jsp电子商务购物车实现之三购物车

来源：互联网发布：app源码网站编辑：程序博客网时间：2024/04/29 01:11

CartServlet参考代码 :

public void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {String bookids[] = req.getParameterValues("bookId"); //id数组;Map<Integer,Book> cart = (Map<Integer,Book>)req.getSession().getAttribute("cart");//System.out.println(cart.size()); null对/* *     Integer   Book *     id        book  (count)        *     7         book  （count=2） *     8         book  ( count=5) *  * */BookDao bd = new BookDaoImpl();//如果购物车为null，则new出来一个HashMap对象if(cart==null){cart = new HashMap<Integer,Book>();//id以及book对象req.getSession().setAttribute("cart", cart);}for(String bookid:bookids){Book book = cart.get(Integer.parseInt(bookid));if(book==null){book = bd.findById(Integer.parseInt(bookid));//根据id获得书籍book.setCount(1);//数量为1}else{// 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if(book.getStock()>book.getCount()){book.setCount(book.getCount()+1);}}cart.put(Integer.parseInt(bookid), book);//需要放入到数据库中,那么购物车表的字段是什么呢？//图书id 书名  图片名 数量 合计价格}req.getSession().setAttribute("cart", cart);resp.sendRedirect("cart.jsp");}

在该Servlet中利用了session进行存放值，就是开篇我们的方法之一，但是这种方法有什么问题呢？大家好好思考下！！！

下面是购物车代码参考：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><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" href="css/style.css" type="text/css"></link>    <script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>    <script type="text/javascript">  function jian(id){if($("#count"+id).val()==1){//采用淘宝模式，如果低于1，则不用提示，直接不可用;$("#count"+id).prev().attribute("disabled","disabled");return;}    $.ajax({  url:'ChangeCartCountServlet',  type:'post',  dataType:'text',  data:{  bookid:id,  count:parseInt($("#count"+id).val())-1   //  -1  },  success:function(data){   var price = $("#price"+id).html();  $("#count"+id).val(parseInt($("#count"+id).val())-1);  $("#sum"+id).val("￥"+price*$("#count"+id).val());    calcTotal();    }  });  }    function add(id){  $.ajax({  url:'ChangeCartCountServlet',  type:'post',  dataType:'text',  data:{  bookid:id,  count:parseInt($("#count"+id).val())+1  },  success:function(data){  if(data=="false"){  alert("库存不足!!!!");  }  else{  var price = $("#price"+id).html();  $("#count"+id).val(parseInt($("#count"+id).val())+1);  $("#sum"+id).val("￥"+price*$("#count"+id).val());    calcTotal();  }  }  });          }    function calcTotal(){  // input...  var counts = $("input[id^=count]").toArray();    var prices = $("div[id^=price]").toArray();  var total = 0;    for(var i=0;i<prices.length;i++){  total += prices[i].innerHTML*counts[i].value;  }    $("#total").val("￥"+total);  }    </script>    </head>    <body>   <div id="header" class="wrap"><div id="banner"></div><div id="navbar"><div class="userMenu"><ul><li class="current"><font color="BLACK">欢迎您，<strong>andy</strong></font>   </li><li><a href="index.html">首页</a></li><li><a href="orderlist.html">我的订单</a></li><li><a href="cart.html">购物车</a></li><li><a href="logout.jsp">注销</a></li></ul></div></div></div><div id="content" class="wrap"><div class="list bookList"><form method="post" name="shoping" action="BuyServlet"><table><tr class="title"><th class="view">图片预览</th><th>书名</th><th class="nums">数量</th><th class="price">价格</th><th class="nums">合计</th><th class="nums">操作</th></tr><c:set var="total" value="0"></c:set><c:forEach items="${cart}" var="book"><tr><td class="thumb"><img src="images/book/${book.value.image}" /></td><td class="title">${book.value.bookname}</td><td><img src="images/edit_jian.png" width="12" height="12" onclick="jian(${book.value.id})"/><input id="count${book.value.id}" readonly="readonly"value="${book.value.count}" size="2"/><img src="images/edit_add.png" width="12" height="12"     onclick="add(${book.value.id})"/></td><td>￥<div id="price${book.value.id}" >${book.value.price}</div></td><td><input id="sum${book.value.id}"value='<fmt:formatNumber value="${book.value.count*book.value.price}"type="currency"></fmt:formatNumber>'/><c:set var="total" value="${total+book.value.count*book.value.price}"></c:set><input type="hidden" name="items" value="10:2:31.6"/></td><td><a href="DeleteCartItemServlet?bookid=${book.value.id}">删除</a></td></tr></c:forEach><tr><td>地址</td><td colspan="5"><input name="shipaddress"></td></tr><tr><td>电话</td><td colspan="5"><input name="contactphone"></td></tr><tr><td colspan="5"><div class="button"><h4>总价：<input id="total" value='<fmt:formatNumber value="${total}" type="currency"></fmt:formatNumber>'/>元</h4><input type="hidden" id="hidden_total_price" name="hidden_total_price"/><input class="input-chart" type="submit" name="submit" value="" /></div></td></tr></table></form></div></div></body><div id="footer" class="wrap">网上书城 &copy; 版权所有</div></html> </html>

根据id从购物车中删除的Servlet代码参考如下：

protected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {int bookid = Integer.parseInt(req.getParameter("bookid"));Map<Integer,Book> cart = (Map<Integer,Book>)req.getSession().getAttribute("cart");// 根据key(bookid)删除cart.remove(bookid);req.getSession().setAttribute("cart", cart);resp.sendRedirect("cart.jsp");}

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jsp电子商务 购物车实现之三 购物车

jsp电子商务购物车实现之三购物车