jsp电子商务 购物车实现之三 购物车
【摘要】
CartServlet参考代码 :
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String bookids[] = req.getParameterVa...
CartServlet参考代码 :
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public void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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String bookids[] = req.getParameterValues("bookId"); //id数组;
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Map<Integer,Book> cart = (Map<Integer,Book>)req.getSession().getAttribute("cart");
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//System.out.println(cart.size()); null对
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/*
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* Integer Book
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* id book (count)
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* 7 book （count=2）
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* 8 book ( count=5)
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*
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* */
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BookDao bd = new BookDaoImpl();
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//如果购物车为null，则new出来一个HashMap对象
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if(cart==null){
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cart = new HashMap<Integer,Book>();//id以及book对象
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req.getSession().setAttribute("cart", cart);
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}
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for(String bookid:bookids){
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Book book = cart.get(Integer.parseInt(bookid));
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if(book==null){
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book = bd.findById(Integer.parseInt(bookid));//根据id获得书籍
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book.setCount(1);//数量为1
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}
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else{
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// 判断是否已经是最后一本书;数量大于获得数量,其他的不能再加数量了
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if(book.getStock()>book.getCount()){
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book.setCount(book.getCount()+1);
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}
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}
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cart.put(Integer.parseInt(bookid), book);
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//需要放入到数据库中,那么购物车表的字段是什么呢？
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//图书id 书名 图片名 数量 合计价格
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}
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req.getSession().setAttribute("cart", cart);
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resp.sendRedirect("cart.jsp");
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}
下面是购物车代码参考：
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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>My JSP 'cart.jsp' starting page</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<link rel="stylesheet" href="css/style.css" type="text/css"></link>
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<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
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<script type="text/javascript">
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function jian(id){
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if($("#count"+id).val()==1){
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//采用淘宝模式，如果低于1，则不用提示，直接不可用;
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$("#count"+id).prev().attribute("disabled","disabled");
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return;
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}
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$.ajax({
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url:'ChangeCartCountServlet',
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type:'post',
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dataType:'text',
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data:{
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bookid:id,
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count:parseInt($("#count"+id).val())-1 // -1
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},
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success:function(data){
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var price = $("#price"+id).html();
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$("#count"+id).val(parseInt($("#count"+id).val())-1);
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$("#sum"+id).val("￥"+price*$("#count"+id).val());
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calcTotal();
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}
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});
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}
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function add(id){
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$.ajax({
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url:'ChangeCartCountServlet',
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type:'post',
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dataType:'text',
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data:{
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bookid:id,
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count:parseInt($("#count"+id).val())+1
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},
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success:function(data){
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if(data=="false"){
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alert("库存不足!!!!");
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}
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else{
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var price = $("#price"+id).html();
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$("#count"+id).val(parseInt($("#count"+id).val())+1);
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$("#sum"+id).val("￥"+price*$("#count"+id).val());
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calcTotal();
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}
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}
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});
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}
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function calcTotal(){
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// input...
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var counts = $("input[id^=count]").toArray();
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var prices = $("div[id^=price]").toArray();
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var total = 0;
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for(var i=0;i<prices.length;i++){
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total += prices[i].innerHTML*counts[i].value;
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}
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$("#total").val("￥"+total);
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}
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</script>
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</head>
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<body>
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<div id="header" class="wrap">
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<div id="banner"></div>
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<div id="navbar">
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<div class="userMenu">
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<ul>
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<li class="current"><font color="BLACK">欢迎您，<strong>andy</strong></font> </li>
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<li><a href="index.html">首页</a></li>
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<li><a href="orderlist.html">我的订单</a></li>
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<li><a href="cart.html">购物车</a></li>
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<li><a href="logout.jsp">注销</a></li>
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</ul>
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</div>
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</div>
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</div>
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<div id="content" class="wrap">
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<div class="list bookList">
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<form method="post" name="shoping" action="BuyServlet">
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<table>
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<tr class="title">
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<th class="view">图片预览</th>
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<th>书名</th>
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<th class="nums">数量</th>
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<th class="price">价格</th>
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<th class="nums">合计</th>
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<th class="nums">操作</th>
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</tr>
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<c:set var="total" value="0"></c:set>
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<c:forEach items="${cart}" var="book">
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<tr>
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<td class="thumb">
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<img src="images/book/${book.value.image}" /></td>
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<td class="title">${book.value.bookname}</td>
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<td>
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<img src="images/edit_jian.png" width="12" height="12"
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οnclick="jian(${book.value.id})"/>
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<input id="count${book.value.id}" readonly="readonly"
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value="${book.value.count}" size="2"/>
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<img src="images/edit_add.png" width="12" height="12"
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οnclick="add(${book.value.id})"/>
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</td>
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<td>￥
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<div id="price${book.value.id}" >${book.value.price}</div>
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</td>
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<td>
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<input id="sum${book.value.id}"
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value='<fmt:formatNumber
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value="${book.value.count*book.value.price}"
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type="currency"></fmt:formatNumber>'
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/>
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<c:set var="total"
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value=
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"${total+book.value.count*book.value.price}"></c:set>
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<input type="hidden" name="items" value="10:2:31.6"/>
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</td>
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<td>
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<a href="DeleteCartItemServlet?bookid=${book.value.id}">删除</a>
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</td>
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</tr>
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</c:forEach>
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<tr>
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<td>
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地址
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</td>
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<td colspan="5">
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<input name="shipaddress">
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</td>
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</tr>
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<tr>
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<td>
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电话
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</td>
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<td colspan="5">
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<input name="contactphone">
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</td>
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</tr>
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<tr><td colspan="5">
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<div class="button">
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<h4>总价：
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<input id="total"
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value='<fmt:formatNumber value="${total}" type="currency"></fmt:formatNumber>'
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/>
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元</h4>
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<input type="hidden" id="hidden_total_price" name="hidden_total_price"/>
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<input class="input-chart" type="submit" name="submit" value="" />
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</div>
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</td></tr>
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</table>
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</form>
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</div>
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</div>
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</body>
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<div id="footer" class="wrap">
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网上书城 © 版权所有
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</div>
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</html>
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</html>
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protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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int bookid = Integer.parseInt(req.getParameter("bookid"));
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Map<Integer,Book> cart = (Map<Integer,Book>)
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req.getSession().getAttribute("cart");
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// 根据key(bookid)删除
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cart.remove(bookid);
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req.getSession().setAttribute("cart", cart);
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resp.sendRedirect("cart.jsp");
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}
文章来源: aaaedu.blog.csdn.net，作者：tea_year，版权归原作者所有，如需转载，请联系作者。
原文链接：aaaedu.blog.csdn.net/article/details/53455484
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