1月20日
61643 ワード
きょう習った
作成
タイトルセクション
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<header>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="container-fluid">
<a class="navbar-brand" href="#">TODO APP</a>
<button class="navbar-toggler" type="button"
data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav ms-auto mb-2 mb-lg-0">
<li class="nav-item"><a class="nav-link" href="<%=request.getContextPath()%>/login/login.jsp">로그인</a></li>
<li class="nav-item"><a class="nav-link" href="<%=request.getContextPath()%>/register/register.jsp">가입하기</a></li>
</ul>
</div>
</div>
</nav>
</header>
フッターセクション
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<footer class="footer font-small black">
<div class="footer-copyright text-center py-3">
© 2022 Copyright : <strong> Korea IT</strong>
</div>
</footer>
購読する
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/bootstrap.min.css" />
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/style.css" />
<title>유저 등록</title>
</head>
<body>
<jsp:include page="../common/header.jsp" />
<!-- navbar 끝 -->
<!-- 본문 -->
<div class="container">
<h2>유저 등록</h2>
<div class="col-md-6">
<div class="alert alert-success center" role="alert">
<p><%=session.getAttribute("message")%></p>
</div>
<form action="<%=request.getContextPath()%>/register" method="post">
<div class="form-group">
<label for="firstName">성 :</label> <input type="text"
class="form-control" name="firstName" required />
</div>
<div class="form-group">
<label for="lastName">이름 :</label> <input type="text"
class="form-control" name="lastName" required />
</div>
<div class="form-group">
<label for="userName">Id :</label> <input type="text"
class="form-control" name="userName" required />
</div>
<div class="form-group">
<label for="password">password :</label> <input type="text"
class="form-control" name="password" required />
</div>
<div class="form-group mt-3">
<button type="submit" class="btn btn-outline-success">
가입하기</button>
</div>
</form>
</div>
</div>
<!-- 본문 끝 -->
<jsp:include page="../common/footer.jsp" />
<script src="<%=request.getContextPath()%>/js/bootstrap.bundle.min.js"></script>
</body>
</html>
ログインセクション
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/bootstrap.min.css" />
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/style.css" />
<title>로그인</title>
</head>
<body>
<jsp:include page="../common/header.jsp" />
<!-- navbar 끝 -->
<!-- 본문 -->
<div class="container">
<h2>로그인</h2>
<div class="col-md-6">
<div class="alert alert-success center" role="alert">
<p><%=session.getAttribute("message")%></p>
</div>
<form action="<%=request.getContextPath()%>/login" method="post">
<div class="form-group">
<label for="username">Id :</label> <input type="text"
class="form-control" name="username" value="<%=session.getAttribute("user") %>" required />
</div>
<div class="form-group">
<label for="password">password :</label> <input type="text"
class="form-control" name="password" required />
</div>
<div class="form-group mt-3">
<button type="submit" class="btn btn-outline-secondary">
로그인</button>
</div>
</form>
</div>
</div>
<!-- 본문 끝 -->
<jsp:include page="../common/footer.jsp" />
<script src="<%=request.getContextPath()%>/js/bootstrap.bundle.min.js"></script>
</body>
</html>
users,todos DBテーブルの作成
login Controller
package todoApp.controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import todoApp.dao.LoginDao;
import todoApp.model.LoginBean;
@WebServlet("/login")
public class LoginController extends HttpServlet {
private static final long serialVersionUID = 1L;
private LoginDao loginDao;
@Override
public void init() {
loginDao = new LoginDao();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
session.setAttribute("user", ""); // 공백입력, 로그인 실패를 해도 계속 보여줄 것이기 떄문에
session.setAttribute("message", ""); // null값이 출력되지 않도록 공백입력
// login 페이지로 이동
response.sendRedirect("login/login.jsp"); // login 폴더 안의 login.jsp페이지로 이동
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8"); // 입력 받을 떄 한글
response.setContentType("text/html;charset=UTF-8"); // 출력할 떄 한글
// ID, PASSWORD를 parameter로 입력받기
String username = request.getParameter("username");
String password = request.getParameter("password");
LoginBean loginBean = new LoginBean();
loginBean.setUsername(username);
loginBean.setPassword(password);
if (loginDao.validate(loginBean)) { // 계정이 있음 => todolist.jsp로 forward
RequestDispatcher dispatcher = request.getRequestDispatcher("todo/todolist.jsp");
dispatcher.forward(request, response);
} else { // 로그인 실패 시
HttpSession session = request.getSession();
session.setAttribute("user", username); // ID는 다시 보내줌
session.setAttribute("message", "잘못입력하셨습니다.");
response.sendRedirect("login/login.jsp"); // 모든 입력데이터가 사라짐(페이지 새로열기)
}
}
}SQL文を使用したデータベース・データの問合せ
package todoApp.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import todoApp.model.LoginBean;
import todoApp.utils.JDBCUtils;
// DB연결하여 login 확인하는 메소드 만들 Class
public class LoginDao {
// 계정이 있으면 true, 없으면 false
public boolean validate(LoginBean loginbean) {
boolean status = false;
String sql = "SELECT * from users where userName = ? and password = ?";
try {
Connection conn = JDBCUtils.getConnection();
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, loginbean.getUsername());
pstmt.setString(2, loginbean.getPassword());
ResultSet rs = pstmt.executeQuery();
status = rs.next(); // 한 줄이라도 있으면 true, 없으면 false
} catch (SQLException e) {
System.out.println("SQL login ERROR!");
}
return status;
}
}
Reference
この問題について(1月20日), 我々は、より多くの情報をここで見つけました https://velog.io/@tutu10000/1월-20일テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol