javaBeanSample

model.dao.ConnectionManager.java


package model.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectionManager {
	private final static String URL = "jdbc:postgresql://localhost:5432/mydb";
	private final static String USER = "postgres";
	private final static String PASSWORD = "xxxxxxxx";
//	private final static String URL = "jdbc:mysql://localhost:3306/sampledb";
//	private final static String USER = "userU";
//	private final static String PASSWORD = "userP";

	public static Connection getConnection() throws SQLException, ClassNotFoundException {
		// JDBCドライバの読み込み
		Class.forName("org.postgresql.Driver");
//		Class.forName("com.mysql.cj.jdbc.Driver");
		return DriverManager.getConnection(URL, USER, PASSWORD);
	}
}

model.dao.EmployeeDAO.java


package model.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import model.entity.EmployeeBean;

public class EmployeeDAO {
	public List＜EmployeeBean> selectAll()
			throws SQLException, ClassNotFoundException {

		List＜EmployeeBean> employeeList = new ArrayList＜EmployeeBean>();

		// データベースへの接続の取得、Statementの取得、SQLステートメントの実行
		try (Connection con = ConnectionManager.getConnection();
				Statement stmt = con.createStatement();
				ResultSet res = stmt.executeQuery("SELECT * FROM m_employee")) {

			// 結果の操作
			while (res.next()) {
				String code = res.getString("code");
				String name = res.getString("name");
				int age = res.getInt("age");
				String section = res.getString("section");

				EmployeeBean employee = new EmployeeBean();
				employee.setCode(code);
				employee.setName(name);
				employee.setAge(age);
				employee.setSection(section);

				employeeList.add(employee);
			}
		}
		return employeeList;
	}

	public EmployeeBean select(String code)
			throws SQLException, ClassNotFoundException {

		EmployeeBean employee = new EmployeeBean();

		String sql = "SELECT * FROM m_employee WHERE code = ?";
		// データベースへの接続の取得、PreparedStatementの取得
		try (Connection con = ConnectionManager.getConnection();
				PreparedStatement pstmt = con.prepareStatement(sql);) {

			// プレースホルダへの値の設定
			pstmt.setString(1, code);

			// SQLステートメントの実行
			ResultSet res = pstmt.executeQuery();

			// 結果の操作
			while (res.next()) {
				employee.setCode(res.getString("code"));
				employee.setName(res.getString("name"));
				employee.setAge(res.getInt("age"));
				employee.setSection(res.getString("section"));
			}
		}
		return employee;
	}

	public int update(EmployeeBean employee) throws SQLException, ClassNotFoundException {
		int processingNumber = 0; //処理件数

		String sql = "UPDATE m_employee SET name = ?, age = ?, section = ? WHERE code = ?";

		// データベースへの接続の取得、PreparedStatementの取得
		try (Connection con = ConnectionManager.getConnection();
				PreparedStatement pstmt = con.prepareStatement(sql)) {
			// DTOからのデータの取り出し
			String code = employee.getCode();
			String name = employee.getName();
			int age = employee.getAge();
			String section = employee.getSection();
			// プレースホルダへの値の設定
			pstmt.setString(1, name);
			pstmt.setInt(2, age);
			pstmt.setString(3, section);
			pstmt.setString(4, code);
			// SQLステートメントの実行
			processingNumber = pstmt.executeUpdate();
		}
		return processingNumber;
	}
}

model.entity.EmployeeBean.java


package model.entity;
import java.io.Serializable;

public class EmployeeBean implements Serializable {
	private String code;
	private String name;
	private int age;
	private String section;

	public EmployeeBean() {

	}
	public String getCode() {
		return code;
	}
	public void setCode(String code) {
		this.code = code;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getSection() {
		return section;
	}
	public void setSection(String section) {
		this.section = section;
	}
}

servlet.EmployeeAlterConfirmServlet.java


package servlet;
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;

@WebServlet("/employee-alter-confirm-servlet")
public class EmployeeAlterConfirmServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public EmployeeAlterConfirmServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// リクエストの転送
		RequestDispatcher rd = request.getRequestDispatcher("employee-alter-confirm.jsp");
		rd.forward(request, response);
	}
}

servlet.EmployeeAlterFormServlet.java


package servlet;
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;

@WebServlet("/employee-alter-form-servlet")
public class EmployeeAlterFormServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public EmployeeAlterFormServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// リクエストの転送
		RequestDispatcher rd = request.getRequestDispatcher("employee-alter-form.jsp");
		rd.forward(request, response);
	}
}

servlet.EmployeeAlterServlet.java


package servlet;
import java.io.IOException;
import java.sql.SQLException;

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 model.dao.EmployeeDAO;
import model.entity.EmployeeBean;

@WebServlet("/employee-alter-servlet")
public class EmployeeAlterServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public EmployeeAlterServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// セッションオブジェクトの取得
		HttpSession session = request.getSession();

		// セッションスコープからの属性値の取得
		EmployeeBean employee = (EmployeeBean) session.getAttribute("employee");

		// DAOの生成
		EmployeeDAO dao = new EmployeeDAO();

		int processingNumber = 0; //処理件数

		try {
			// DAOの利用
			processingNumber = dao.update(employee);
		} catch (ClassNotFoundException | SQLException e) {
			e.printStackTrace();
		}

		// リクエストスコープへの属性の設定
		request.setAttribute("processingNumber", processingNumber);

		// リクエストの転送
		RequestDispatcher rd = request.getRequestDispatcher("employee-alter-result.jsp");
		rd.forward(request, response);
	}
}

servlet.EmployeeDetailServlet.java


package servlet;
import java.io.IOException;
import java.sql.SQLException;

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 model.dao.EmployeeDAO;
import model.entity.EmployeeBean;

@WebServlet("/employee-detail-servlet")
public class EmployeeDetailServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public EmployeeDetailServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		String code = request.getParameter("code");

		// DAOの生成
		EmployeeDAO dao = new EmployeeDAO();

		try {
			EmployeeBean employee = dao.select(code);

			// セッションオブジェクトの取得
			HttpSession session = request.getSession();

			// セッションスコープへの属性の設定
			session.setAttribute("employee", employee);

		} catch (ClassNotFoundException | SQLException e) {
			e.printStackTrace();
		}

		// リクエストの転送
		RequestDispatcher rd = request.getRequestDispatcher("employee-detail.jsp");
		rd.forward(request, response);
	}
}

servlet.EmployeeListServlet.java


package servlet;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

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 model.dao.EmployeeDAO;
import model.entity.EmployeeBean;

@WebServlet("/employee-list-servlet")
public class EmployeeListServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public EmployeeListServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		List＜EmployeeBean> employeeList = null;

		// DAOの生成
		EmployeeDAO dao = new EmployeeDAO();

		try {
			// DAOの利用
			employeeList = dao.selectAll();
		} catch (SQLException | ClassNotFoundException e) {
			e.printStackTrace();
		}

		// リクエストスコープへの属性の設定
		request.setAttribute("employeeList", employeeList);

		// リクエストの転送
		RequestDispatcher rd = request.getRequestDispatcher("employee-list.jsp");
		rd.forward(request, response);
	}
}

employee-alter-confirm.jsp


＜%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.util.List,model.entity.EmployeeBean"%>
＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>従業員情報-変更確認＜/title>
＜/head>
＜body>
	＜%
		request.setCharacterEncoding("UTF-8");
	%>
	従業員情報を以下の内容に変更します。よろしいですか？＜br>
	＜jsp:useBean id="employee" scope="session" class="model.entity.EmployeeBean" />
	＜jsp:setProperty property="name" name="employee" param="name" />
	＜jsp:setProperty property="age" name="employee" param="age" />
	＜jsp:setProperty property="section" name="employee" param="section" />

	コード：＜jsp:getProperty property="code" name="employee" />＜br>
	氏名：＜jsp:getProperty property="name" name="employee" />＜br>
	年齢：＜jsp:getProperty property="age" name="employee" />＜br>
	部署：＜jsp:getProperty property="section" name="employee" />＜br>

	＜form action="employee-alter-servlet" method="POST">
		＜input type="submit" value="変更する">
	＜/form>
	＜form action="employee-alter-form.jsp" method="POST">
		＜input type="submit" value="変更フォームに戻る">
	＜/form>
＜/body>
＜/html>

employee-alter-form.jsp


＜%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.util.List,model.entity.EmployeeBean"%>
＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>従業員情報-変更入力フォーム＜/title>
＜/head>
＜body>
	＜jsp:useBean id="employee" class="model.entity.EmployeeBean" scope="session"/>
	＜form action="employee-alter-confirm.jsp" method="post">
		コード：＜jsp:getProperty property="code" name="employee" />＜br>
		氏名：＜input type="text" name="name"
			value="＜jsp:getProperty property="name" name="employee" />">＜br>
		年齢：＜input type="text" name="age"
			value="＜jsp:getProperty property="age" name="employee" />">＜br>
		部署：＜input type="text" name="section"
			value="＜jsp:getProperty property="section" name="employee" />">＜br>
		＜input type="submit" value="変更する">
	＜/form>
	＜form action="employee-detail-servlet" method="POST">
		＜input type="hidden" name="code" value="＜%=employee.getCode()%>">
		＜input type="submit" value="詳細表示画面に戻る">
	＜/form>
＜/body>
＜/html>

employee-alter-result.jsp


＜%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.util.List,model.entity.EmployeeBean"%>
＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>従業員情報-変更登録結果＜/title>
＜/head>
	＜%
		int processingNumber = (Integer) request.getAttribute("processingNumber");
		if (processingNumber > 0) {
	%>
	次のデータを変更登録しました。＜br>
	＜%
		} else {
	%>
	次のデータを変更登録できませんでした。＜br>
	＜%
		}
	%>
	＜jsp:useBean id="employee" scope="session" class="model.entity.EmployeeBean" />
	コード：＜jsp:getProperty property="code" name="employee" />＜br>
	氏名：＜jsp:getProperty property="name" name="employee" />＜br>
	年齢：＜jsp:getProperty property="age" name="employee" />＜br>
	部署：＜jsp:getProperty property="section" name="employee" />＜br>

	＜form action="menu.html" method="POST">
		＜input type="submit" value="メニュー画面に戻る">
	＜/form>
	＜% session.invalidate(); %>
＜/body>
＜/html>

employee-detail.jsp


＜%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>従業員情報-詳細＜/title>
＜/head>
＜body>
	＜jsp:useBean id="employee" scope="session" class="model.entity.EmployeeBean"/>

	コード：＜jsp:getProperty name="employee" property="code"/>＜br>
	氏名：＜jsp:getProperty name="employee" property="name"/>＜br>
	年齢：＜jsp:getProperty name="employee" property="age"/>＜br>
	部署：＜jsp:getProperty name="employee" property="section"/>＜br>

	＜form action="employee-alter-form.jsp" method="POST">
		＜input type="submit" value="変更する">
	＜/form>

	＜form action="employee-list-servlet" method="POST">
		＜input type="submit" value="一覧表示">
	＜/form>
＜/body>
＜/html>

employee-list.jsp


＜%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.util.List,model.entity.EmployeeBean"%>
＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>従業員情報 一覧＜/title>
＜/head>
＜body>
	＜%
		List＜EmployeeBean> employeeList
			= (List＜EmployeeBean>) request.getAttribute("employeeList");
	%>
	＜table>
		＜tr>
			＜th>コード＜/th>
			＜th>氏名＜/th>
			＜th>＜/th>
		＜/tr>
		＜%
			for (EmployeeBean employee : employeeList) {
		%>
		＜tr>
			＜td><%=employee.getCode()%>＜/td>
			＜td><%=employee.getName()%>＜/td>
			＜td>
				＜form action="employee-detail-servlet" method="POST">
					＜input type="hidden" name="code" value="<%=employee.getCode()%>">
					＜input type="submit" value="詳細表示">
				＜/form>
			＜/td>
		＜/tr>
		＜%
			}
		%>
	＜/table>
＜/body>
＜/html>


＜!DOCTYPE html>
＜html>
＜head>
＜meta charset="UTF-8">
＜title>メニュー＜/title>
＜/head>
＜body>
	＜form action="employee-list-servlet" method="POST">
		＜input type="submit" value="一覧表示">
	＜/form>
＜/body>
＜/html>


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