第十周
数据库test 中建个表 stu(stuid 主键 自动增长 ，用户名，密码，年龄)
1.设计一个注册页面，实现用户注册功能
2.设计一个登陆页面，实现用户名密码登陆
3.两个页面可以互相超链接
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
2 <%
3 request.setCharacterEncoding("utf-8");
4 response.setCharacterEncoding("utf-8");
5 %>
6
7 <!DOCTYPE HTML>
8 <html>
9 <head>
10 <title>注册</title>
11 </head>
12 <body>
13 <h1>注册</h1>
14 <form action="regin.jsp" method="post">
15 <table>
16 <tr>
17 <td>用户名</td>
18 <td><input type="text" name="uname"></td>
19 </tr>
20
21 <tr>
22 <td>密码</td>
23 <td><input type="password" name="password"></td>
24 </tr>
25 <tr>
26 <td>年龄</td>
27 <td><input type="number" name="age"></td>
28 </tr>
29 <tr>
30 <td><input type="submit" value="注册"></td>
31 <td><input type="reset" value="重置"></td>
32 </tr>
33 </table>
34 </form>
35 </body>
36 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
2 <%
3 request.setCharacterEncoding("utf-8");
4 response.setCharacterEncoding("utf-8");
5 %>
6 <!DOCTYPE HTML>
7 <html>
8 <head>
9 <title>登录</title>
10 </head>
11 <body>
12 <h1>欢迎</h1>
13 <form action="main.jsp" method="post">
14 <table>
15 <tr>
16 <td>用户名</td>
17 <td><input type="text" name="uname"></td>
18 </tr>
19
20 <tr>
21 <td>密码</td>
22 <td><input type="password" name="password"></td>
23 </tr>
24 <tr>
25 <td><input type="submit" value="登录"></td>
26 <td><a href="register.jsp">注册</a></td>
27 </tr>
28 </table>
29 </form>
30
31 </body>
32 </html>
1 <%@page import="snippet.StuDao"%>
2 <%@page import="javax.xml.bind.ParseConversionEvent"%>
3 <%@page language="java" import="java.util.*" pageEncoding="utf-8"%>
4 <%
5 request.setCharacterEncoding("utf-8");
6 response.setCharacterEncoding("utf-8");
7 %>
8
9 <!DOCTYPE HTML>
10 <html>
11 <head>
12 <title></title>
13 </head>
14 <body>
15 <%
16 String uname = request.getParameter("uname");
17 String password = request.getParameter("password");
18 String age = request.getParameter("age");
19 int age1 = age == null ? -1 : Integer.parseInt(age);
20 StuDao sd=new StuDao();
21 int i=sd.Register(uname, password, age1);
22 if(i>0){
23 request.getRequestDispatcher("login.jsp").forward(request, response);
24 }
25 %>
26 </body>
27 </html>
1 <%@page import="javax.xml.bind.ParseConversionEvent"%>
2 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
3 <%
4 request.setCharacterEncoding("utf-8");
5 response.setCharacterEncoding("utf-8");
6 %>
7
8 <!DOCTYPE HTML>
9 <html>
10 <head>
11 <title></title>
12 </head>
13 <body>
14 <%
15 String uname = request.getParameter("uname");
16 String password = request.getParameter("password");
17 snippet.StuDao sd=new snippet.StuDao();
18 if(sd.Login(uname, password)){
19 request.getRequestDispatcher("index.jsp").forward(request, response);
20 }else{
21 out.print("登陆失败，即将跳回登陆页.....");
22 response.setHeader("refresh", "5;url=login.jsp");
23 }
24 %>
25 </body>
26 </html>
1 <%@page import="snippet.StuDao"%>
2 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
3 <%
4 request.setCharacterEncoding("utf-8");
5 response.setCharacterEncoding("utf-8");%>
6
7 <!DOCTYPE HTML>
8 <html>
9 <head>
10 <title></title>
11 </head>
12 <body>
13 <h1>登录成功</h1>
14 </body>
15 </html>
1 package snippet;
2
3
4 import java.sql.Connection;
5 import java.sql.DriverManager;
6 import java.sql.PreparedStatement;
7 import java.sql.ResultSet;
8 import java.sql.SQLException;
9
10 public class BaseDao {
11 //连接数据库
12 public Connection getConnection() {
13 Connection con = null;
14 try {
15 Class.forName("com.mysql.jdbc.Driver");
16 con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","123456");
17 } catch (Exception e) {
18 e.printStackTrace();
19 }
20 return con;
21 }
22 //关闭数据库
23 protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){
24 try {
25 if(rs != null)
26 rs.close();
27 if(ps != null)
28 ps.close();
29 if(con != null)
30 con.close();
31 } catch (SQLException e) {
32 e.printStackTrace();
33 }
34 }
35
36 }
1 package snippet;
2
3
4 import java.sql.Connection;
5 import java.sql.PreparedStatement;
6 import java.sql.ResultSet;
7 import java.sql.SQLException;
8
9
10 public class StuDao extends BaseDao {
11 public int Register(String uname, String password, int age) {
12 int i = -1;
13 Connection con = getConnection();
14 String sql = "insert into stu(uname,password,age)values(?,?,?)";
15 PreparedStatement pred = null;
16 try {
17 pred = con.prepareStatement(sql);
18 pred.setString(1, uname);
19 pred.setString(2, password);
20 pred.setInt(3, age);
21 i = pred.executeUpdate();
22 } catch (SQLException e) {
23 e.printStackTrace();
24 } finally {
25 closeAll(con, pred, null);
26 }
27 return i;
28 }
29
30 public boolean Login(String uname, String password) {
31 boolean f = false;
32 Connection con = getConnection();
33 String sql = "select * from stu where uname=? and password=?";
34 PreparedStatement pred = null;
35 ResultSet resultSet = null;
36 try {
37 pred = con.prepareStatement(sql);
38 pred.setString(1, uname);
39 pred.setString(2, password);
40 resultSet = pred.executeQuery();
41 while (resultSet.next()) {
42 f = true;
43 }
44 } catch (SQLException e) {
45 e.printStackTrace();
46 } finally {
47 closeAll(con, pred, resultSet);
48 }
49 return f;
50 }
51 }
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