package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import entity.itemsDAO;
import entity.Cart;
import entity.items;
public class CartServlet extends HttpServlet {
private String action ; //表示购物车的动作 ,add,show,delete
//商品业务逻辑类的对象
private itemsDAO idao = new itemsDAO();
/**
* Constructor of the object.
*/
public CartServlet() {
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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
if(request.getParameter("action")!=null)
{
this.action = request.getParameter("action");
if(action.equals("add")) //如果是添加商品进购物车
{
if(addToCart(request,response))
{
request.getRequestDispatcher("/success.jsp").forward(request, response);
}
else
{
request.getRequestDispatcher("/failure.jsp").forward(request, response);
}
}
if(action.equals("show"))//如果是显示购物车
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
if(action.equals("delete")) //如果是执行删除购物车中的商品
{
if(deleteFromCart(request,response))
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
else
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
}
}
}
//添加商品进购物车的方法
private boolean addToCart( HttpServletRequest request, HttpServletResponse response)
{
String id = request.getParameter("id");
String number = request.getParameter("num");
items item = idao.getItemsById(Integer.parseInt(id));
//是否是第一次给购物车添加商品,需要给session中创建一个新的购物车对象
if(request.getSession().getAttribute("cart")==null)
{
Cart cart = new Cart();
request.getSession().setAttribute("cart",cart);
}
Cart cart = (Cart)request.getSession().getAttribute("cart");
if(cart.CartAdd(item, Integer.parseInt(number)))
{
return true;
}
else
{
return false;
}
}
//从购物车中删除商品
private boolean deleteFromCart(HttpServletRequest request, HttpServletResponse response){
String id = request.getParameter("id");
Cart cart = (Cart) request.getSession().getAttribute("cart");
items it = idao.getItemsById(Integer.parseInt(id));
System.out.println(it.getName());
if(cart.CartRemove(it))
{
return true;
}
else
{
return false;
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%@ page import="entity.Cart" %>
<%@ page import="entity.items" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'cart.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<link type="text/css" rel="stylesheet" href="css/style1.css" />
<script language="javascript">
function delcfm() {
if (!confirm("确认要删除？")) {
window.event.returnValue = false;
}
}
</script>
</head>
<body>
<h1>我的购物车</h1>
<a href="index.jsp">首页</a> >> <a href="index.jsp">商品列表</a>
<hr>
<div id="shopping">
<form action="" method="">
<table>
<tr>
<th>商品名称</th>
<th>商品单价</th>
<th>商品价格</th>
<th>购买数量</th>
<th>操作</th>
</tr>
<%
//首先判断session中是否有购物车对象
if(request.getSession().getAttribute("cart")!=null)
{
%>
<!-- 循环的开始 -->
<%
Cart cart = (Cart)request.getSession().getAttribute("cart");
HashMap<items,Integer> goods = cart.getGoods();
Set<items> items = goods.keySet();
Iterator<items> it = items.iterator();
while(it.hasNext())
{
items i = it.next();
%>
<tr name="products" id="product_id_1">
<td class="thumb"><img src="images/<%=i.getPicture()%>" /><a href=""><%=i.getName()%></a></td>
<td class="number"><%=i.getPrice() %></td>
<td class="price" id="price_id_1">
<span><%=i.getPrice()*goods.get(i) %></span>
<input type="hidden" value="" />
</td>
<td class="number">
<%=goods.get(i)%>
</td>
<td class="delete">
<a href="servlet/CartServlet?action=delete&id=<%=i.getId()%>" onclick="delcfm();">删除</a>
</td>
</tr>
<%
}
%>
<!--循环的结束-->
</table>
<div class="total"><span id="total">总计：<%=cart.CartTotal() %>￥</span></div>
<%
}
%>
<div class="button"><input type="submit" value="" /></div>
</form>
</div>
</body>
</html>
package entity;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
//购物车类
public class Cart {
private HashMap<items, Integer> goods; //商品类和数量集合
private double total;//商品总价
//构造方法
public Cart(){
goods = new HashMap<items, Integer>();
total = 0.0;
}
public HashMap<items, Integer> getGoods() {
return goods;
}
public void setGoods(HashMap<items, Integer> goods) {
this.goods = goods;
}
public double getTotal() {
return total;
}
public void setTotal(double total) {
this.total = total;
}
//添加商品和商品数量进购物车 的方法
public boolean CartAdd(items i,int n){
if(goods.containsKey(i)){
goods.put(i, goods.get(i)+n);
}else{
goods.put(i, n);
}
CartTotal();//每次添加后重新计算总价格
return true;
}
//删除商品的方法
public boolean CartRemove(items i){
goods.remove(i);
CartTotal();//每次删除后重新计算总价格
return true;
}
//统计购物车内物品的总价格
public double CartTotal(){
double d = 0.0;
Set<items> keys = goods.keySet();//获取键值对集合
Iterator<items> it = keys.iterator();//获得迭代器对象
while (it.hasNext()){
items i = it.next();
d += i.getPrice()* goods.get(i);
}
this.setTotal(d);
return this.getTotal(); //返回总价格
}
// public static void main(String[] args) {
// //先创建两个商品对象
// items t1 = new items(1,"沃特篮球鞋","温州",200,500,"001.jpg");
// items t2 = new items(2,"李宁运动鞋","广州",300,500,"002.jpg");
// items t3 = new items(1,"沃特篮球鞋","温州",200,500,"001.jpg");
//
// //实例化购物车类
// Cart c = new Cart();
// c.CartAdd(t1, 3);
// c.CartAdd(t2, 1);
// c.CartAdd(t3, 1);
// c.CartRemove(t1);
// //遍历购物车商品类集合
// Set<Map.Entry<items, Integer>> items = c.getGoods().entrySet();
// for(Map.Entry<items, Integer> obj: items){
// System.out.println(obj);
// }
//
// System.out.println("商品总价为："+c.getTotal());
//
// }
}
检查以下点删除按钮是的提交路径，在Cart.jsp代码里面
<td class="delete">
<a href="servlet/CartServlet?action=delete&id=<%=i.getId()%>" onclick="delcfm();">删除</a>
</td>