1.安装MySQL数据库，建立用户表 uid uname upwd 并插入3条数据
2.制作jsp登录页面 login.jsp 提交到dologin.jsp，使用jdbc连数据库，判断输入的用户名密码是否存在
3.如果存在，把用户名保存在SESSION中，跳转到welcome.jsp，welcome.jsp中读取session中的用户名，显示欢迎你xxx
4.若不存在，跳到登录页面。
<%@page import="java.nio.channels.SeekableByteChannel"%> <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> <%@ page import="java.sql.*"%> <html> <head> <title>www.school.com</title> </head> <body> <%!public static final String DBDRIVER = "com.mysql.jdbc.Driver"; public static final String DBURL = "jdbc:mysql://localhost:3306/jspwork"; public static final String DBUSER = "root"; public static final String DBPASS = "root";%> <% Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; boolean flag = false; String name = null; %> <% try { Class.forName(DBDRIVER); conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS); String sql = "SELECT uname FROM num_one WHERE uid=? AND upwd=?"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, request.getParameter("id")); pstmt.setString(2, request.getParameter("password")); rs = pstmt.executeQuery(); if (rs.next()) { name = rs.getString(1); flag = true; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (rs != null) rs.close(); if (pstmt != null) pstmt.close(); if (conn != null) conn.close(); if (flag) { request.getSession().setAttribute("uname",name); request.getRequestDispatcher("ok.jsp").forward(request,response); // request.getRequestDispatcher("ok.jsp").forward(request, response); } else { response.sendRedirect("no.jsp"); } } catch (Exception e) { e.printStackTrace(); } } %> </body> </html>
<%@ page language="java" contentType="text/html" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <% String str = request.getParameter("address"); String pwd = request.getParameter("password"); if (null != str) { if (str.equals("ysp") && pwd.equals("123")) { pageContext.forward("MyJsp1.jsp"); } else { out.println("登录失败,请重新登录！"); } } %> <html> <head> <form action="" method="post"> <br> 账号： <input type="text" name="address" size="20"><br> 密码： <input type="password" name="password" size="21"><br> 验证码： <input type="text" name="2907" size="17"> <img id="yzmtp" src="aaa/23.jpg" width="120px" height="70px" />换一张<br> <input type="submit" value="登录" name="a"> </form> </head> <body style="background:url(aaa/1.jpg)";> </body> </html> <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <html> <head> </head> <body style="background:url(aaa/1.jpg)"> 欢迎ysp登录 <br> </body> </html>
