用户表： uid (主键，自动增长) uname upwd
使用分层实现注册。（必做）
使用分层实现登录。（选做）
数据库中的信息
登录主页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<script type="text/javascript">
function changeActionToRegister(){
var s = document.getElementById("idForm")
s.setAttribute("action", "doRegister.jsp");
}
function changeActionToLogin(){
var s = document.getElementById("idForm")
s.setAttribute("action", "doLogin.jsp");
}
</script>
<body>
<form id="idForm" method="post">
用户名:<input type="text" name="username"/>
<br>
密码:<input type="password" name="password"/>
<br>
<input type="submit" onclick="changeActionToLogin()" value="登录">
<input type="submit" onclick="changeActionToRegister()" value="注册">
</form>
</body>
</html>
doLogin.jsp
<%@ page import="com.bean.lty.UserBean" %> <%@ page import="com.dao.lty.Dao" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <% UserBean userBean = new UserBean(); String username = request.getParameter("username"); String password = request.getParameter("password"); userBean.setUname(username); userBean.setUpassword(password); Dao dao = new Dao(); int i = dao.UserLogin(userBean); if(i > 0){ HttpSession session1 = request.getSession(); session1.setAttribute("username",username); session1.setAttribute("password",password); request.getRequestDispatcher("success.jsp").forward(request,response); }else{ response.sendRedirect("fail.jsp"); } %> </body> </html>
doRegister.jsp
<%@ page import="com.bean.lty.UserBean" %> <%@ page import="com.dao.lty.Dao" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <% UserBean userBean = new UserBean(); String username = request.getParameter("username"); String password = request.getParameter("password"); userBean.setUname(username); userBean.setUpassword(password); Dao dao = new Dao(); int i = dao.UesrRegister(userBean); if(i > 0){ HttpSession session1 = request.getSession(); session1.setAttribute("username",username); session1.setAttribute("password",password); request.getRequestDispatcher("ok.jsp").forward(request,response); }else{ response.sendRedirect("error.jsp"); } %> </body> </html>
实体类
package com.bean.lty; public class UserBean { private String uname; private String upassword; public UserBean() { } public UserBean(String uname, String upassword) { this.uname = uname; this.upassword = upassword; } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getUpassword() { return upassword; } public void setUpassword(String upassword) { this.upassword = upassword; } }
数据访问层
package com.dao.lty; import com.bean.lty.UserBean; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; public class Dao { UserBean userBean = new UserBean(); // 获取连接 protected static Connection getConnection() throws Exception { Class.forName("com.mysql.jdbc.Driver"); // 建立连接 Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/user_info?useUnicode=true&characterEncoding=utf8", "root", "root"); return conn; } // 关闭连接 public static void closeAll(Connection conn, PreparedStatement ps, ResultSet rs) throws Exception { if (rs != null) rs.close(); if (ps != null) ps.close(); if (conn != null) conn.close(); } public int UesrRegister(UserBean userBean) throws Exception { int i = 0; Connection conn = getConnection(); String sql = "insert into user(uname,upassword) values(?,?)"; PreparedStatement ps = conn.prepareStatement(sql); ps.setString(1, userBean.getUname()); ps.setString(2, userBean.getUpassword()); return i = ps.executeUpdate(); } public int UserLogin(UserBean userBean) throws Exception { int flag = 0; Connection conn = getConnection(); String sql = "select * from user where uname = ? and upassword = ?"; PreparedStatement ps = conn.prepareStatement(sql); ps.setString(1, userBean.getUname()); ps.setString(2, userBean.getUpassword()); ResultSet rs = ps.executeQuery(); while (rs.next() == true){ flag = 1; } return flag; } }
注册成功页面及失败页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
您已成功注册！注册信息:用户名：<%=request.getSession().getAttribute("username")%>
密码：<%=request.getSession().getAttribute("password")%>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
注册信息不正确，请重新进行注册！！！
</body>
</html>
登录成功页面及失败页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
登录成功！欢迎您,用户名：<%=request.getSession().getAttribute("username")%>
密码：<%=request.getSession().getAttribute("password")%>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
登录失败,用户名不存在！
</body>
</html>
