网上图书商城项目学习笔记-021取消订单确认收货

一、流程分析

二、代码

1.view层

(1）desc.jsp

1 <c:if test="${order.status eq 1 }">
2     <a href="<c:url value='/OrderServlet?method=prePay&oid=${order.oid }'/>" class="pay"></a><br/>
3 </c:if>    
4 <c:if test="${order.status eq 1 and btn eq 'cancel' }">
5     <a id="cancel" href="<c:url value='/OrderServlet?method=cancel&oid=${order.oid }'/>">取消订单</a><br/>
6 </c:if>
7 <c:if test="${order.status eq 3 and btn eq 'confirm' }">
8     <a id="confirm" href="<c:url value='/OrderServlet?method=confirm&oid=${order.oid }'/>">确认收货</a><br/>
9 </c:if>

2.servlet层

(1）OrderServlet.java

 1     /**
 2      * 确认订单
 3      * @param req
 4      * @param resp
 5      * @return
 6      * @throws ServletException
 7      * @throws IOException
 8      */
 9     public String confirm(HttpServletRequest req, HttpServletResponse resp)
10             throws ServletException, IOException {
11         String id = req.getParameter("oid");
12         int status = service.findStatus(id);
13         
14         if(status != 3) {
15             req.setAttribute("code", "error");
16             req.setAttribute("msg", "态不对，不能确认收货！");
17             return "f:/jsps/msg.jsp";
18         }
19         service.updateStatus(id, 4);
20         req.setAttribute("code", "success");
21         req.setAttribute("msg", "恭喜，交易成功！");
22         return "f:/jsps/msg.jsp";    
23     }
24     
25     /**
26      * 取消收货
27      * @param req
28      * @param resp
29      * @return
30      * @throws ServletException
31      * @throws IOException
32      */
33     public String cancel(HttpServletRequest req, HttpServletResponse resp)
34             throws ServletException, IOException {
35         String id = req.getParameter("oid");
36         int status = service.findStatus(id);
37         
38         if(status != 1) {
39             req.setAttribute("code", "error");
40             req.setAttribute("msg", "状态不对，不能取消！");
41             return "f:/jsps/msg.jsp";
42         }
43         service.updateStatus(id, 5);
44         req.setAttribute("code", "success");
45         req.setAttribute("msg", "您的订单已取消！");
46         return "f:/jsps/msg.jsp";    
47     }

3.service层

(1）OrderService.java

 1     /**
 2      * 修改订单状态
 3      * @param id
 4      * @param status
 5      */
 6     public void updateStatus(String id, int status) {
 7         try {
 8             dao.updateStatus(id, status);
 9         } catch (SQLException e) {
10             throw new RuntimeException(e);
11         }
12     }
13 
14     /**
15      * 查找订单状态
16      * @param id
17      * @return
18      */
19     public int findStatus(String id) {
20         try {
21             return dao.findStatus(id);
22         } catch (SQLException e) {
23             throw new RuntimeException(e);
24         }
25     }

4.dao层

(1）OrderDao.java

 1     /**
 2      * 修改订单状态
 3      * @param id
 4      * @param status
 5      * @throws SQLException
 6      */
 7     public void updateStatus(String id, int status) throws SQLException {
 8         String sql = "update t_order set status=? where oid=?";
 9         qr.update(sql, status, id);
10     }
11     
12     /**
13      * 查找订单状态
14      * @param id
15      * @return
16      * @throws SQLException
17      */
18     public int findStatus(String id) throws SQLException {
19         String sql = "select status from t_order where oid=?";
20         Number status = (Number) qr.query(sql, new ScalarHandler(), id);
21         return status.intValue();
22     }