刪除沒有反應
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 ; //表示購物車的動作 ,add,show,delete
//商品業(yè)務邏輯類的對象
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")) //如果是添加商品進購物車
{
if(addToCart(request,response))
{
request.getRequestDispatcher("/success.jsp").forward(request, response);
}
else
{
request.getRequestDispatcher("/failure.jsp").forward(request, response);
}
}
if(action.equals("show"))//如果是顯示購物車
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
if(action.equals("delete")) //如果是執(zhí)行刪除購物車中的商品
{
if(deleteFromCart(request,response))
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
else
{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
}
}
}
//添加商品進購物車的方法
private boolean addToCart( HttpServletRequest request, HttpServletResponse response)
{
String id = request.getParameter("id");
String number = request.getParameter("num");
items item = idao.getItemsById(Integer.parseInt(id));
//是否是第一次給購物車添加商品,需要給session中創(chuàng)建一個新的購物車對象
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;
}
}
//從購物車中刪除商品
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("確認要刪除？")) {
? ? ? ? ? ?window.event.returnValue = false;
? ? ? ?}
? ?}
? ?</script>
? </head>
??
? <body>
? ?<h1>我的購物車</h1>
? ?<a href="index.jsp">首頁</a> >> <a href="index.jsp">商品列表</a>
? ?<hr>?
? ?<div id="shopping">
? ?<form action="" method="">
<table>
<tr>
<th>商品名稱</th>
<th>商品單價</th>
<th>商品價格</th>
<th>購買數(shù)量</th>
<th>操作</th>
</tr>
<%?
? //首先判斷session中是否有購物車對象
? if(request.getSession().getAttribute("cart")!=null)
? {
%>
<!-- 循環(huán)的開始 -->
? ? <%?
? ? ? ? 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();">刪除</a> ? ? ? ? ? ? ? ? ?
</td>
</tr>
? ? <%?
? ? ? ? }
? ? %>
<!--循環(huán)的結束-->
</table>
<div class="total"><span id="total">總計：<%=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;
//購物車類
public class Cart {
private HashMap<items, Integer> goods; //商品類和數(shù)量集合
private double total;//商品總價
//構造方法
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;
}
//添加商品和商品數(shù)量進購物車 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();//每次添加后重新計算總價格
return ?true;
}
//刪除商品的方法
public boolean CartRemove(items i){
goods.remove(i);
CartTotal();//每次刪除后重新計算總價格
return true;
}
//統(tǒng)計購物車內物品的總價格
public double CartTotal(){
double d = 0.0;
Set<items> keys = goods.keySet();//獲取鍵值對集合
Iterator<items> it = keys.iterator();//獲得迭代器對象
while (it.hasNext()){
items i = it.next();
d += i.getPrice()* goods.get(i);
}
this.setTotal(d);
return this.getTotal(); //返回總價格
}
// public static void main(String[] args) {
// //先創(chuàng)建兩個商品對象
// items t1 = new items(1,"沃特籃球鞋","溫州",200,500,"001.jpg");
// items t2 = new items(2,"李寧運動鞋","廣州",300,500,"002.jpg");
// items t3 = new items(1,"沃特籃球鞋","溫州",200,500,"001.jpg");
//
// //實例化購物車類
// Cart c = new Cart();
// c.CartAdd(t1, 3);
// c.CartAdd(t2, 1);
// c.CartAdd(t3, 1);
// c.CartRemove(t1);
// //遍歷購物車商品類集合
// Set<Map.Entry<items, Integer>> items = ?c.getGoods().entrySet();
// for(Map.Entry<items, Integer> obj: items){
// System.out.println(obj);
// }
//
// System.out.println("商品總價為："+c.getTotal());
//
// }
}
2016-10-07
檢查以下點刪除按鈕是的提交路徑，在Cart.jsp代碼里面
<td class="delete">
?<a href="servlet/CartServlet?action=delete&id=<%=i.getId()%>" onclick="delcfm();">刪除</a> ? ? ? ? ? ? ? ?
</td>