[EDIT]支出分析のためのサービス実装部分を記述しました。

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

@@ -1,9 +1,21 @@
 package com.example.demo.app.domain.service.impl;
 
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.stereotype.Service;
 
 import com.example.demo.app.domain.model.AnalysisModel;
+import com.example.demo.app.domain.model.CategoryAnalysisModel;
 import com.example.demo.app.domain.service.AnalysisService;
+import com.example.demo.app.infra.entity.AllocationEntity;
+import com.example.demo.app.infra.entity.CategoryEntity;
+import com.example.demo.app.infra.entity.UserEntity;
+import com.example.demo.app.infra.repository.AllocationRepository;
+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;
 
@@ -12,29 +24,119 @@ import lombok.RequiredArgsConstructor;
 public class AnalysisServiceImpl implements AnalysisService {
 	
 	//Repositoryの呼び出し
-//	private final TransactionRepository transactionRepository;
-//	private final AllocationRepository allocationRepository;
-//	private final UserRepository userRepository;
-//	private final CategoryRepository categoryRepository;
+	private final TransactionRepository transactionRepository;
+	private final AllocationRepository allocationRepository;
+	private final UserRepository userRepository;
+	private final CategoryRepository categoryRepository;
 	
 	@Override
 	public AnalysisModel getAnalysis(Long userId) {
 		
 		// ユーザー情報取得、月別使用可能資金取得
+		UserEntity userEntity = userRepository.findById(userId).orElseThrow();
+		
+		// コースID取得
+		Long courseId = userEntity.getCourseEntity().getCourseId();
+		
+		// 月別使用可能資金取得
+		Integer monthlyBudget =userEntity.getMonthlyBudget();
 		
 		// 今月の期間取得
-		// 前月の期間取得
-		// 今月の支出取得
-		// 前月の支出取得
-		// コース配分取得
-		// カテゴリ別集計
-		// 前月との差額集計
-		//総支出算出
-		// コース限度額算出、コース別差額算出
-		// CategoryAnalysisModel生成
-		// AnalysisModelの生成
+		LocalDate currentMonthStartDate = LocalDate.now().withDayOfMonth(1);
+		LocalDate currentMonthEndDate = LocalDate.now().withDayOfMonth(LocalDate.now().lengthOfMonth());
 		
-		return null;
+		// 前月の期間取得
+		LocalDate previousMonthStartDate = LocalDate.now().minusMonths(1).withDayOfMonth(1);
+		LocalDate previousMonthEndDate = LocalDate.now().minusMonths(1).withDayOfMonth(LocalDate.now().minusMonths(1).lengthOfMonth());
+		
+		// 今月の支出取得
+		Integer currentMonthTotalAmount = transactionRepository.findTotalExpense(currentMonthStartDate, currentMonthEndDate, userId);
+		
+		if (currentMonthTotalAmount == null) {
+		    currentMonthTotalAmount = 0;
+		}
+		
+		// 前月の支出取得
+		Integer previousMonthTotalAmount = transactionRepository.findTotalExpense(previousMonthStartDate, previousMonthEndDate, userId);
+		
+		if (previousMonthTotalAmount == null) {
+		    previousMonthTotalAmount = 0;
+		}
+		
+		//総支出差額算出
+		Integer totalDifferenceAmount = currentMonthTotalAmount - previousMonthTotalAmount;
+		
+		//カテゴリ一覧取得
+		List<CategoryAnalysisModel> categoryAnalysisModelList = new ArrayList<>();
+		List<CategoryEntity> categoryEntityList = categoryRepository.findAll();
+		List<AllocationEntity> allocationEntityList = allocationRepository.findByCourseEntity_CourseId(courseId);
+		
+		//取得ループ
+		for (CategoryEntity categoryEntity : categoryEntityList) {
+			
+			if (categoryEntity.getTransactionType() != 0) {
+				continue;
+			}
+			// カテゴリ別今月金額取得
+			Integer currentMonthAmount = 
+					transactionRepository.findCategoryExpense(currentMonthStartDate,
+					currentMonthEndDate,
+					userId,
+					categoryEntity.getCategoryId());
+			
+			// カテゴリ別前月金額取得
+			Integer previousMonthAmount = 
+					transactionRepository.findCategoryExpense(previousMonthStartDate,
+					previousMonthEndDate,
+					userId,
+					categoryEntity.getCategoryId());
+			
+			if (currentMonthAmount == null) {
+				currentMonthAmount = 0;
+			}
+			
+			if (previousMonthAmount == null) {
+				previousMonthAmount = 0;
+			}
+			
+			// カテゴリ別前月差額算出
+			Integer monthDifferenceAmount = currentMonthAmount - previousMonthAmount;
+			
+			// コース配分取得
+			AllocationEntity allocationEntity = allocationEntityList.stream().filter(allocation -> 
+			allocation.getCategoryEntity()
+			.getCategoryId()
+			.equals(categoryEntity.getCategoryId()))
+			.findFirst()
+			.orElse(null);
+			
+			Integer allocationRatio = 0;
+			
+			if (allocationEntity != null) {
+				allocationRatio =
+				allocationEntity.getAllocationRatio();
+			}
+			
+			// コース限度額算出
+			Integer courseLimitAmount = monthlyBudget * allocationRatio / 100;
+			
+			// コース差額算出
+			Integer courseDifferenceAmount = currentMonthAmount - courseLimitAmount;
+			
+			// CategoryAnalysisModel生成
+			CategoryAnalysisModel categoryAnalysisModel = new CategoryAnalysisModel(
+					categoryEntity.getCategoryName(),
+					currentMonthAmount,
+					previousMonthAmount,
+					monthDifferenceAmount,
+					courseLimitAmount,
+					courseDifferenceAmount);
+			
+			categoryAnalysisModelList.add(categoryAnalysisModel);
+		}
+		
+		// AnalysisModelの生成
+		return new AnalysisModel(currentMonthTotalAmount, previousMonthTotalAmount, totalDifferenceAmount, categoryAnalysisModelList);
 	}
 
 }