JSP第八次作业
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 package com.gd.entity; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.PreparedStatement; 6 import java.sql.ResultSet; 7 import java.sql.SQLException; 8 9 public class BaseDao { 10 public Connection getConnection() { 11 Connection con = null; 12 try { 13 Class.forName("com.mysql.jdbc.Driver"); 14 con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","123456"); 15 } catch (Exception e) { 16 e.printStackTrace(); 17 } 18 return con; 19 } 20 21 protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){ 22 try { 23 if(rs != null) 24 rs.close(); 25 if(ps != null) 26 ps.close(); 27 if(con != null) 28 con.close(); 29 } catch (SQLException e) { 30 e.printStackTrace(); 31 } 32 } 33 34 }
1 package com.gd.entity; 2 3 import java.sql.Connection; 4 import java.sql.PreparedStatement; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 8 public class StuDao extends BaseDao{ 9 public int Register(String uname, String password, int age) { 10 int i = -1; 11 Connection con = getConnection(); 12 String sql = "insert into stu(uname,password,age)values(?,?,?)"; 13 PreparedStatement pred = null; 14 try { 15 pred = con.prepareStatement(sql); 16 pred.setString(1, uname); 17 pred.setString(2, password); 18 pred.setInt(3, age); 19 i = pred.executeUpdate(); 20 } catch (SQLException e) { 21 e.printStackTrace(); 22 } finally { 23 closeAll(con, pred, null); 24 } 25 return i; 26 } 27 public boolean Login(String uname, String password) { 28 boolean f=false; 29 Connection con = getConnection(); 30 String sql = "select * from stu where uname=? and password=?"; 31 PreparedStatement pred = null; 32 ResultSet resultSet = null; 33 try { 34 pred = con.prepareStatement(sql); 35 pred.setString(1, uname); 36 pred.setString(2, password); 37 resultSet = pred.executeQuery(); 38 while (resultSet.next()) { 39 f=true; 40 } 41 } catch (SQLException e) { 42 e.printStackTrace(); 43 } finally { 44 closeAll(con, pred, resultSet); 45 } 46 return f; 47 } 48 49 }
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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 7 <html> 8 <head> 9 <title>My JSP 'register.jsp' starting page</title> 10 </head> 11 <body> 12 <h1>注册</h1> 13 <form action="doregister.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>年龄</td> 26 <td><input type="number" name="age"></td> 27 </tr> 28 <tr> 29 <td><input type="submit" value="注册"></td> 30 <td><input type="reset" value="重置"></td> 31 </tr> 32 </table> 33 </form> 34 </body> 35 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@page import="com.gd.entity.StuDao"%> 3 <%@page import="javax.xml.bind.ParseConversionEvent"%> 4 <% 5 request.setCharacterEncoding("utf-8"); 6 response.setCharacterEncoding("utf-8"); 7 %> 8 9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 10 <html> 11 <head> 12 13 14 <title>My JSP 'doregister.jsp' starting page</title> 15 16 17 </head> 18 19 <body> 20 <% 21 String uname = request.getParameter("uname"); 22 String password = request.getParameter("password"); 23 String age = request.getParameter("age"); 24 int age1 = age == null ? -1 : Integer.parseInt(age); 25 StuDao sd=new StuDao(); 26 int i=sd.Register(uname, password, age1); 27 if(i>0){ 28 request.getRequestDispatcher("login.jsp").forward(request, response); 29 }else{ 30 out.print("注册失败"); 31 } 32 %> 33 </body> 34 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 3 <html> 4 <head> 5 <title>My JSP 'login.jsp' starting page</title> 6 </head> 7 8 <body> 9 <h1>欢迎</h1> 10 <form action="dologin.jsp" method="post"> 11 <table> 12 <tr> 13 <td>用户名</td> 14 <td><input type="text" name="uname"></td> 15 </tr> 16 17 <tr> 18 <td>密码</td> 19 <td><input type="password" name="password"></td> 20 </tr> 21 <tr> 22 <td><input type="submit" value="登录"></td> 23 <td><a href="register.jsp">注册</a></td> 24 </tr> 25 </table> 26 </form> 27 </body> 28 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@page import="com.gd.entity.StuDao"%> 3 <%@page import="javax.xml.bind.ParseConversionEvent"%> 4 <% 5 request.setCharacterEncoding("utf-8"); 6 response.setCharacterEncoding("utf-8"); 7 %> 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <title>My JSP 'dologin.jsp' starting page</title> 12 </head> 13 14 <body> 15 <% 16 String uname = request.getParameter("uname"); 17 String password = request.getParameter("password"); 18 StuDao sd=new StuDao(); 19 if(sd.Login(uname, password)){ 20 request.getRequestDispatcher("index.jsp").forward(request, response); 21 }else{ 22 out.print("登陆失败，即将跳回登陆页....."); 23 response.setHeader("refresh", "2;url=login.jsp"); 24 } 25 26 %> 27 </body> 28 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 3 4 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 5 <html> 6 <head> 7 8 9 <title>My JSP 'index.jsp' starting page</title> 10 11 </head> 12 13 <body> 14 <h1>登录成功</h1> 15 </body> 16 </html>
