Map)session.getAttribute("cart"); if(cart==null) { cart=new HashMap(); //将购物车放入session中 session.setAttribute("cart",cart); } //判断此书籍是否在购物车中 CartItemBean cartItem=(CartItemBean)cart.get(books.getIsbn()); //如果书籍在购物车中，则更新数量 if(cartItem!=null) { cartItem.setQuantity(cartItem.getQuantity()+1); //否则，创建一个新条目到Map中 且设置数量为1 }else{ cart.put(books.getIsbn(),new CartItemBean(books,1)); } request.getRequestDispatcher("viewCart.jsp").forward(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }