网上图书商城项目学习笔记-026添加一级分类

一、流程分析

二、代码

1.view层

(1）add.jsp

 1     <script type="text/javascript">
 2         function checkForm() {
 3             if(!$("#cname").val()) {
 4                 alert("分类名不能为空！");
 5                 return false;
 6             }
 7             if(!$("#desc").val()) {
 8                 alert("分类描述不能为空！");
 9                 return false;
10             }
11             return true;
12         }
13     </script>
14 <style type="text/css">
15     body {background: rgb(254,238,189);}
16 </style>
17   </head>
18   
19   <body>
20     <h3>添加1级分类</h3>
21     <h1></h1>
22     <p style="font-weight: 900; color: red">${msg }</p>
23     <form action="<c:url value='/admin/AdminCategoryServlet'/>" method="post" onsubmit="return checkForm()">
24         <input type="hidden" name="method" value="addParent"/>
25         分类名称：<input type="text" name="cname" id="cname"/><br/>
26         分类描述：<textarea rows="5" cols="50" name="desc" id="desc"></textarea><br/>
27         <input type="submit" value="添加一级分类"/>
28         <input type="button" value="返回" onclick="history.go(-1)"/>
29     </form>
30   </body>
31 </html>

 

2.servlet层

(1）AdminCategoryServlet.java 

 1     /**
 2      * 添加父级
 3      * @param req
 4      * @param resp
 5      * @return
 6      * @throws ServletException
 7      * @throws IOException
 8      */
 9     public String addParent(HttpServletRequest req, HttpServletResponse resp)
10             throws ServletException, IOException {
11         Category parent = CommonUtils.toBean(req.getParameterMap(), Category.class);
12         parent.setCid(CommonUtils.uuid());
13         service.add(parent);
14         return findAll(req, resp);
15     }

 

3.service层

(1）AdminCategoryService.java 

 1     /**
 2      * 添加分类
 3      * @param category
 4      */
 5     public void add(Category category) {
 6         try {
 7             categoryDao.add(category);
 8         } catch (SQLException e) {
 9             throw new RuntimeException(e);
10         }
11     }

 

4.dao层

(1）AdminCategoryDao.java

 1     /**
 2      * 添加分类
 3      * @param category
 4      * @throws SQLException
 5      */
 6     public void add(Category category) throws SQLException {
 7         String pid = null;
 8         if(category.getParent() != null) {
 9             pid = category.getParent().getCid();
10         }
11         String sql = "insert into t_category(cid, cname, pid, `desc`) values (?,?,?,?)";
12         Object [] params = {category.getCid(), category.getCname(), pid, category.getDesc()};
13         qr.update(sql, params);
14     }

 

posted @ 2016-02-04 14:00  shamgod  阅读(474)  评论(0)  编辑  收藏  举报
haha