Struts1.x 用户登录模块的实现

页面验证部分：

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset==UTF-8">
 7 <title>Insert title here</title>
 8 <script type="text/javascript" src="resources/js/lib/jquery.min.js"></script>
 9 <script type="text/javascript">
10 $(function(){
11     $("[type='button']").click(function(){
12         if($.trim($("[name='userName']").val()) == ""){
13             $("[name='userName']").select();
14             $("[name='userName']").focus();
15             $("#msg").html("请输入用户名！");
16             return;
17         }
18         if($.trim($("[name='pwd']").val()) == ""){
19             $("[name='pwd']").select();
20             $("[name='pwd']").focus();
21             $("#msg").html("请输密码！");
22             return;
23         }
24         $.post("user.do?op=checkLogin",{userName:$("[name='userName']").val(),pwd:$("[name='pwd']").val()},function(data){
25             if(data == "1"){
26                 location.href = "main.jsp";
27             }
28             else{
29                 $("#msg").html("用户名密码错误，请重新输入！");
30             }
31         });
32     });
33 });
34 </script>
35 </head>
36 <body>
37 用户注册<br/>
38 
39 <form method="post" action="addUser.do">
40     <table>
41         <tr>
42             <td>用户名：</td>
43             <td><input type="text" name="userName"/></td>
44         </tr>
45         <tr>
46             <td>密码：</td>
47             <td><input type="password" name="pwd"/></td>
48         </tr>
49         <tr>
50             <td colspan="2">
51                 <input type="button" value="提 交"/>
52             </td>
53         </tr>
54     </table>
55 </form>
56 <div id="msg"></div>
57 <br/>
58 <br/>
59 <a href="main.jsp">返回主页面</a>
60 </body>
61 </html>
View Code

上面的代码说明一个地方：在ajax的post方法中，回调函数 return false 表单是还会提交的，所以没办法，只能将提交按钮改为type="button"，暂时没想到其他办法。

DAO

 1 /**
 2      * 登录检查
 3      * @param user
 4      * @return
 5      */
 6     public boolean checkLogin(User user){
 7         boolean flag = false;
 8         String sql = "select * from users where userName = ? and pwd=?";
 9         Connection conn = DBLib.getConn();
10         PreparedStatement pstmt;
11         try {
12             pstmt = conn.prepareStatement(sql);
13             pstmt.setString(1, user.getUserName());
14             pstmt.setString(2, user.getPwd());
15             ResultSet set = pstmt.executeQuery();
16             if(set.next()){
17                 flag = true;
18             }
19             set.close();
20             pstmt.close();
21         } catch (SQLException e) {
22             e.printStackTrace();
23         } finally{
24             try {
25                 conn.close();
26             } catch (SQLException e) {
27                 e.printStackTrace();
28             }
29         }
30         return flag;
31     }
View Code

Action 方法

 1     /**
 2      * 登录认证
 3      * @param mapping
 4      * @param form
 5      * @param request
 6      * @param response
 7      * @return
 8      * @throws Exception
 9      */
10     public ActionForward checkLogin(ActionMapping mapping, ActionForm form, HttpServletRequest request,
11             HttpServletResponse response) throws Exception {
12         User user = (User)form;
13         UserDAO dao = new UserDAO();
14         String rel = dao.checkLogin(user) ? "1" : "0";
15         response.getWriter().write(rel);
16         return null;
17     }
View Code

struts-config.xml就不用配置了。

OK.

代码链接：http://pan.baidu.com/s/1qYe1rWw 提取码：8zt3

posted @ 2017-03-19 04:02  流年如水烟雨随风  阅读(255)  评论(0)  编辑  收藏  举报