网上图书商城项目学习笔记-024后台模块介绍及管理员登录

一、流程分析

1.后台页面和模块

2.管理员

二、代码

1.view层

(1）loigin.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 3 
 4 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 5 <html>
 6   <head>
 7     <title>管理员登录页面</title>
 8     
 9     <meta http-equiv="pragma" content="no-cache">
10     <meta http-equiv="cache-control" content="no-cache">
11     <meta http-equiv="expires" content="0">    
12     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
13     <meta http-equiv="description" content="This is my page">
14     <!--
15     <link rel="stylesheet" type="text/css" href="styles.css">
16     -->
17     <script type="text/javascript" src="<c:url value='/jquery/jquery-1.5.1.js'/>"></script>
18     <script type="text/javascript">
19         function checkForm() {
20             if(!$("#adminname").val()) {
21                 alert("管理员名称不能为空！");
22                 return false;
23             }
24             if(!$("#adminpwd").val()) {
25                 alert("管理员密码不能为空！");
26                 return false;
27             }
28             return true;
29         }
30     </script>
31   </head>
32   
33   <body>
34 <h1>管理员登录页面</h1>
35 <hr/>
36   <p style="font-weight: 900; color: red">${msg }</p>
37 <form action="<c:url value='/AdminServlet'/>" method="post" onsubmit="return checkForm()">
38     <input type="hidden" name="method" value="login"/>
39     管理员账户：<input type="text" name="adminname" value="" id="adminname"/><br/>
40     密　　　码：<input type="password" name="adminpwd" id="adminpwd"/><br/>
41     <input type="submit" value="进入后台"/>
42 </form>
43   </body>
44 </html>

2.servlet层

(1）AdminServlet.java

 1 public class AdminServlet extends BaseServlet {
 2     private AdminService service = new AdminService();
 3     
 4     public String login(HttpServletRequest req, HttpServletResponse resp)
 5             throws ServletException, IOException {
 6         Admin formAdmin = CommonUtils.toBean(req.getParameterMap(), Admin.class);
 7         Admin admin = service.login(formAdmin);
 8         if(admin == null) {
 9             req.setAttribute("code", "error");
10             req.setAttribute("msg", "用户名或密码错误！");
11             return "f:/adminjsps/login.jsp";
12         }
13         req.getSession().setAttribute("admin", admin);
14         return "f:/adminjsps/admin/index.jsp";
15     }
16 }

3.service层

(1）AdminService.java

 1 public class AdminService {
 2     private AdminDao dao = new AdminDao();
 3     
 4     public Admin login(Admin admin) {
 5         try {
 6             return dao.findByNameAndPwd(admin.getAdminname(), admin.getAdminpwd());
 7         } catch (SQLException e) {
 8             throw new RuntimeException(e);
 9         }
10     }
11 
12 }

4.dao层

(1）AdminDao.java

 1 public class AdminDao {
 2 
 3     private QueryRunner qr = new TxQueryRunner();
 4     
 5     public Admin findByNameAndPwd(String adminname, String adminpwd) throws SQLException {
 6         String sql = "select * from t_admin where adminname=? and adminpwd=?";
 7         Admin admin = qr.query(sql, new BeanHandler<Admin>(Admin.class), adminname, adminpwd);
 8         return admin;
 9     }
10 }