JAVA项目---电子书店项目源代码

package com.oristand.demo.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.HashMap; import java.util.Iterator; 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 com.oristand.demo.entity.Book; import com.oristand.demo.entity.CartItem; 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 { //not complete Simple show process response.setContentType("text/html"); HttpSession session=request.getSession(false); Book book=(Book)session.getAttribute("addBook"); //HashMap<String, CartItem> cart=new HashMap<String, CartItem>();//cart Object HashMap<String, CartItem> cart=(HashMap<String, CartItem>)session.getAttribute("cart"); if(cart==null){ cart=new HashMap<String, CartItem>(); } //first method // CartItem item=null; // if(cart.containsKey(book.getISBN()+"")) // { // item=cart.get(book.getISBN()+""); // item.setQuantity(item.getQuantity()+1); // }else{ // item=new CartItem(book,1); // } // cart.put(book.getISBN()+"", item); // //second method CartItem item=cart.get(book.getISBN()+""); if(item==null){ cart.put(book.getISBN()+"", new CartItem(book,1)); }else{ item.setQuantity(item.getQuantity()+1); } session.setAttribute("cart", cart); //request.getRequestDispatcher("/viewCart.jsp").forward(request, response); response.sendRedirect("viewCart.jsp"); } /** * 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 { doGet(request, response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }