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
package dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class BaseDao { protected Connection getConnection(){ Connection conn=null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/test", "root", "root"); } catch (Exception e) { e.printStackTrace(); } return conn; } protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){ try { if(rs != null) rs.close(); if(ps != null) ps.close(); if(con != null) con.close(); } catch (SQLException e) { e.printStackTrace(); } } }
package dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class StuDao extends BaseDao { public boolean login(String name, String pwd) { boolean f = false; Connection conn = getConnection(); String sql = "select * from stu where uname=? and upwd=?"; PreparedStatement ps = null; ResultSet rs = null; try { ps = conn.prepareStatement(sql); ps.setString(1, name); ps.setString(2, pwd); rs = ps.executeQuery(); if (rs.next()) f = true; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { closeAll(conn, ps, rs); } return f; } public int reg(String uname, String upwd, int uage) { Connection conn = getConnection(); PreparedStatement ps = null; int i = -1; try { String sql = "insert into stu(uname,upwd,uage) values(?,?,?)"; // 4.执行SQL语句 ps = conn.prepareStatement(sql); ps.setString(1, uname); ps.setString(2, upwd); ps.setInt(3, uage); i = ps.executeUpdate(); return i; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { closeAll(conn, ps, null); } return i; } }
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <form action="verification.jsp" method="post"> <b>用户名</b> <input type="text" name="uname" /> <br /> <b>密码</b> <input type="text" name="upwd" /> <br /> <input type="submit" value="登录" /> <a href="register.jsp">注册</a> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <form action="jump.jsp" method="post"> <b>用户名</b> <input type="text" name="uname" /> <br /> <b>密码</b> <input type="text" name="upwd" /> <br /> <b>年龄</b> <input type="text" name="uage"/> <br /> <input type="submit" value="注册" /> <a href="login.jsp">登录</a> </form> </body> </html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("uname"); String upwd = request.getParameter("upwd"); String uages = request.getParameter("uage"); String uname = new String(name.getBytes("ISO-8859-1"), "utf-8"); int uage = Integer.parseInt(uages); StuDao s1 = new StuDao(); if (s1.reg(uname, upwd, uages) != -1) { out.println("注册成功!"); out.println("三秒后跳转到主页..."); response.setHeader("refresh", "3;url=login.jsp"); } else { out.println("注册失败!"); out.println("三秒后跳转到主页..."); response.setHeader("refresh", "3;url=login.jsp"); } %> </body> </html>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ page import="dao.StuDao"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("uname"); String upwd = request.getParameter("upwd"); String uname = new String(name.getBytes("ISO-8859-1"), "utf-8"); try { int pwd = Integer.parseInt(upwd); StuDao s = new StuDao(); if (s.login(uname, upwd)) { out.println("登录成功!"); } else { out.println("登陆失败!"); out.println("三秒后跳转到主页面..."); response.setHeader("refresh", "3;url=login.jsp"); } } catch (Exception e) { out.println("异常!!"); out.println("三秒后跳转到主页面..."); response.setHeader("refresh", "3;url=login.jsp"); } %> <a href="login.jsp">返回</a> </body> </html>