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SSM购物车之购物车模块day04

阅读目录

1.SQL
2.实体类
3.Mapper层（dao）
4.Service（业务层）
5.Controller（控制层）
6.jsp页面

购买行为就是创建一条一条的订单项
而显示购物车，也就是把这些订单项显示在页面上。

在这个阶段，订单项都会保存在session中，直到最后生成订单的时候，才会把这些订单项保存在数据库中。

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1.SQL

暂时不需要为OrderItem创建表，因为在这个环节OrderItem还是保存在Session中的

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2.实体类

 1 package cn.gb.pojo;
 2 
 3 public class OrderItem {
 4     private String  id;
 5     private Product product;
 6     private Order order;
 7     private int num;
 8 
 9     public Order getOrder() {
10         return order;
11     }
12 
13     public void setOrder(Order order) {
14         this.order = order;
15     }
16 
17     public String getId() {
18         return id;
19     }
20 
21     public void setId(String id) {
22         this.id = id;
23     }
24 
25     public Product getProduct() {
26         return product;
27     }
28 
29     public void setProduct(Product product) {
30         this.product = product;
31     }
32 
33     public int getNum() {
34         return num;
35     }
36 
37     public void setNum(int num) {
38         this.num = num;
39     }
40 }

View Code

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3.Mapper层（dao）

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4.Service（业务层）

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5.Controller（控制层）

1. 获取购买数量
2. 获取购买商品的id
3. 根据id获取商品对象
4. 创建一个新的OrderItem对象
5. 从session中取出一个List , 这个List里面存放陆续购买的商品。
如果是第一次从session中获取该List,那么它会是空的，需要创建一个ArrayList
6. 把新创建的OrderItem对象放入该List 中
7. 跳转到显示购物车的listOrderItem

当加入相同的商品时-----------

遍历session中所有的OrderItem
如果找到对应的product.id一样的条目，就调整其数量
如果没有找到，就新增加一条

 1 package cn.gb.controller;
 2 
 3 import cn.gb.pojo.OrderItem;
 4 import cn.gb.pojo.Product;
 5 import cn.gb.service.ProductService;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.http.HttpRequest;
 8 import org.springframework.stereotype.Controller;
 9 import org.springframework.ui.Model;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.ResponseBody;
12 
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpSession;
15 import java.util.ArrayList;
16 import java.util.List;
17 
18 @Controller
19 @RequestMapping("cart")
20 public class CartController {
21     @Autowired
22     private ProductService productService;
23 
24     @RequestMapping("showCart")
25     public String showCart( HttpSession session, Model model){
26         List<OrderItem> ois= (List<OrderItem>)session.getAttribute("carts");
27         if (null!=ois){
28             model.addAttribute("ois",ois);
29         }
30         return "/cart.jsp";
31     }
32 
33     @RequestMapping("addCart")
34     @ResponseBody
35     public String addCart(String pid,String num,HttpSession session){
36         OrderItem oi=new OrderItem();
37         Product product=productService.info(pid);
38         oi.setNum(Integer.parseInt(num));
39         oi.setProduct(product);
40         List<OrderItem> itemList= (List<OrderItem>) session.getAttribute("carts");
41         if (null==itemList){
42             itemList=new ArrayList<>();
43             session.setAttribute("carts",itemList);
44         }
45         boolean found=false;
46         for (OrderItem orderItem : itemList){
47             if (orderItem.getProduct().getId()==oi.getProduct().getId()){
48                 orderItem.setNum(orderItem.getNum()+oi.getNum());
49                 found=true;
50                 break;
51             }
52         }
53         if (!found)
54            itemList.add(oi);
55         return "true";
56     }
57 }

View Code

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6.jsp页面

加入

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2021/2/2 0002
  Time: 10:24
  To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
    <script src="${pageContext.request.contextPath}/js/jquery-1.11.3.min.js"/>
    <script src="${pageContext.request.contextPath}/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap.min.css">
</head>
<script>
    $(function () {
        $(".addBtn").click(function () {
            var button=$(this);
            var pid=$(this).attr("pid");
           /* alert(pid);*/
            var number=$(".number[pid="+pid+"]").val();
            /*alert(number);*/
            $.ajax({
                url:"${pageContext.request.contextPath}/cart/addCart.action",
                data:{"pid":pid,"num":number},
                success:function (result) {
                   window.location.href="/cart/showCart.action"
                }
            })
        })
    })
</script>
<body>
<jsp:include page="header.jsp"/>
<table class="table table-striped table-bordered"
       style="width: 500px;margin: 44px auto" border="1" align="center" cellspacing="0">
    <tr>
        <td>编号</td>
        <td>名称</td>
        <td>价格</td>
        <td>购买</td>
    </tr>
    <c:forEach items="${list}" var="pro">
        <tr>
            <td>${pro.id}</td>
            <td>${pro.name}</td>
            <td>${pro.price}</td>
            <td>
                数量<input pid="${pro.id}" type="text" class="number" value="1" name="num">
                <input type="submit" pid="${pro.id}" class="addBtn" value="购买">
            </td>
        </tr>
    </c:forEach>
</table>
<jsp:include page="footer.jsp"/>
</body>
</html>

展示　　

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2021/2/3 0003
  Time: 11:15
  To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         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" %>
<html>
<head>
    <title>Title</title>
    <script src="${pageContext.request.contextPath}/js/jquery-1.11.3.min.js"/>
    <script src="${pageContext.request.contextPath}/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap.min.css">
</head>
<form id="orderForm"
      style="margin-top: 5px; margin-left: 150px;"
      action="${pageContext.request.contextPath}/order/saveOrder.action" method="post">
<table class="table table-striped table-bordered"
       style="width: 400px;margin: 44px auto" border="1" align="center" cellspacing="0">
    <tr>
        <td>商品名称</td>
        <td>单价</td>
        <td>数量</td>
        <td>小计</td>
    </tr>
    <c:forEach var="oi" items="${ois}">
        <tr>
            <td>${oi.product.name}</td>
            <td>${oi.product.price}</td>
            <td>${oi.num}</td>
            <td><fmt:formatNumber minFractionDigits="1" value="${oi.product.price*oi.num}"></fmt:formatNumber></td>
        </tr>
    </c:forEach>
    <c:if test="${!empty ois}">
        <tr>
            <td colspan="5" align="right">
                <a href="javascript:document.getElementById('orderForm').submit();">
                    <img src="${pageContext.request.contextPath}/image/finalbutton.gif" width="204" height="51"
                         border="0" />
                </a>
            </td>
        </tr>
    </c:if>
</table>
</form>
<nav>
 
</nav>
</body>
</html>