[EDIT] 改行・コード位置を調整しました。

Attribute・オブジェクトの型を修正しました。

src/main/java/com/example/demo/app/domain/model/TransactionModel.java

@@ -3,7 +3,9 @@ package com.example.demo.app.domain.model;
 import java.time.LocalDate;
 import java.util.List;
 
+import com.example.demo.app.infra.entity.CategoryEntity;
 import com.example.demo.app.infra.entity.TransactionEntity;
+import com.example.demo.app.infra.entity.UserEntity;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -35,4 +37,13 @@ public class TransactionModel {
 		return transactionEntityList.stream().map(TransactionModel::convertFrom).toList();
 	}
 	
+	public static TransactionEntity convertTo(TransactionModel transactionModel, UserEntity userEntity, CategoryEntity categoryEntity) {
+		return new TransactionEntity(
+				transactionModel.getTransactionId(),
+				userEntity,
+				categoryEntity,
+				transactionModel.getAmount(),
+				transactionModel.getTransactionDate());
+	}
+	
 }

src/main/java/com/example/demo/app/domain/service/CategoryService.java

@@ -9,4 +9,6 @@ public interface CategoryService {
 	public List<CategoryModel> findAll();
 	
 	public CategoryModel findOne(Long categoryId);
+	
+	public CategoryModel findOneByCategoryName(String categoryName);
 }

src/main/java/com/example/demo/app/domain/service/TransactionService.java

@@ -16,4 +16,8 @@ public interface TransactionService {
 	
 	public int findTotalexpense(LocalDate startDate, LocalDate endDate, Long userId);
 	
+	public int createTransaction(TransactionModel transactionModel);
+	
+	public int updateTransaction(TransactionModel transactionModel);
+	
 }

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

@@ -14,26 +14,38 @@ import lombok.RequiredArgsConstructor;
 
 @Service
 @RequiredArgsConstructor
-public class CategoryServiceImpl implements CategoryService{
+public class CategoryServiceImpl implements CategoryService {
 
 	private final CategoryRepository categoryRepository;
-	
+
 	public List<CategoryModel> findAll() {
-		
+
 		return CategoryModel.convertFrom(categoryRepository.findAll());
-		
+
 	}
-	
+
 	public CategoryModel findOne(Long categoryId) {
-		
+
 		Optional<CategoryEntity> optionalCategoryModel = categoryRepository.findById(categoryId);
-		
+
 		if (optionalCategoryModel.isEmpty()) {
 			return null;
 		}
-		
+
 		return CategoryModel.convertFrom(optionalCategoryModel.get());
-		
+
 	}
-	
+
+	public CategoryModel findOneByCategoryName(String categoryName) {
+
+		CategoryEntity categoryModel = categoryRepository.findByCategoryName(categoryName);
+
+		if (categoryModel == null) {
+			return null;
+		}
+
+		return CategoryModel.convertFrom(categoryModel);
+
+	}
+
 }

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

@@ -3,14 +3,19 @@ package com.example.demo.app.domain.service.impl;
 import java.time.LocalDate;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 import org.springframework.stereotype.Service;
 
 import com.example.demo.app.domain.model.TransactionModel;
 import com.example.demo.app.domain.service.TransactionService;
+import com.example.demo.app.infra.entity.CategoryEntity;
 import com.example.demo.app.infra.entity.TransactionEntity;
+import com.example.demo.app.infra.entity.UserEntity;
+import com.example.demo.app.infra.repository.CategoryRepository;
 import com.example.demo.app.infra.repository.TransactionRepository;
+import com.example.demo.app.infra.repository.UserRepository;
 
 import lombok.RequiredArgsConstructor;
 
@@ -19,6 +24,8 @@ import lombok.RequiredArgsConstructor;
 public class TransactionServiceImpl implements TransactionService {
 
 	private final TransactionRepository transactionRepository;
+	private final UserRepository userRepository;
+	private final CategoryRepository categoryRepository;
 
 	public Map<LocalDate, List<TransactionModel>> findAllByDate(LocalDate startDate, LocalDate endDate, Long userId) {
 
@@ -34,16 +41,17 @@ public class TransactionServiceImpl implements TransactionService {
 		return transactionModelMap;
 
 	}
-	
+
 	public int findTotalIncome(LocalDate startDate, LocalDate endDate, Long userId) {
-		
+
 		return transactionRepository.findTotalIncome(startDate, endDate, userId);
-		
+
 	}
+
 	public int findTotalexpense(LocalDate startDate, LocalDate endDate, Long userId) {
-		
+
 		return transactionRepository.findTotalIncome(startDate, endDate, userId);
-		
+
 	}
 
 	public List<TransactionModel> findByUserIdAndDate(LocalDate todayDate, Long userId) {
@@ -52,4 +60,59 @@ public class TransactionServiceImpl implements TransactionService {
 
 	}
 
+	public int createTransaction(TransactionModel transactionModel) {
+
+		Optional<UserEntity> userEntityOptional = userRepository.findById(transactionModel.getUserId());
+
+		if (userEntityOptional.isEmpty()) {
+			return -1;
+		}
+
+		Optional<CategoryEntity> categoryEntityOptional = categoryRepository.findById(transactionModel.getCategoryId());
+		if (categoryEntityOptional.isEmpty()) {
+			return -1;
+		}
+
+		TransactionEntity transactionEntity = TransactionModel.convertTo(
+				transactionModel,
+				userEntityOptional.get(),
+				categoryEntityOptional.get());
+		if (transactionRepository.save(transactionEntity) != null) {
+			return 0;
+
+		} else {
+			return -1;
+		}
+
+	}
+
+	public int updateTransaction(TransactionModel transactionModel) {
+
+		if (!transactionRepository.existsById(transactionModel.getTransactionId())) {
+			return -1;
+		}
+		
+		Optional<UserEntity> userEntityOptional = userRepository.findById(transactionModel.getUserId());
+
+		if (userEntityOptional.isEmpty()) {
+			return -1;
+		}
+
+		Optional<CategoryEntity> categoryEntityOptional = categoryRepository.findById(transactionModel.getCategoryId());
+		if (categoryEntityOptional.isEmpty()) {
+			return -1;
+		}
+
+		TransactionEntity transactionEntity = TransactionModel.convertTo(
+				transactionModel,
+				userEntityOptional.get(),
+				categoryEntityOptional.get());
+		if (transactionRepository.save(transactionEntity) != null) {
+			return 0;
+
+		} else {
+			return -1;
+		}
+
+	}
 }

src/main/java/com/example/demo/app/infra/entity/TransactionEntity.java

@@ -27,6 +27,14 @@ public class TransactionEntity {
 	@GeneratedValue(strategy = GenerationType.IDENTITY)
 	@Column(name = "transaction_id")
 	private Long transactionId;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "user_id")
+	private UserEntity userEntity;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "category_id")
+	private CategoryEntity categoryEntity;
 	
 	@Column(name = "amount", nullable = false)
 	private Integer amount;
@@ -34,12 +42,4 @@ public class TransactionEntity {
 	@Column(name = "transaction_date", nullable = false)
 	private LocalDate transactionDate;
 
-	@ManyToOne(fetch = FetchType.LAZY)
-	@JoinColumn(name = "user_id")
-	private UserEntity userEntity;
-	
-	@ManyToOne(fetch = FetchType.LAZY)
-	@JoinColumn(name = "category_id")
-	private CategoryEntity categoryEntity;
-
 }

src/main/java/com/example/demo/app/infra/repository/CategoryRepository.java

@@ -1,9 +1,15 @@
 package com.example.demo.app.infra.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import com.example.demo.app.infra.entity.CategoryEntity;
 
 public interface CategoryRepository extends JpaRepository<CategoryEntity, Long> {
 	
+	
+	@Query("select c from CategoryEntity c where c.categoryName = :categoryName")
+	public CategoryEntity findByCategoryName(@Param("categoryName") String categoryName);
+	
 }

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

@@ -11,8 +11,11 @@ import jakarta.servlet.http.HttpSession;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 
+import com.example.demo.app.domain.model.LoginModel;
 import com.example.demo.app.domain.service.CategoryService;
 import com.example.demo.app.domain.service.TransactionService;
 import com.example.demo.app.presentation.form.CategoryForm;
@@ -26,27 +29,32 @@ public class TransactionController {
 
 	private final TransactionService transactionService;
 	private final CategoryService categoryService;
-
 	// 一覧画面
 
 	@GetMapping("/transaction/list")
-	public String transactionList(@RequestParam LocalDate startDate, @RequestParam LocalDate endDate, Model model,
+	public String transactionList(@RequestParam(required = false) LocalDate startDates,
+			@RequestParam(required = false) LocalDate endDates, Model model,
 			HttpSession session) {
 
-		LoginUser loginUser = (LoginUser) session.getAttribute("loginUser");
+		LocalDate startDate = (startDates == null) ? LocalDate.now().withDayOfMonth(1) : startDates;
+
+		LocalDate endDate = (endDates == null) ? LocalDate.now().withDayOfMonth(LocalDate.now().lengthOfMonth())
+				: endDates;
+
+		LoginModel loginUser = (LoginModel) session.getAttribute("loginUser");
 
 		Map<LocalDate, List<TransactionForm>> transactionFormMap = new HashMap<>();
-		
+
-		
+		transactionService.findAllByDate(startDate, endDate, loginUser.getUserId()).forEach((date, list) -> {
-		transactionService.findAll(startDate, endDate, loginUser.getUserId).forEach((date, list) -> {
 			List<TransactionForm> transactionFormList = list.stream().map(transaction -> {
 				TransactionForm transactionForm = TransactionForm.convertFrom(
 						transaction,
-						CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId())).getCategoryName(),
+						CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId()))
-						transactionService.findTotalexpense(startDate, endDate, loginUser.getUserId),
+								.getCategoryName(),
-						transactionService.findTotalIncome(startDate, endDate, loginUser.getUserId),
+						transactionService.findTotalexpense(startDate, endDate, loginUser.getUserId()),
-						CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId())).getTransactionType()
+						transactionService.findTotalIncome(startDate, endDate, loginUser.getUserId()),
-						);
+						CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId()))
+								.getTransactionType());
 				return transactionForm;
 			}).collect(Collectors.toList());
 			transactionFormMap.put(date, transactionFormList);
@@ -59,25 +67,64 @@ public class TransactionController {
 
 	// 詳細画面
 	@GetMapping()
-	public String findOne(@RequestParam LocalDate todayDate, Model model, HttpSession session) {
+	public String findOne(@RequestParam(required = false) LocalDate todayDates, Model model, HttpSession session) {
 
-		LoginUser loginUser = (LoginUser) session.getAttribute("loginUser");
+		LocalDate todayDate = (todayDates == null) ? LocalDate.now() : todayDates;
-		
-		List<TransactionForm> transactionFormList = transactionService.findByUserIdAndDate(todayDate, ((LoginUser)session.getAttribute("loginUser")).getUserId).stream().map(transaction -> {
-			TransactionForm transactionForm = TransactionForm.convertFrom(
-					transaction,
-					CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId())).getCategoryName(),
-					transactionService.findTotalexpense(todayDate, todayDate, loginUser.getUserId),
-					transactionService.findTotalIncome(todayDate, todayDate, loginUser.getUserId),
-					CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId())).getTransactionType()
-					);
-			return transactionForm;
-		}).collect(Collectors.toList());
 		
 		
+		LoginModel loginUser = (LoginModel) session.getAttribute("loginUser");
+
+		List<TransactionForm> transactionFormList = transactionService
+				.findByUserIdAndDate(todayDate, loginUser.getUserId()).stream()
+				.map(transaction -> {
+					TransactionForm transactionForm = TransactionForm.convertFrom(
+							transaction,
+							CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId()))
+									.getCategoryName(),
+							transactionService.findTotalexpense(todayDate, todayDate, loginUser.getUserId()),
+							transactionService.findTotalIncome(todayDate, todayDate, loginUser.getUserId()),
+							CategoryForm.convertFrom(categoryService.findOne(transaction.getCategoryId()))
+									.getTransactionType());
+					return transactionForm;
+				}).collect(Collectors.toList());
+
 		model.addAttribute("transactionFormList", transactionFormList);
 
 		return "";
 	}
 
+	@GetMapping("")
+	public String createOneGet(@ModelAttribute TransactionForm transactionForm) {
+
+		return "";
+	}
+
+	@PostMapping()
+	public String createOnePost(@ModelAttribute TransactionForm transactionForm, Model model) {
+
+		if (transactionService.createTransaction(TransactionForm.convertTo(transactionForm)) != 0) {
+			return "error";
+		}
+
+		return "";
+
+	}
+
+	@GetMapping("")
+	public String updateOneGet(@ModelAttribute TransactionForm transactionForm) {
+
+		return "";
+	}
+
+	@PostMapping()
+	public String updateOnePost(@ModelAttribute TransactionForm transactionForm, Model model) {
+
+		if (transactionService.updateTransaction(TransactionForm.convertTo(transactionForm)) != 0) {
+			return "error";
+		}
+
+		return "";
+
+	}
+
 }

src/main/java/com/example/demo/app/presentation/form/TransactionForm.java

@@ -32,6 +32,7 @@ public class TransactionForm {
 	
 	private Integer transactionType;
 	
+	
 	public static TransactionForm convertFrom(TransactionModel transactionModel, String categoryName, int income, int expense, int transactionType) {
 		return new TransactionForm(
 				transactionModel.getTransactionId(),
@@ -45,6 +46,7 @@ public class TransactionForm {
 				transactionType);
 	}
 
+
 	public static List<TransactionForm> convertFrom(List<TransactionModel> transactionModelList, String categoryName, int income, int expense, int transactionType ) {
 		return transactionModelList.stream().map(transactionModel -> TransactionForm.convertFrom(transactionModel, categoryName, income, expense, transactionType)).toList();
 	}