JSP第八次作业（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
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'register.jsp' starting page</title> </head> <body> <form action="doregister.jsp" method="post"> 用户名:<input type="text" name="uname"><br> 密 码: <input type="password" name="password"> <br> 年 龄:<input type="text" name="age"><br> <input type="submit" value="注册"><hr> </form><hr> <a href="login.jsp">返回登录</a> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'login.jsp' starting page</title> </head> <body> <script type="text/javascript"> function validate() { if (loginForm.uname.value == "") { alert("账号不能为空!"); return; } if (loginForm.password.value == "") { alert("密码不能为空!"); return; } loginForm.submit(); } </script> <form name="loginForm" action="dologin.jsp" method="post"> 用户名:<input type="text" name="uname"><br> 密 码: <input type="password" name="password"> <br> <input type="button" value="登录" onclick="validate()"><hr> </form> <hr> <a href="register.jsp">返回注册</a> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page import="homework.User" %> <%@ page import="homework.Stu" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'dologin.jsp' starting page</title> </head> <body > <% request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); String uname = request.getParameter("uname"); String password = request.getParameter("password"); Stu stu = new Stu(); User user = stu.getUserByName(uname); if (password.equals(user.getPassword())) { response.sendRedirect("ok.jsp"); } else { response.sendRedirect("no.jsp"); } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page import="homework.User" %> <%@ page import="homework.Stu" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'doregister.jsp' starting page</title> </head> <body> <% request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); String uname=request.getParameter("uname"); String password=request.getParameter("password"); Integer age=Integer.parseInt(request.getParameter("age")); User user=new User(uname,password,age); Stu stuDao=new Stu(); stuDao.regUser(user); response.sendRedirect("login.jsp"); %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'ok.jsp' starting page</title> </head> <body> <h1>登录成功！！！</h1> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'no.jsp' starting page</title> </head> <body> <h1>登录失败！3秒后将返回登录界面</h1> <% response.setHeader("refresh", "3;url=login.jsp"); %> </body> </html>
package homework; public class User { private Integer stuId; private String uname; private String password; private Integer age; public User(String uname, String password, Integer age) { super(); this.uname = uname; this.password = password; this.age = age; } public User() { super(); } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Integer getStuId() { return stuId; } public void setStuId(Integer stuId) { this.stuId = stuId; } }
package homework; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class Dao { static { try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static Connection getCon() { Connection cn = null; try { cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return cn; } }
package homework; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class Stu { public void regUser(User user) { String sql = "insert into stu(uname,password,age) value(?,?,?)"; Connection cn = null; PreparedStatement ps = null; // 创建连接 cn = Dao.getCon(); try { // 预编译 ps = cn.prepareStatement(sql); // 替换占位符‘？’ ps.setString(1, user.getUname()); ps.setString(2, user.getPassword()); ps.setInt(3, user.getAge()); // 编译执行sql语句 ps.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { ps.close(); cn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public User getUserByName(String uname) { String sql = "select * from stu where uname=?"; Connection cn = null; PreparedStatement ps = null; ResultSet res = null; User user = null; cn = Dao.getCon(); try { ps = cn.prepareStatement(sql); ps.setString(1, uname); res = ps.executeQuery(); if (res.next()) { user = new User(res.getString("uname"), res.getString("password"), res.getInt("age")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { ps.close(); cn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return user; } }
