[EDIT] 二次実装に伴う定数の追加と、AOPのクラスも定数クラスを参照するよう編集しました。

src/main/java/com/example/demo/aop/aspect/SessionCheckAspect.java

@@ -10,6 +10,7 @@ import org.aspectj.lang.annotation.Pointcut;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import com.example.demo.app.presentation.controller.pageproperty.SessionKeyword;
 import com.example.demo.exception.NoSessionException;
 
 
@@ -32,7 +33,7 @@ public class SessionCheckAspect {
 	public void checkSession() {
 		HttpSession session = request.getSession(false);
 
-		if (session == null || session.getAttribute("loginUser") == null) {
+		if (session == null || session.getAttribute(SessionKeyword.LOGIN_USER) == null) {
 			throw new NoSessionException("不正なログインです");
 		}
 

src/main/java/com/example/demo/aop/handler/GlobalExceptionHandler.java

@@ -12,6 +12,8 @@ import org.springframework.web.HttpRequestMethodNotSupportedException;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
+import com.example.demo.app.presentation.controller.pageproperty.PageReturnAttributeKeyword;
+import com.example.demo.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword;
 import com.example.demo.exception.NoSessionException;
 
 @ControllerAdvice
@@ -30,18 +32,18 @@ public class GlobalExceptionHandler {
 		LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE_ILLEGAL_TRANSITION, e);
 
 		model.addAttribute(
-                "errorMessage",
+                PageReturnAttributeKeyword.ERROR_MESSAGE,
                 "システムエラーが発生しました。"
                 + "初めからやり直してください。");
 
-        return "redirect:/login";
+        return TransitionTargetPageNameKeyword.REDIRECT + TransitionTargetPageNameKeyword.LOGIN;
 		
 	}
 
 	@ExceptionHandler(HttpRequestMethodNotSupportedException.class)
 	public String handleBadRequestException(Model model, Exception e, HttpSession session) {
-		model.addAttribute("error", SEVERE_ERROR_MESSAGE_BAD_REQUEST);
+		model.addAttribute(PageReturnAttributeKeyword.ERROR, SEVERE_ERROR_MESSAGE_BAD_REQUEST);
-		model.addAttribute("status", HttpStatus.BAD_REQUEST.value());
+		model.addAttribute(PageReturnAttributeKeyword.STATUS, HttpStatus.BAD_REQUEST.value());
 
 		e.printStackTrace();
 
@@ -50,7 +52,7 @@ public class GlobalExceptionHandler {
 		System.out.println("session invalidated");
     	session.invalidate();
 
-		return "error";
+		return TransitionTargetPageNameKeyword.ERROR_HTML;
 	}
 	
 	@ExceptionHandler(Exception.class)
@@ -60,6 +62,6 @@ public class GlobalExceptionHandler {
 
 		System.out.println("session invalidated exception");
 		session.invalidate();
-		return "error";
+		return TransitionTargetPageNameKeyword.ERROR_HTML;
 	}
 }

src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java

@@ -25,6 +25,8 @@ public class LoginServiceImpl implements LoginService {
 
 		if (userEntity == null) {
 			return null;
+		} else if (userEntity.getDeleteFlag() == 1) {
+			return null;
 		}
 
 		boolean isValidPassword = false;

src/main/java/com/example/demo/app/presentation/controller/GoalController.java

@@ -275,7 +275,7 @@ public class GoalController {
 		
 		int currentAmount = goalService.getCurrentAmount(userId);
 		
-		model.addAttribute("currentAmount", currentAmount);
+		model.addAttribute(PageReturnAttributeKeyword.CURRENT_AMOUNT, currentAmount);
 		
 		return TransitionTargetPageNameKeyword.GOAL_CREATE_HTML;
 	}

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

@@ -4,7 +4,8 @@ public class PageReturnAttributeKeyword {
 
 	public static final String ERROR_MESSAGE = "errorMessage";
 	public static final String MESSAGE = "message";
-	
+	public static final String ERROR = "error";
+	public static final String STATUS = "status";
 	
 	public static final String QUESTION_LIST = "questionList";
 	public static final String USER_FORM = "userForm";

src/main/resources/templates/analysis.html

@@ -35,7 +35,7 @@
 	<table class="table text-center">
         <thead>
 	        <tr>
-                <th scope="col">カテゴリ別</th>
+                <th scope="col"></th>
 			    <th scope="col">支出</th>
 			    <th scope="col">前月比</th>
 			</tr>

src/main/resources/templates/category_list.html

@@ -9,13 +9,13 @@
 	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
 </head>
 
-<body class="pb-5 pt-5">
+<body style="padding-top:80px; padding-bottom:80px;">
 
 	<div th:replace="~{header :: header}"></div>
 	<div class="main-container">
 
 		<div>
-			<ul>
+			<ul class="list-unstyled p-0 m-0">
 				<li class="card shadow-sm mb-3" th:each="categoryForm : ${categoryFormList}">
 					<div class="card-body">
 						<div class="d-flex justify-content-between">
@@ -49,20 +49,30 @@
 
 						</div>
 
-						<hr>
-						<hr>
 					</div>
 				</li>
 			</ul>
 		</div>
 		
-
+		<div class="d-grid mt-4">
 
 			<form th:action="@{/category/create}" method="get">
-			<input type="hidden" name="today" id="today" th:value="${today}">
+
-			<button type="submit">新規登録</button>
+				<input type="hidden"
+			           name="today"
+					   id="today"
+			           th:value="${today}">
+
+			    <button class="btn btn-success w-100" type="submit">
+					新規登録
+				</button>
+
 			</form>
 
+		</div>
+		
+	</div>
+
 		<div th:replace="~{footer :: footer}"></div>
 </body>
 

src/main/resources/templates/category_update.html

@@ -47,7 +47,7 @@
 					<input type="hidden" name="categoryId" th:value="${categoryId}">
 
 					<div class="d-grid">
-						<button type="submit" class="btn btn-primary">登録</button>
+						<button type="submit" class="btn btn-primary">更新</button>
 					</div>
 				</form>
 			</div>

src/main/resources/templates/fixed_cost.html

@@ -10,7 +10,7 @@
 	<link rel="stylesheet" th:href="@{/css/style.css}">
 </head>
 
-<body class="pb-5 pt-5">
+<body style="padding-top:80px; padding-bottom:80px;">
 
 	<div th:replace="~{header :: header}"></div>
 	<div class="main-container">
@@ -19,7 +19,7 @@
 		<h2 class="page-title" th:text="${today}"></h2>
 
 		<div>
-			<ul>
+			<ul class="list-unstyled p-0 m-0">
 				<li th:each="fixedCostForm : ${fixedCostFormList}" class="card shadow-sm mb-3">
 
 					<div class="card-body">
@@ -52,21 +52,29 @@
 
 						</div>
 
-						<hr>
-						<hr>
 					</div>
 				</li>
-		</div>
 			</ul>
 		</div>
+		<div class="d-grid mt-4">
 
+			<form th:action="@{/category/create}" method="get">
 
+				<input type="hidden"
+					   name="today"
+					   id="today"
+					   th:value="${today}">
+
+				<button class="btn btn-success w-100" type="submit">
+			    	新規登録
+				</button>
 
-	<form th:action="@{/fixed-cost/create}" method="get">
-		<input type="hidden" name="today" id="today" th:value="${today}">
-		<button type="submit">新規登録</button>
 			</form>
 
+		</div>
+		
+	</div>
+
 	<div th:replace="~{footer :: footer}"></div>
 </body>
 

src/main/resources/templates/goal_create.html

@@ -52,8 +52,11 @@
 
 				</form>
 				
-				<div th:replace="~{footer :: footer}"></div>
+			</div>
+		</div>
+	</div>
 	
+	<div th:replace="~{footer :: footer}"></div>
 
 </body>
 

src/main/resources/templates/goal_record.html

@@ -8,7 +8,7 @@
 	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
 </head>
 
-<body class="pb-5 pt-5">
+<body style="padding-top:80px; padding-bottom:80px;">
 
 	<div th:replace="~{header :: header}"></div>
 
@@ -74,16 +74,16 @@
 				</ul>
 
 			</div>
+		</div>
+		
 		<div class="d-grid mt-4">
 			<form th:action="@{/goal}" method="get">
-
 				<button class="btn btn-success w-100" type="submit">
 					戻る
 				</button>
-
 			</form>
 		</div>
-		</div>
+		
 	</div>
 
 	<div th:replace="~{footer :: footer}"></div>

src/main/resources/templates/goal_view.html

@@ -189,6 +189,8 @@
 
 	</div>
 
+	<div class="d-grid gap-2 mt-4">
+		
 	<form th:action="@{/goal/create}" method="get">
 
 		<button type="submit" class="btn btn-success w-100">
@@ -205,6 +207,8 @@
 
 	</form>
 	
+	</div>
+
 	<div th:replace="~{footer :: footer}"></div>
 
 </body>

src/main/resources/templates/profile_edit.html

@@ -100,17 +100,17 @@
 		                           min="0"
 								   max="10000000"
 		                           required>
-		                </div>
-
 		                </div>
 						
 						<div class="d-grid">
 							<button type="submit"
 							        class="btn btn-primary">
-	                        確定
+								編集
 							</button>
 						</div>
 
+		        	</div>
+				
 				</form>
 
 		    </div>

src/main/resources/templates/select_course.html

@@ -5,6 +5,7 @@
 	<meta charset="UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+	<link rel="stylesheet" th:href="@{/css/style.css}">
 	<title>コース選択</title>
 </head>
 
@@ -12,13 +13,15 @@
 	<div th:replace="~{header :: header}"></div>
 	<h1 class="page-title">コース選択</h1>
 
+	<div class="d-grid gap-2 mt-4">
 	    <th:block th:if="${mode == 'change'}">
 		    <form th:action="@{/course/create}" method="get">
-			<button type="submit">新規登録</button>
+			    <button class="btn btn-success w-100" type="submit">
+					新規登録
+				</button>
 		    </form>
-
-
 	    </th:block>
+	
 	<form th:action="${mode == 'regist'} ? @{/user/register/return}: @{/change}" method="post">
 		<button type="submit" class="btn btn-primary w-100">確定</button>
 
@@ -53,6 +56,7 @@
 			</div>
 		</div>
 	</form>
+	</div>
 
 	<th:block th:if="${mode=='change'}">
 		<div th:replace="~{footer :: footer}"></div>