1 案例分析

1 订单分析1

2 订单分析2

3 订单的业务操作

2 代码实现

1 cart.jsp代码修改

<a href="${pageContext.request.contextPath }/product?method=submitOrder">
     <input type="button" width="100" value="提交订单" name="submit" border="0" style="background: url(‘./images/register.gif‘) no-repeat scroll 0 0 rgba(0, 0, 0, 0);
      height:35px;width:100px;color:white;"></a>

2 ProductServlet代码

//提交订单
public void submitOrder(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    HttpSession session = request.getSession();

    //判断用户是否已经登录 未登录下面代码不执行
    User user = (User) session.getAttribute("user");
    if(user==null){
        //没有登录
        response.sendRedirect(request.getContextPath()+"/login.jsp");
        return;
    }

    //目的：封装好一个Order对象 传递给service层
    Order order = new Order();

    //1、private String oid;//该订单的订单号
    String oid = CommonsUtils.getUUID();
    order.setOid(oid);

    //2、private Date ordertime;//下单时间
    order.setOrdertime(new Date());

    //3、private double total;//该订单的总金额
    //获得session中的购物车
    Cart cart = (Cart) session.getAttribute("cart");
    double total = 0.0;
    if(cart!=null){
        total = cart.getTotal();
    }
    order.setTotal(total);

    //4、private int state;//订单支付状态 1代表已付款 0代表未付款
    order.setState(0);

    //5、private String address;//收货地址
    order.setAddress(null);

    //6、private String name;//收货人
    order.setName(null);

    //7、private String telephone;//收货人电话
    order.setTelephone(null);

    //8、private User user;//该订单属于哪个用户
    order.setUser(user);

    //9、该订单中有多少订单项List<OrderItem> orderItems = new ArrayList<OrderItem>();
    //获得购物车中的购物项的集合map
    Map<String, CartItem> cartItems = cart.getCartItems();
    for(Map.Entry<String, CartItem> entry : cartItems.entrySet()){
        //取出每一个购物项
        CartItem cartItem = entry.getValue();
        //创建新的订单项
        OrderItem orderItem = new OrderItem();
        //1)private String itemid;//订单项的id
        orderItem.setItemid(CommonsUtils.getUUID());
        //2)private int count;//订单项内商品的购买数量
        orderItem.setCount(cartItem.getBuyNum());
        //3)private double subtotal;//订单项小计
        orderItem.setSubtotal(cartItem.getSubtotal());
        //4)private Product product;//订单项内部的商品
        orderItem.setProduct(cartItem.getProduct());
        //5)private Order order;//该订单项属于哪个订单
        orderItem.setOrder(order);

        //将该订单项添加到订单的订单项集合中
        order.getOrderItems().add(orderItem);
    }

    //order对象封装完毕
    //传递数据到service层
    ProductService service = new ProductService();
    service.submitOrder(order);

    session.setAttribute("order", order);

    //页面跳转
    response.sendRedirect(request.getContextPath()+"/order_info.jsp");

}

3 ProductService代码

//提交订单 将订单的数据和订单项的数据存储到数据库中
public void submitOrder(Order order) {

    ProductDao dao = new ProductDao();

    try {
        //1、开启事务
        DataSourceUtils.startTransaction();
        //2、调用dao存储order表数据的方法
        dao.addOrders(order);
        //3、调用dao存储orderitem表数据的方法
        dao.addOrderItem(order);

    } catch (SQLException e) {
        try {
            DataSourceUtils.rollback();
        } catch (SQLException e1) {
            e1.printStackTrace();
        }
        e.printStackTrace();
    } finally {
        try {
            DataSourceUtils.commitAndRelease();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

4 ProductDao代码

//向orders表插入数据
public void addOrders(Order order) throws SQLException {
    QueryRunner runner = new QueryRunner();
    String sql = "insert into orders values(?,?,?,?,?,?,?,?)";
    Connection conn = DataSourceUtils.getConnection();
    runner.update(conn,sql, order.getOid(),order.getOrdertime(),order.getTotal(),order.getState(),
            order.getAddress(),order.getName(),order.getTelephone(),order.getUser().getUid());
}

//向orderitem表插入数据
public void addOrderItem(Order order) throws SQLException {
    QueryRunner runner = new QueryRunner();
    String sql = "insert into orderitem values(?,?,?,?,?)";
    Connection conn = DataSourceUtils.getConnection();
    List<OrderItem> orderItems = order.getOrderItems();
    for(OrderItem item : orderItems){
        runner.update(conn,sql,item.getItemid(),item.getCount(),item.getSubtotal(),item.getProduct().getPid(),item.getOrder().getOid());
    }
}

5 order_info.jsp修改代码

<table class="table table-bordered">
    <tbody>
        <tr class="warning">
            <th colspan="5">订单编号:${order.oid }</th>
        </tr>
        <tr class="warning">
            <th>图片</th>
            <th>商品</th>
            <th>价格</th>
            <th>数量</th>
            <th>小计</th>
        </tr>

        <c:forEach items="${order.orderItems }" var="orderItem">

            <tr class="active">
                <td width="60" width="40%">
                    <img src="${pageContext.request.contextPath }/${orderItem.product.pimage}" width="70" height="60">
                </td>
                <td width="30%"><a target="_blank">${orderItem.product.pname}</a></td>
                <td width="20%">￥${orderItem.product.shop_price}</td>
                <td width="10%">${orderItem.count}</td>
                <td width="15%"><span class="subtotal">￥${orderItem.subtotal }</span></td>
            </tr>
        </c:forEach>
    </tbody>
</table>

原文地址：https://www.cnblogs.com/jepson6669/p/8448025.html