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

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

 

2.servlet层

(1）OrderServlet.java 

    /**
     * 确认订单
     * @param req
     * @param resp
     * @return
     * @throws ServletException
     * @throws IOException
     */
    public String confirm(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String id = req.getParameter("oid");
        int status = service.findStatus(id);
        
        if(status != 3) {
            req.setAttribute("code", "error");
            req.setAttribute("msg", "态不对，不能确认收货！");
            return "f:/jsps/msg.jsp";
        }
        service.updateStatus(id, 4);
        req.setAttribute("code", "success");
        req.setAttribute("msg", "恭喜，交易成功！");
        return "f:/jsps/msg.jsp";    
    }
    
    /**
     * 取消收货
     * @param req
     * @param resp
     * @return
     * @throws ServletException
     * @throws IOException
     */
    public String cancel(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String id = req.getParameter("oid");
        int status = service.findStatus(id);
        
        if(status != 1) {
            req.setAttribute("code", "error");
            req.setAttribute("msg", "状态不对，不能取消！");
            return "f:/jsps/msg.jsp";
        }
        service.updateStatus(id, 5);
        req.setAttribute("code", "success");
        req.setAttribute("msg", "您的订单已取消！");
        return "f:/jsps/msg.jsp";    
    }

3.service层

(1）OrderService.java  

    /**
     * 修改订单状态
     * @param id
     * @param status
     */
    public void updateStatus(String id, int status) {
        try {
            dao.updateStatus(id, status);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 查找订单状态
     * @param id
     * @return
     */
    public int findStatus(String id) {
        try {
            return dao.findStatus(id);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

4.dao层

(1）OrderDao.java

    /**
     * 修改订单状态
     * @param id
     * @param status
     * @throws SQLException
     */
    public void updateStatus(String id, int status) throws SQLException {
        String sql = "update t_order set status=? where oid=?";
        qr.update(sql, status, id);
    }
    
    /**
     * 查找订单状态
     * @param id
     * @return
     * @throws SQLException
     */
    public int findStatus(String id) throws SQLException {
        String sql = "select status from t_order where oid=?";
        Number status = (Number) qr.query(sql, new ScalarHandler(), id);
        return status.intValue();
    }