一、流程分析
二、代码
1.view层
(1）list.jsp
1 <c:forEach items="${parents }" var="parent"> 2 <tr class="trOneLevel"> 3 <td width="200px;">${parent.cname }</td> 4 <td>${parent.desc }</td> 5 <td width="200px;"> 6 <a href="<c:url value='/admin/AdminCategoryServlet?method=addChildPre&pid=${parent.cid }'/>">添加二级分类</a> 7 <a href="<c:url value='/admin/AdminCategoryServlet?method=editParentPre&cid=${parent.cid }'/>">修改</a> 8 <a onclick="return confirm('您是否真要删除该一级分类？')" href="<c:url value='/admin/AdminCategoryServlet?method=deleteParent&cid=${parent.cid }'/>">删除</a> 9 </td> 10 </tr> 11 <c:forEach items="${parent.children }" var="child"> 12 <tr class="trTwoLevel"> 13 <td>${child.cname }</td> 14 <td>J${child.desc }</td> 15 <td width="200px;" align="right"> 16 <a href="<c:url value='/admin/AdminCategoryServlet?method=editChildPre&cid=${child.cid }'/>">修改</a> 17 <a onclick="return confirm('您是否真要删除该二级分类？')" href="<c:url value='/admin/AdminCategoryServlet?method=deleteChild&cid=${child.cid }'/>">删除</a> 18 </td> 19 </tr> 20 </c:forEach> 21 </c:forEach>
(2)edit.jsp
1 <script type="text/javascript" src="<c:url value='/jquery/jquery-1.5.1.js'/>"></script> 2 <script type="text/javascript"> 3 function checkForm() { 4 if(!$("#cname").val()) { 5 alert("分类名不能为空！"); 6 return false; 7 } 8 if(!$("#desc").val()) { 9 alert("分类描述不能为空！"); 10 return false; 11 } 12 return true; 13 } 14 </script> 15 <style type="text/css"> 16 body {background: rgb(254,238,189);} 17 </style> 18 </head> 19 20 <body> 21 <h3>修改1级分类</h3> 22 <h1></h1> 23 <p style="font-weight: 900; color: red">${msg }</p> 24 <form action="<c:url value='/admin/AdminCategoryServlet'/>" method="post" onsubmit="return checkForm()"> 25 <input type="hidden" name="cid" value="${parent.cid }"/> 26 <input type="hidden" name="method" value="editParent"/> 27 分类名称：<input type="text" name="cname" id="cname" value="${parent.cname }"/><br/> 28 分类描述：<textarea rows="5" cols="50" id="desc" name="desc">${parent.desc }</textarea><br/> 29 <input type="submit" value="修改分类"/> 30 <input type="button" value="返回" onclick="history.go(-1)"/> 31 </form> 32 </body> 33 </html>
2.servlet层
(1）AdminCategoryServlet.java
1 /** 2 * 准备编辑一级分类 3 * @param req 4 * @param resp 5 * @return 6 * @throws ServletException 7 * @throws IOException 8 */ 9 public String editParentPre(HttpServletRequest req, HttpServletResponse resp) 10 throws ServletException, IOException { 11 req.setAttribute("parent", service.load(req.getParameter("cid"))); 12 return "/adminjsps/admin/category/edit.jsp"; 13 } 14 15 /** 16 * 编辑一级分类 17 * @param req 18 * @param resp 19 * @return 20 * @throws ServletException 21 * @throws IOException 22 */ 23 public String editParent(HttpServletRequest req, HttpServletResponse resp) 24 throws ServletException, IOException { 25 Category parent = CommonUtils.toBean(req.getParameterMap(), Category.class); 26 service.edit(parent); 27 return findAll(req, resp); 28 }
3.service层
(1）AdminCategoryService.java
1 /** 2 * 加载分类 3 * @param cid 4 * @return 5 */ 6 public Category load(String cid) { 7 try { 8 return categoryDao.load(cid); 9 } catch (SQLException e) { 10 throw new RuntimeException(e); 11 } 12 } 13 14 /** 15 * 修改分类 16 * @param category 17 */ 18 public void edit(Category category) { 19 try { 20 categoryDao.edit(category); 21 } catch (SQLException e) { 22 throw new RuntimeException(e); 23 } 24 }
4.dao层
(1）AdminCategoryDao.java
1 /** 2 * 加载分类 3 * @param cid 4 * @return 5 * @throws SQLException 6 */ 7 public Category load(String cid) throws SQLException { 8 String sql = "select * from t_category where cid=?"; 9 Map<String,Object> map = qr.query(sql, new MapHandler(), cid); 10 return toCategory(map); 11 } 12 13 /** 14 * 修改分类 15 * @param category 16 * @throws SQLException 17 */ 18 public void edit(Category category) throws SQLException { 19 String sql = "update t_category set cname=?, pid=?, `desc`=? where cid=?"; 20 String pid = null; 21 if(category.getParent() != null) { 22 pid = category.getParent().getCid(); 23 } 24 Object [] params = {category.getCname(), pid, category.getDesc(), category.getCid()}; 25 qr.update(sql, params); 26 }