MySQL 8.4
package com.example.demo.controller;
import com.example.demo.domain.Country;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.*;
import java.util.ArrayList;
@WebServlet(name = "jDBCTestController", urlPatterns = {"/sba2/jdbc"})
public class JDBCTestController extends HttpServlet {
private Connection conn = null; //
private Statement stmt = null;
private PreparedStatement pstmt = null;
private ResultSet rs = null;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
process(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
process(request, response);
}
protected void process(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String jdbcUrl = "jdbc:mysql://localhost:3306/world?characterEncoding=UTF-8";
String dbUser = "root";
String dbPass = "cometrue";
try {
// 드라이버 로딩 - 연결하기 위해 필요
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
//여기 쫑나면 아래는 실행 안됨
try {
conn = DriverManager.getConnection(jdbcUrl, dbUser, dbPass);
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from country");
System.out.println("Connection Success - " + jdbcUrl);
/*아래 두 줄 추가*/
ArrayList<Country> countries = new ArrayList<Country>();
Country country = null;
while (rs.next()) {
country = new Country();
//re : 결과 집합 객체에서 필드명에 해당하는 문자열 값을 가져와 country객체에 배정
country.setCode(rs.getString("code"));
country.setName(rs.getString("name"));
country.setContinent(rs.getString("continent"));
country.setRegion(rs.getString("region"));
countries.add(country);
//배열에 객체(레코드)를 하나씩 집어넣는다
//country는 레코드 하나 값으로 설정된 객체
// System.out.print(rs.getString(1) + "\t");
// System.out.println(rs.getString(2));
}
request.setAttribute("countries", countries);
request.getRequestDispatcher("/WEB-INF/sba2/country.jsp").forward(request, response);//여기 경로도 바꿔야 함
//sba2의 country.jsp
} catch (SQLException e) {
System.out.println("Connection Fail - ");
e.printStackTrace();
} finally {
if (rs != null) try { rs.close(); } catch (Exception ignored) {}
if (pstmt != null) try { pstmt.close(); } catch (Exception ignored) {}
if (stmt != null) try { stmt.close(); } catch (Exception ignored) {}
if (conn != null) try { conn.close(); } catch (Exception ignored) {}
}
}
}
jcf :
arraylist :
//country.jsp
<%@ page import="java.util.ArrayList" %>
<%@ page import="com.example.demo.domain.Country" %>
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<title>SB Admin 2 - Tables</title>
<!-- Custom fonts for this template -->
<link href="../sba2/vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
<link
href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i"
rel="stylesheet">
<!-- Custom styles for this template -->
<link href="../sba2/css/sb-admin-2.min.css" rel="stylesheet">
<!-- Custom styles for this page -->
<link href="../sba2/vendor/datatables/dataTables.bootstrap4.min.css" rel="stylesheet">
</head>
<body id="page-top">
<!-- Page Wrapper -->
<div id="wrapper">
<!-- Sidebar -->
<%@include file="sidebar.jsp"%>
<!-- End of Sidebar -->
<!-- Content Wrapper -->
<div id="content-wrapper" class="d-flex flex-column">
<!-- Main Content -->
<div id="content">
<!-- Topbar -->
<nav class="navbar navbar-expand navbar-light bg-white topbar mb-4 static-top shadow">
<!-- Sidebar Toggle (Topbar) -->
<form class="form-inline">
<button id="sidebarToggleTop" class="btn btn-link d-md-none rounded-circle mr-3">
<i class="fa fa-bars"></i>
</button>
</form>
<!-- Topbar Search -->
<form
class="d-none d-sm-inline-block form-inline mr-auto ml-md-3 my-2 my-md-0 mw-100 navbar-search">
<div class="input-group">
<input type="text" class="form-control bg-light border-0 small" placeholder="Search for..."
aria-label="Search" aria-describedby="basic-addon2">
<div class="input-group-append">
<button class="btn btn-primary" type="button">
<i class="fas fa-search fa-sm"></i>
</button>
</div>
</div>
</form>
<!-- Topbar Navbar -->
<ul class="navbar-nav ml-auto">
<!-- Nav Item - Search Dropdown (Visible Only XS) -->
<li class="nav-item dropdown no-arrow d-sm-none">
<a class="nav-link dropdown-toggle" href="#" id="searchDropdown" role="button"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<i class="fas fa-search fa-fw"></i>
</a>
<!-- Dropdown - Messages -->
<div class="dropdown-menu dropdown-menu-right p-3 shadow animated--grow-in"
aria-labelledby="searchDropdown">
<form class="form-inline mr-auto w-100 navbar-search">
<div class="input-group">
<input type="text" class="form-control bg-light border-0 small"
placeholder="Search for..." aria-label="Search"
aria-describedby="basic-addon2">
<div class="input-group-append">
<button class="btn btn-primary" type="button">
<i class="fas fa-search fa-sm"></i>
</button>
</div>
</div>
</form>
</div>
</li>
<!-- Nav Item - Alerts -->
<li class="nav-item dropdown no-arrow mx-1">
<a class="nav-link dropdown-toggle" href="#" id="alertsDropdown" role="button"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<i class="fas fa-bell fa-fw"></i>
<!-- Counter - Alerts -->
<span class="badge badge-danger badge-counter">3+</span>
</a>
<!-- Dropdown - Alerts -->
<div class="dropdown-list dropdown-menu dropdown-menu-right shadow animated--grow-in"
aria-labelledby="alertsDropdown">
<h6 class="dropdown-header">
Alerts Center
</h6>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="mr-3">
<div class="icon-circle bg-primary">
<i class="fas fa-file-alt text-white"></i>
</div>
</div>
<div>
<div class="small text-gray-500">December 12, 2019</div>
<span class="font-weight-bold">A new monthly report is ready to download!</span>
</div>
</a>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="mr-3">
<div class="icon-circle bg-success">
<i class="fas fa-donate text-white"></i>
</div>
</div>
<div>
<div class="small text-gray-500">December 7, 2019</div>
$290.29 has been deposited into your account!
</div>
</a>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="mr-3">
<div class="icon-circle bg-warning">
<i class="fas fa-exclamation-triangle text-white"></i>
</div>
</div>
<div>
<div class="small text-gray-500">December 2, 2019</div>
Spending Alert: We've noticed unusually high spending for your account.
</div>
</a>
<a class="dropdown-item text-center small text-gray-500" href="#">Show All Alerts</a>
</div>
</li>
<!-- Nav Item - Messages -->
<li class="nav-item dropdown no-arrow mx-1">
<a class="nav-link dropdown-toggle" href="#" id="messagesDropdown" role="button"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<i class="fas fa-envelope fa-fw"></i>
<!-- Counter - Messages -->
<span class="badge badge-danger badge-counter">7</span>
</a>
<!-- Dropdown - Messages -->
<div class="dropdown-list dropdown-menu dropdown-menu-right shadow animated--grow-in"
aria-labelledby="messagesDropdown">
<h6 class="dropdown-header">
Message Center
</h6>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="dropdown-list-image mr-3">
<img class="rounded-circle" src="../sba2/img/undraw_profile_1.svg"
alt="...">
<div class="status-indicator bg-success"></div>
</div>
<div class="font-weight-bold">
<div class="text-truncate">Hi there! I am wondering if you can help me with a
problem I've been having.</div>
<div class="small text-gray-500">Emily Fowler · 58m</div>
</div>
</a>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="dropdown-list-image mr-3">
<img class="rounded-circle" src="../sba2/img/undraw_profile_2.svg"
alt="...">
<div class="status-indicator"></div>
</div>
<div>
<div class="text-truncate">I have the photos that you ordered last month, how
would you like them sent to you?</div>
<div class="small text-gray-500">Jae Chun · 1d</div>
</div>
</a>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="dropdown-list-image mr-3">
<img class="rounded-circle" src="../sba2/img/undraw_profile_3.svg"
alt="...">
<div class="status-indicator bg-warning"></div>
</div>
<div>
<div class="text-truncate">Last month's report looks great, I am very happy with
the progress so far, keep up the good work!</div>
<div class="small text-gray-500">Morgan Alvarez · 2d</div>
</div>
</a>
<a class="dropdown-item d-flex align-items-center" href="#">
<div class="dropdown-list-image mr-3">
<img class="rounded-circle" src="https://source.unsplash.com/Mv9hjnEUHR4/60x60"
alt="...">
<div class="status-indicator bg-success"></div>
</div>
<div>
<div class="text-truncate">Am I a good boy? The reason I ask is because someone
told me that people say this to all dogs, even if they aren't good...</div>
<div class="small text-gray-500">Chicken the Dog · 2w</div>
</div>
</a>
<a class="dropdown-item text-center small text-gray-500" href="#">Read More Messages</a>
</div>
</li>
<div class="topbar-divider d-none d-sm-block"></div>
<!-- Nav Item - User Information -->
<li class="nav-item dropdown no-arrow">
<a class="nav-link dropdown-toggle" href="#" id="userDropdown" role="button"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<span class="mr-2 d-none d-lg-inline text-gray-600 small">Douglas McGee</span>
<img class="img-profile rounded-circle"
src="../sba2/img/undraw_profile.svg">
</a>
<!-- Dropdown - User Information -->
<div class="dropdown-menu dropdown-menu-right shadow animated--grow-in"
aria-labelledby="userDropdown">
<a class="dropdown-item" href="#">
<i class="fas fa-user fa-sm fa-fw mr-2 text-gray-400"></i>
Profile
</a>
<a class="dropdown-item" href="#">
<i class="fas fa-cogs fa-sm fa-fw mr-2 text-gray-400"></i>
Settings
</a>
<a class="dropdown-item" href="#">
<i class="fas fa-list fa-sm fa-fw mr-2 text-gray-400"></i>
Activity Log
</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#" data-toggle="modal" data-target="#logoutModal">
<i class="fas fa-sign-out-alt fa-sm fa-fw mr-2 text-gray-400"></i>
Logout
</a>
</div>
</li>
</ul>
</nav>
<!-- End of Topbar -->
<!-- Begin Page Content -->
<div class="container-fluid">
<!-- Page Heading -->
<h1 class="h3 mb-2 text-gray-800">Tables</h1>
<p class="mb-4">DataTables is a third party plugin that is used to generate the demo table below.
For more information about DataTables, please visit the <a target="_blank"
href="https://datatables.net">official DataTables documentation</a>.</p>
<!-- DataTales Example -->
<div class="card shadow mb-4">
<div class="card-header py-3">
<h6 class="m-0 font-weight-bold text-primary">DataTables Example</h6>
</div>
<div class="card-body">
<div class="table-responsive">
<table class="table table-bordered" id="dataTable" width="100%" cellspacing="0">
<thead>
<tr>
<th>Code</th>
<th>Name</th>
<th>Continent</th>
<th>Region</th>
</tr>
</thead>
<tbody>
<%
ArrayList<Country> countries = ( ArrayList<Country>) request.getAttribute("countries");
for(Country country:countries){
out.println("<tr>");
out.println("<tr><td>" + country.getCode() + "</td>");
out.println("<tr><td>" + country.getName() + "</td>");
out.println("<tr><td>" + country.getContinent() + "</td>");
out.println("<tr><td>" + country.getRegion() + "</td>");
out.println("</tr>");
}
%>
</tbody>
</table>
</div>
</div>
</div>
</div>
<!-- /.container-fluid -->
</div>
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<!-- Footer -->
<footer class="sticky-footer bg-white">
<div class="container my-auto">
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</div>
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<a class="scroll-to-top rounded" href="#page-top">
<i class="fas fa-angle-up"></i>
</a>
<!-- Logout Modal-->
<div class="modal fade" id="logoutModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel"
aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Ready to Leave?</h5>
<button class="close" type="button" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
<div class="modal-footer">
<button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
<a class="btn btn-primary" href="login.jsp">Logout</a>
</div>
</div>
</div>
</div>
<!-- Bootstrap core JavaScript-->
<script src="../sba2/vendor/jquery/jquery.min.js"></script>
<script src="../sba2/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
<!-- Core plugin JavaScript-->
<script src="../sba2/vendor/jquery-easing/jquery.easing.min.js"></script>
<!-- Custom scripts for all pages-->
<script src="../sba2/js/sb-admin-2.min.js"></script>
<!-- Page level plugins -->
<script src="../sba2/vendor/datatables/jquery.dataTables.min.js"></script>
<script src="../sba2/vendor/datatables/dataTables.bootstrap4.min.js"></script>
<!-- Page level custom scripts -->
<script src="../sba2/js/demo/datatables-demo.js"></script>
</body>
</html>