JSP connecting Oracle to realize login and registration

requirement
tomcat、oracle The database service starts
Need one Oracle The driver of , Put it in WEB-INFO Of lib. Version number: ：
Eclipse Create directory

Database files
stay Oracle In the database scott The connection of , Create a name called t_user Table of , The fields of the table are username,password.

UserDao.java

UserDao Interface , Define the lookup user （findUser） Methods and registered users （addUser） Method .

package jsp2.dao;
import jsp2.po.User;
public interface UserDao {
    
	/** *  Find user  * */
	public User findUser(User user);	
	/** *  Registered users  * */
	public void addUser(User user);
}

BaseDao.java

abstract class , Realization Database connection , close .

package jsp2.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public abstract class BaseDao {
    
	private final static String url="jdbc:oracle:thin:@localhost:1521:orcl";
	private final static String name="scott";
	private final static String pass="tiger";
	
	public Connection conn = null;
	public PreparedStatement pstm = null;
	public ResultSet rs = null;
	/** *  Database connection  * */
	public Connection getConn() {
    
		try {
    
			// Load database driver 
			Class.forName("oracle.jdbc.driver.OracleDriver");
			// Create database connection object 
			conn = DriverManager.getConnection(url, name, pass);
		}catch(ClassNotFoundException e){
    
			e.printStackTrace();
		} catch (SQLException e) {
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return conn;
	}
	/** *  Close method  * */
	public void close() {
    
		try {
    
			if(rs!=null) {
    
				rs.close();
				rs=null;
			}
			if(pstm!=null) {
    
				pstm.close();
				pstm=null;
			}
			if(conn!=null) {
    
				conn.close();
				conn=null;
			}
		} catch (SQLException e) {
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

UserDaoImpl.java

UserDao Implementation class

package jsp2.dao.impl;

import java.sql.SQLException;

import jsp2.dao.BaseDao;
import jsp2.dao.UserDao;
import jsp2.po.User;

public class UserDaoImpl extends BaseDao implements UserDao {
    

	@Override
	public User findUser(User user) {
    
		// TODO Auto-generated method stub
		User u = null;
		try {
    
			String sql="select username,password from t_user where username=? "
					+ "and password=?";
			conn = getConn();
			pstm =conn.prepareStatement(sql);
			pstm.setString(1, user.getUsername());
			pstm.setString(2, user.getPassword());
			rs= pstm.executeQuery();
			while (rs.next()) {
    
				u = new User(rs.getString("username"),rs.getString("password"));
			}
		} catch (SQLException e) {
    
			// TODO: handle exception
		}finally {
    
			close();// Call the close method 
		}
		return u;
	}
	
	@Override
	public void addUser(User user) {
    
		// TODO Auto-generated method stub
		try {
    
			String sql="insert into t_user(username,password) values(?,?)";
			conn = getConn();
			pstm =conn.prepareStatement(sql);
			pstm.setString(1, user.getUsername());
			pstm.setString(2, user.getPassword());
			pstm.executeQuery();
		} catch (SQLException e) {
    
			// TODO: handle exception
		}finally {
    
			close();
		}
	}

}

User.java

Encapsulates a user object .

package jsp2.po;

public class User {
    
	private String username;
	private String password;
	public User(String username, String password) {
    
		this.username = username;
		this.password = password;
	}
	public String getUsername() {
    
		return username;
	}
	public void setUsername(String username) {
    
		this.username = username;
	}
	public String getPassword() {
    
		return password;
	}
	public void setPassword(String password) {
    
		this.password = password;
	}
	
}

UserService.java

UserService Interface , Inherit UserDao The method in , Define whether the user repeats the method .

package jsp2.service;
import jsp2.dao.UserDao;
import jsp2.po.User;
public interface UserService extends UserDao {
    
	/** * Whether the user repeats  */
	public boolean isReg(User user);
}

UserServiceImpl.java

package jsp2.service.impl;

import jsp2.dao.UserDao;
import jsp2.dao.impl.UserDaoImpl;
import jsp2.po.User;
import jsp2.service.UserService;

public class UserServiceImpl implements UserService {
    
	public UserDao uDao = new UserDaoImpl();
	@Override
	public User findUser(User user) {
    
		// TODO Auto-generated method stub
		return uDao.findUser(user);
	}

	@Override
	public void addUser(User user) {
    
		// TODO Auto-generated method stub
		uDao.addUser(user);
	}

	@Override
	public boolean isReg(User user) {
    
		// TODO Auto-generated method stub
		User u =uDao.findUser(user);
		if(u==null) {
    
			return true;
		}
		return false;
	}
	
	
}

login.jsp

The login page , Used to log in users , Log in successfully and jump to success page , Failure to return login page .

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> Sign in </title>
<style>
input[type="submit"] {
    
	width: 100px;
	margin: 0 5px;
}
input[type="button"] {
    
	width: 100px;
	margin: 0 5px;
}
</style>
</head>
<body>
	<center>
	<font face=" Regular script " size="6" color="#000"> Login screen </font>
	<form action="index.jsp" method="post">
	<table width="300" height="180" border="5" bordercolor="#A0A0A0">
		<tbody>
			<tr>
				<td><label> user name ：</label></td>
				<td><input type="text" name="name" maxlength = "12" placeholder=" Please enter a user name !" /></td>
			</tr>
			<tr>
				<td><label> The secret &nbsp;&nbsp;&nbsp;  code ：</label></td>
				<td><input type="password" name="pwd" maxlength = "16" placeholder=" Please input a password !" /></td>
			</tr>
			<tr>
				<td colspan="2" align="center">
				<input type="submit" value=" land " />
				<input type="button" value=" register " onclick = "window.open('reg.jsp')" /></td>
			</tr>
		</tbody>
	</table>
	</form>
	</center>
</body>
</html>

index.jsp

Login detection , call UserService Medium java Code （ Method ）, Implement user login

<%@page import="jsp2.service.impl.UserServiceImpl"%>
<%@page import="jsp2.service.UserService"%>
<%@page import="jsp2.po.User" %>
<%@ page import="java.sql.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>login</title>
</head>
<body>
	<%
		request.setCharacterEncoding("UTF-8");
		String uName = request.getParameter("name");// obtain name value 
		String uPwd = request.getParameter("pwd");// obtain pwd value 
		UserService userService = new UserServiceImpl();
		User user=userService.findUser(new User(uName,uPwd));// call findUser Method , The user login 
		if(user!=null){
    // Login successful 
			session.setAttribute("info", user);
			// Set up session value , Put the data you want in session From here on out 
			response.sendRedirect("success.jsp");
		}else{
    // Login failed 
			response.sendRedirect("login.jsp");
		}
	%>
</body>
</html>

reg.jsp

Registration page , For registering users , After successful registration, jump to login page , Failure to return reg page .

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> The registration screen </title>
<style>
input[type="submit"] {
    
	width: 100px;
	margin: 0 5px;
}
input[type="reset"] {
    
	width: 100px;
	margin: 0 5px;
}
</style>
<script>
	function addCheck() {
    
		var username = document.getElementById("username").value;
		var password = document.getElementById("password").value;
		var newword = document.getElementById("newword").value;
		if (username == "") {
    
			alert(" The username cannot be empty !");
			document.getElementById("username").focus();
			return false;
		}
		if (password == "") {
    
			alert(" The password cannot be empty !");
			document.getElementById("password").focus();
			return false;
		}
		if (password != newword) {
    
			alert(" The two passwords are different !");
			document.getElementById("newword").focus();
			return false;
		}
	}
	function validate() {
    
		var flag = addCheck();
		if (flag == false)
			return false;
		return true;
	}
</script>
</head>
<body>
	<center>
		<font face=" Regular script " size="6" color="#000"> The registration screen </font>
		<form action="index2.jsp" method="post"
			onsubmit="return validate()">
			<table width="300" height="180" border="5" bordercolor="#A0A0A0">
				<tr>
					<th> user name ：</th>
					<td><input type="text" name="name" id="username"
						placeholder=" Input 4 Within characters " maxlength="4"></td>
				</tr>
				<tr>
					<th> Input password ：</th>
					<td><input type="password" name="pwd" id="password"
						placeholder=" Input 12 Within characters " maxlength="12"></td>
				</tr>
				<tr>
					<th> Confirm the password ：</th>
					<td><input type="password" name="nwd" id="newword"
						placeholder=" Reenter the password " maxlength="12"></td>
				</tr>
				<tr>
					<td colspan="2" align="center">
					<input type="submit"value=" notes   book "> 
					<input type="reset" value=" heavy   Set up "></td>
				</tr>
			</table>
		</form>
	</center>
</body>
</html>

index2.jsp

Register to detect , call UserService Medium java Code （ Method ）, Implement user registration

<%@page import="jsp2.service.impl.UserServiceImpl"%>
<%@page import="jsp2.service.UserService"%>
<%@page import="jsp2.po.User" %>
<%@ page import="java.sql.*" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>login</title>
</head>
<body>
	<%
		request.setCharacterEncoding("UTF-8");
		String uName = request.getParameter("name");// Get output name value 
		String uPwd = request.getParameter("pwd");// Get output pwd value 
		UserService userService = new UserServiceImpl();
		boolean fg = userService.isReg(new User(uName,uPwd));// call isReg Method 
		if(fg){
    // Registered successfully 
			userService.addUser(new User(uName,uPwd));// Registered users 
			response.sendRedirect("login.jsp");
		}else{
    // Registration failed 
			response.sendRedirect("reg.jsp");
		}
	%>
</body>
</html>

success.jsp

After logging in successfully, jump to the page

<%@page import="jsp2.po.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> Login successful </title>
</head>
<body>
	<center>
	<h3>
    <% 
    if(session.getAttribute("info")==null){
    
    	response.sendRedirect("login.jsp");
    }else{
    
    	User user=(User) session.getAttribute("info");
    %>
	     Welcome ：<%=user.getUsername() %>
    <%
    }
    %>
     <br/>
    <a href="out.jsp"> Cancellation </a>
    </h3>
    </center>
</body>
</html>

out.jsp

Log off the currently logged in user , Exit the login success page , You need to log in again to enter the page

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> Cancellation </title>
</head>
<body>
	<% 
		session.removeAttribute("info"); // To empty the current session Specify the properties of the object in 
		response.sendRedirect("login.jsp");// Redirect ( Page Jump )
	%>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>jsp2</display-name>
  <welcome-file-list>  
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
 <!--  That is to say, the longest interval between the client and the server is 2 minute , 2 Minutes later session.getAttribute() The value obtained is null -->
  <session-config>
  	<session-timeout>2</session-timeout>
  </session-config>
</web-app>