段階3です

src/main/java/com/example/rhizome/app/domain/service/UpdateDepartment.java

@@ -0,0 +1,7 @@
+package com.example.rhizome.app.domain.service;
+
+import com.example.rhizome.app.domain.model.Department;
+
+public interface UpdateDepartment {
+	void updateDepartment(Department department);
+}

src/main/java/com/example/rhizome/app/domain/service/impl/UpdateDepartmentImpl.java

@@ -0,0 +1,26 @@
+package com.example.rhizome.app.domain.service.impl;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.rhizome.app.domain.model.Department;
+import com.example.rhizome.app.infra.entity.DepartmentEntity;
+import com.example.rhizome.app.infra.repository.DepartmentRepository;
+
+@Service
+@Transactional
+public class UpdateDepartmentImpl {
+	DepartmentRepository departmentRepository;
+
+	@Autowired
+	public UpdateDepartmentImpl(DepartmentRepository departmentRepository) {
+		this.departmentRepository = departmentRepository;
+	}
+
+	public void updateDepartment(Department department) {
+		// ★考える：Model を Entity に変換（DepartmentEntity.convertFrom）して、Repository の save に渡す
+		departmentRepository.save(DepartmentEntity.convertFrom(department));
+	}
+
+}

src/main/java/com/example/rhizome/app/presentation/controller/UpdateDepartmentController.java

@@ -0,0 +1,85 @@
+package com.example.rhizome.app.presentation.controller;
+
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.servlet.http.HttpSession;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import com.example.rhizome.app.domain.model.Department;
+import com.example.rhizome.app.domain.model.SearchConditionDepartment;
+import com.example.rhizome.app.domain.service.RegisterDepartment;
+import com.example.rhizome.app.domain.service.SearchDepartment;
+import com.example.rhizome.app.domain.service.impl.RegisterDepartmentImpl;
+import com.example.rhizome.app.domain.service.impl.SearchDepartmentImpl;
+import com.example.rhizome.app.presentation.controller.pageproperty.PageReturnAttributeKeyword;
+import com.example.rhizome.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword;
+import com.example.rhizome.app.presentation.form.MessageForm;
+import com.example.rhizome.app.presentation.form.UpdateDepartmentForm;
+
+@Controller
+public class UpdateDepartmentController {
+
+	// ログ出力用インスタンス
+	private final static Logger LOGGER = Logger.getLogger(UpdateEmployeeController.class.getName());
+	// エラーメッセージ用の定数フィールド
+	private final static String SEVERE_ERROR_MESSAGE = "エラーが発生しました！";
+
+	HttpSession httpSession;
+	RegisterDepartment registerDepartment;
+	SearchDepartment searchDepartment;
+
+	@Autowired
+	public UpdateDepartmentController(HttpSession httpSession, RegisterDepartmentImpl registerDepartment,
+			SearchDepartmentImpl searchDepartment) {
+		this.httpSession = httpSession;
+		this.registerDepartment = registerDepartment;
+		this.searchDepartment = searchDepartment;
+	}
+
+	@RequestMapping(value = TransitionTargetPageNameKeyword.SHOW_UPDATE_DEPARTMENT, method = RequestMethod.POST)
+	public String showUpdateDepartment(@RequestParam("idDepartment") Integer idDepartment, Model model) {
+		final String UPDATE_TARGET_ID_NOT_FOUND = "更新対象のデータが見つかりません。";
+		try {
+			// ★① searchDepartment.searchBy(new SearchConditionDepartment(idDepartment, null)) で対象を検索
+			// ★② 結果が空なら MESSAGE_ERROR を載せて "forward:" + SELECT_DEPARTMENT_FORM_EMPTY
+			// ★③ あれば UpdateDepartmentForm.convertFrom(結果の先頭) を
+			//     UPDATE_DEPARTMENT_FORM という名前で model に載せ、UPDATE_DEPARTMENT_INPUT_HTML を返す
+			List<Department> DepartmentList = searchDepartment.searchBy(
+					new SearchConditionDepartment(idDepartment, null));
+
+			// DBに更新対象のデータがあるか
+			if (DepartmentList.isEmpty()) {
+				// ない場合はエラーメッセージをセットして検索画面に戻る
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR,
+						new MessageForm(UPDATE_TARGET_ID_NOT_FOUND));
+				return "forward:" + TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_FORM_EMPTY;
+			}
+			// 更新画面に遷移
+			model.addAttribute(PageReturnAttributeKeyword.UPDATE_DEPARTMENT_FORM,
+					UpdateDepartmentForm.convertFrom(DepartmentList.get(0)));
+
+			// Update画面に遷移
+			return TransitionTargetPageNameKeyword.UPDATE_DEPARTMENT_INPUT_HTML;
+
+		} catch (Exception e) {
+			// ログイン情報の破棄
+			httpSession.invalidate();
+
+			e.printStackTrace();
+
+			// エラーログ出力
+			LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE, e);
+			// エラー画面遷移
+			return TransitionTargetPageNameKeyword.ERROR_HTML;
+
+		}
+	}
+}

src/main/java/com/example/rhizome/app/presentation/controller/UpdateDepartmentResultController.java

@@ -0,0 +1,97 @@
+package com.example.rhizome.app.presentation.controller;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.servlet.http.HttpSession;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import com.example.rhizome.app.domain.service.SearchDepartment;
+import com.example.rhizome.app.domain.service.UpdateDepartment;
+import com.example.rhizome.app.presentation.controller.pageproperty.PageReturnAttributeKeyword;
+import com.example.rhizome.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword;
+import com.example.rhizome.app.presentation.form.DepartmentForm;
+import com.example.rhizome.app.presentation.form.MessageForm;
+import com.example.rhizome.app.presentation.form.UpdateDepartmentForm;
+
+@Controller
+public class UpdateDepartmentResultController {
+
+	// ログ出力用インスタンス
+	private final static Logger LOGGER = Logger.getLogger(UpdateEmployeeController.class.getName());
+	// エラーメッセージ用の定数フィールド
+	private final static String SEVERE_ERROR_MESSAGE = "エラーが発生しました！";
+
+	HttpSession httpSession;
+	SearchDepartment searchDepartment;
+	UpdateDepartment updateDepartment;
+
+	@Autowired
+	public UpdateDepartmentResultController(HttpSession httpSession, SearchDepartment searchDepartment,
+			UpdateDepartment updateDepartment) {
+		this.httpSession = httpSession;
+		this.searchDepartment = searchDepartment;
+		this.updateDepartment = updateDepartment;
+	}
+
+	@RequestMapping(value = TransitionTargetPageNameKeyword.UPDATE_DEPARTMENT_RESULT, method = RequestMethod.POST)
+	public String departmentUpdateResult(@ModelAttribute UpdateDepartmentForm updateDepartmentForm, Model model) {
+
+		final String NOTHING = "項目が空欄です。";
+		final String DUPLICATION = "既に同名の部署が存在するか、値が変更されていません。";
+		final String NO_TARGET = "更新対象のデータが見つかりません。";
+		final String UPDATE_COMPLETE = "更新が完了しました。";
+
+		try {
+			
+			// 部署一覧取得
+            model.addAttribute(PageReturnAttributeKeyword.DEPARTMENT_FORM_LIST, DepartmentForm.convertFrom(searchDepartment.selectAll()));
+			
+            
+           updateDepartmentForm.hasRequiredValue();
+           
+			if(updateDepartmentForm.hasRequiredValue() == false) {
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(NOTHING));
+				model.addAttribute(PageReturnAttributeKeyword.UPDATE_DEPARTMENT_FORM, updateDepartmentForm);
+				return TransitionTargetPageNameKeyword.UPDATE_DEPARTMENT_INPUT_HTML;
+			}
+			
+			if(searchDepartment.searchBy(null) != null){
+				// 存在する場合はエラーメッセージを設定して更新入力画面に遷移
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(DUPLICATION));
+				model.addAttribute(PageReturnAttributeKeyword.UPDATE_DEPARTMENT_FORM, updateDepartmentForm);
+				return TransitionTargetPageNameKeyword.UPDATE_DEPARTMENT_INPUT_HTML;
+			}
+			
+			
+			if(searchDepartment.searchBy(null) != null) {
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(NO_TARGET));
+				model.addAttribute(PageReturnAttributeKeyword.UPDATE_DEPARTMENT_FORM, updateDepartmentForm);
+				return TransitionTargetPageNameKeyword.UPDATE_DEPARTMENT_INPUT_HTML;
+			}
+
+			 // 更新結果のメッセージを画面にセットし一覧画面に遷移
+            model.addAttribute(PageReturnAttributeKeyword.MESSAGE_INFO, new MessageForm(UPDATE_COMPLETE));
+
+            // forward 先で不用意な動作をしないために UpdateEmployeeInfoForm をクリア
+            return "forward:" + TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_FORM_EMPTY;
+
+		} catch (Exception e) {
+			// 他と同じ
+			// ログイン情報の破棄
+			httpSession.invalidate();
+
+			e.printStackTrace();
+			// エラーログ出力
+			LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE, e);
+			// エラー画面遷移
+			return TransitionTargetPageNameKeyword.ERROR_HTML;
+		}
+	}
+}

src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/PageReturnAttributeKeyword.java

@@ -9,6 +9,7 @@ public class PageReturnAttributeKeyword {
     public static final String MESSAGE_INFO = "messageInfo";
 
     public static final String DEPARTMENT_FORM_LIST = "departmentFormList";
+    public static final String UPDATE_DEPARTMENT_FORM = "updateDepartmentForm";
     public static final String UPDATE_EMPLOYEE_INFO_FORM = "updateEmployeeInfoForm";
     public static final String INSERT_EMPLOYEE_FORM = "insertEmployeeForm";
     public static final String LOGIN_INFO_FORM = "loginInfoForm";

src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/TransitionTargetPageNameKeyword.java

@@ -48,6 +48,7 @@ public class TransitionTargetPageNameKeyword {
 	// Department
 	// HTML
 	public static final String SELECT_DEPARTMENT_HTML = "selectDepartment";
+	public static final String UPDATE_DEPARTMENT_INPUT_HTML = "updateDepartmentInput";
 	public static final String INSERT_DEPARTMENT_INPUT_HTML = "insertDepartmentInput";
 	public static final String INSERT_DEPARTMENT_CONFIRM_HTML = "insertDepartmentConfirm";
 	public static final String INSERT_DEPARTMENT_RESULT_HTML = "insertDepartmentResult";
@@ -55,6 +56,8 @@ public class TransitionTargetPageNameKeyword {
 	// Controller
 	public static final String SELECT_DEPARTMENT = "/selectDepartment";
 	public static final String SELECT_DEPARTMENT_FORM_EMPTY = "/selectAll2";
+	public static final String SHOW_UPDATE_DEPARTMENT = "/showUpdateDepartment";
+	public static final String UPDATE_DEPARTMENT_RESULT = "/updateDepartmentResult";
 	public static final String INSERT_DEPARTMENT_INPUT = "/insertDepartmentInput";
 	public static final String DELETE_DEPARTMENT = "/deleteDepartment";
 
@@ -82,7 +85,10 @@ public class TransitionTargetPageNameKeyword {
 				UPDATE_EMPLOYEE_RESULT,
 				SELECT_DEPARTMENT,
 				SELECT_DEPARTMENT_FORM_EMPTY,
-				INSERT_DEPARTMENT_INPUT);
+				INSERT_DEPARTMENT_INPUT,
+				SHOW_UPDATE_DEPARTMENT,
+				SHOW_UPDATE_DEPARTMENT);
+
 	}
 
 	/**

src/main/java/com/example/rhizome/app/presentation/form/UpdateDepartmentForm.java

@@ -0,0 +1,32 @@
+package com.example.rhizome.app.presentation.form;
+
+import com.example.rhizome.app.domain.model.Department;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class UpdateDepartmentForm {
+	private Integer idDepartment;
+	private String nmDepartment;
+
+	/** Model(Department) → Form */
+	public static UpdateDepartmentForm convertFrom(Department department) {
+		return new UpdateDepartmentForm(department.getIdDepartment(), department.getNmDepartment());
+	}
+
+	/** Form → Model(Department) */
+	public static Department convertTo(UpdateDepartmentForm form) {
+		return new Department(form.getIdDepartment(), form.getNmDepartment());
+	}
+
+	/** 必須チェック。true：OK／false：部署ID か部署名が空 */
+	public boolean hasRequiredValue() {
+		// ★考える：idDepartment が null でなく、nmDepartment が null でも空白だけでもない
+		if(idDepartment != null && nmDepartment.isBlank() && nmDepartment.isEmpty());
+		return false;
+	}
+}

src/main/resources/templates/updateDepartmentInput.html

@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+
+<head>
+	<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
+	<!-- 外部のスクリプトファイルを読み込む -->
+	<script th:src="@{/js/common.js}"></script>
+	<!-- CSSの読み込み -->
+	<link rel="stylesheet" th:href="@{/css/all.css}">
+	<link rel=stylesheet th:href="@{/css/style.css}" type="text/css">
+	<title>部署登録更新</title>
+</head>
+
+<body>
+	<h1>
+		社員情報更新　　　
+		<div class="rightSection">
+			<span class="loginInfo">ログイン者名：<span th:text="${session.loginUser.nmEmployee}"></span></span>
+			<button class="logoutButton" onclick="logoutSubmit()">ログアウト</button>
+		</div>
+	</h1>
+	<form action="updateDepartmentResult" method="post" onsubmit="return confirm('本当によろしいですか？');"
+		th:object="${updateDepartmentForm}">
+
+		<div class="msgBox error" th:if="${messageError != null}">
+			<span class="error" th:text="${messageError.message}"></span>
+		</div>
+		<table>
+			<tr>
+				<th class="header">部署ID</th>
+				<td>
+					<input class="readOnly" readonly="readonly" th:field="*{idDepartment}" type="text" />
+				</td>
+			</tr>
+			<tr>
+				<th class="header">部署名</th>
+				<td>
+					<input maxlength="50" placeholder="部署名" required="required" th:field="*{nmDepartment}"
+						type="text" />
+				</td>
+			</tr>
+			<tr>
+				<td class="btnArea" colspan="2"><input type="submit" value="更新" /></td>
+			</tr>
+		</table>
+	</form>
+	<a href="javascript:selectDepartmentSubmit()">一覧に戻る</a>
+	<script type="text/javascript">
+		function selectDepartmentSubmit() {
+			const form = document.createElement('form');
+			form.setAttribute('method', 'post');
+			form.setAttribute('action', 'selectDepartment');
+			document.body.appendChild(form);
+			form.submit();
+		}
+	</script>
+</body>
+
+</html>