diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/CreateNoteRequest.java b/src/main/java/com/example/copykamanotes/model/dto/note/CreateNoteRequest.java
new file mode 100644
index 0000000..ec30c08
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/CreateNoteRequest.java
@@ -0,0 +1,27 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+
+/**
+ * 发布笔记请求DTO
+ */
+@Data
+public class CreateNoteRequest {
+    /*
+     * 问题ID
+     */
+    @NotNull(message = "问题 ID 不能为空")
+    @Min(value = 1, message = "问题 ID 必须为正整数")
+    private Integer questionId;
+
+    /*
+     * 笔记内容
+     */
+    @NotBlank(message = "笔记内容不能为空")
+    @NotNull(message = "笔记内容不能为空")
+    private String content;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/NoteHeatMapItem.java b/src/main/java/com/example/copykamanotes/model/dto/note/NoteHeatMapItem.java
new file mode 100644
index 0000000..64d66b2
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/NoteHeatMapItem.java
@@ -0,0 +1,12 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+import java.time.LocalDate;
+
+@Data
+public class NoteHeatMapItem {
+    private LocalDate data;
+    private Integer count;
+    private Integer rank;
+}
diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/NoteQueryParams.java b/src/main/java/com/example/copykamanotes/model/dto/note/NoteQueryParams.java
new file mode 100644
index 0000000..6b175b3
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/NoteQueryParams.java
@@ -0,0 +1,81 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+import javax.validation.constraints.Max;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Pattern;
+
+/**
+ * 笔记查询参数DTO
+ */
+@Data
+public class NoteQueryParams {
+    /*
+     * 问题ID
+     * 必须是正整数
+     */
+    @Min(value = 1, message = "问题ID必须是正整数")
+    private Integer questionId;
+
+    /*
+     * 作者ID
+     * 必须是正整数且符合系统生成的范围
+     */
+    @Min(value = 1, message = "作者ID必须是正整数")
+    private Long authorId;
+
+    /*
+     * 收藏夹ID
+     * 必须是正整数
+     */
+    @Min(value = 1, message = "收藏夹ID必须是正整数")
+    private Integer collectionId;
+
+    /*
+     * 排序字段
+     * 只能是固定的枚举值（比如 "create", "update"）。
+     */
+    @Pattern(
+            regexp = "create",
+            message = "create"
+    )
+    private String sort;
+
+    /*
+     * 排序方向
+     * 只能是 "asc" 或 "desc"，区分大小写。
+     */
+    @Pattern(
+            regexp = "asc|desc",
+            message = "排序方向必须是 asc 或 desc"
+    )
+    private String order;
+
+    /*
+     * 最近天数
+     * 必须是1到365之间的整数，默认限制为一年内。
+     */
+    @Min(value = 1, message = "最近天数必须至少为1天")
+    @Max(value = 365, message = "最近天数不能超过365天")
+    private Integer recentDays;
+
+    /*
+     * 当前页码
+     * 必须是正整数，默认为1。
+     */
+    @NotNull(message = "当前页码不能为空")
+    @Min(value = 1, message = "当前页码必须大于等于1")
+    @Max(value = 10000, message = "当前页码不能超过10,000")
+    private Integer page = 1;
+
+    /*
+     * 每页大小
+     * 必须是正整数，限制范围在 1到100之间。
+     */
+    @NotNull(message = "每页大小不能为空")
+    @Min(value = 1, message = "每页大小必须大于等于1")
+    @Max(value = 200, message = "每页大小不能超过100")
+    private Integer pageSize = 10;
+}
diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/NoteRankListItem.java b/src/main/java/com/example/copykamanotes/model/dto/note/NoteRankListItem.java
new file mode 100644
index 0000000..4223167
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/NoteRankListItem.java
@@ -0,0 +1,8 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+@Data
+public class NoteRankListItem {
+
+}
diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/Top3Count.java b/src/main/java/com/example/copykamanotes/model/dto/note/Top3Count.java
new file mode 100644
index 0000000..57e5c4e
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/Top3Count.java
@@ -0,0 +1,10 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+@Data
+public class Top3Count {
+    private Integer lastMonthTop3Count;
+    private Integer thisMonthTop3Count;
+}
+
diff --git a/src/main/java/com/example/copykamanotes/model/dto/note/UpdateNoteRequest.java b/src/main/java/com/example/copykamanotes/model/dto/note/UpdateNoteRequest.java
new file mode 100644
index 0000000..651178c
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/dto/note/UpdateNoteRequest.java
@@ -0,0 +1,16 @@
+package com.example.copykamanotes.model.dto.note;
+
+import lombok.Data;
+
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+
+@Data
+public class UpdateNoteRequest {
+    /*
+     * 笔记内容
+     */
+    @NotNull(message = "笔记内容不能为空")
+    @NotBlank(message = "笔记内容不能为空")
+    private String content;
+}
diff --git a/src/main/java/com/example/copykamanotes/model/entity/Note.java b/src/main/java/com/example/copykamanotes/model/entity/Note.java
new file mode 100644
index 0000000..0cadfd4
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/entity/Note.java
@@ -0,0 +1,60 @@
+package com.example.copykamanotes.model.entity;
+
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * @ClassName Note
+ * @Description 笔记实体类
+ * @Author Tong
+ * @LastChangeDate 2024-12-16 20:01
+ * @Version v1.0
+ */
+@Data
+public class Note {
+    /**
+     * 笔记ID
+     */
+    private Integer noteId;
+
+    /**
+     * 作者ID
+     */
+    private Long authorId;
+
+    /**
+     * 问题ID
+     */
+    private Integer questionId;
+
+    /**
+     * 笔记内容
+     */
+    private String content;
+
+    /**
+     * 点赞数
+     */
+    private Integer likeCount;
+
+    /**
+     * 评论数
+     */
+    private Integer commentCount;
+
+    /**
+     * 收藏数
+     */
+    private Integer collectCount;
+
+    /**
+     * 创建时间
+     */
+    private LocalDateTime createdAt;
+
+    /**
+     * 更新时间
+     */
+    private LocalDateTime updatedAt;
+}
diff --git a/src/main/java/com/example/copykamanotes/model/vo/note/CreateNoteVO.java b/src/main/java/com/example/copykamanotes/model/vo/note/CreateNoteVO.java
new file mode 100644
index 0000000..b9b15eb
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/vo/note/CreateNoteVO.java
@@ -0,0 +1,9 @@
+package com.example.copykamanotes.model.vo.note;
+
+import lombok.Data;
+
+@Data
+public class CreateNoteVO {
+    private Integer noteId;
+}
+
diff --git a/src/main/java/com/example/copykamanotes/model/vo/note/DownloadNoteVO.java b/src/main/java/com/example/copykamanotes/model/vo/note/DownloadNoteVO.java
new file mode 100644
index 0000000..bf906ad
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/vo/note/DownloadNoteVO.java
@@ -0,0 +1,8 @@
+package com.example.copykamanotes.model.vo.note;
+
+import lombok.Data;
+
+@Data
+public class DownloadNoteVO {
+    private String markdown;
+}
diff --git a/src/main/java/com/example/copykamanotes/model/vo/note/NoteVO.java b/src/main/java/com/example/copykamanotes/model/vo/note/NoteVO.java
new file mode 100644
index 0000000..d37bb18
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/model/vo/note/NoteVO.java
@@ -0,0 +1,39 @@
+package com.example.copykamanotes.model.vo.note;
+
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+@Data
+public class NoteVO {
+    private Integer noteId;
+    private String content;
+    private Boolean needCollapsed = false;
+    private String displayContent;
+    private Integer likeCount;
+    private Integer commentCount;
+    private Integer collectCount;
+    private LocalDateTime createdAt;
+    private SimpleAuthorVO author;
+    private UserActionsVO userActions;
+    private SimpleQuestionVO question;
+
+    @Data
+    public static class SimpleAuthorVO {
+        private Long userId;
+        private String username;
+        private String avatarUrl;
+    }
+
+    @Data
+    public static class UserActionsVO {
+        private Boolean isLiked = false;
+        private Boolean isCollected = false;
+    }
+
+    @Data
+    public static class SimpleQuestionVO {
+        private Integer questionId;
+        private String title;
+    }
+}
diff --git a/src/main/java/com/example/copykamanotes/service/CategoryService.java b/src/main/java/com/example/copykamanotes/service/CategoryService.java
new file mode 100644
index 0000000..974616c
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/CategoryService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface CategoryService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/CollectionNoteService.java b/src/main/java/com/example/copykamanotes/service/CollectionNoteService.java
new file mode 100644
index 0000000..4c6f87a
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/CollectionNoteService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface CollectionNoteService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/CollectionService.java b/src/main/java/com/example/copykamanotes/service/CollectionService.java
new file mode 100644
index 0000000..1dd9cf3
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/CollectionService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface CollectionService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/CommentService.java b/src/main/java/com/example/copykamanotes/service/CommentService.java
new file mode 100644
index 0000000..5759462
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/CommentService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface CommentService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/MessageService.java b/src/main/java/com/example/copykamanotes/service/MessageService.java
new file mode 100644
index 0000000..124c67f
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/MessageService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface MessageService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/NoteCommentService.java b/src/main/java/com/example/copykamanotes/service/NoteCommentService.java
new file mode 100644
index 0000000..e6b8f3f
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/NoteCommentService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface NoteCommentService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/NoteLikeService.java b/src/main/java/com/example/copykamanotes/service/NoteLikeService.java
new file mode 100644
index 0000000..a38f780
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/NoteLikeService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface NoteLikeService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/NoteService.java b/src/main/java/com/example/copykamanotes/service/NoteService.java
new file mode 100644
index 0000000..3d9e603
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/NoteService.java
@@ -0,0 +1,28 @@
+package com.example.copykamanotes.service;
+
+import com.example.copykamanotes.model.base.ApiResponse;
+import com.example.copykamanotes.model.base.EmptyVO;
+import com.example.copykamanotes.model.dto.note.*;
+import com.example.copykamanotes.model.vo.note.CreateNoteVO;
+import com.example.copykamanotes.model.vo.note.DownloadNoteVO;
+import com.example.copykamanotes.model.vo.note.NoteVO;
+
+import java.util.List;
+
+public interface NoteService {
+    ApiResponse<List<NoteVO>> getNotes(NoteQueryParams noteQueryParams);
+
+    ApiResponse<CreateNoteVO> createNote(CreateNoteRequest createNoteRequest);
+
+    ApiResponse<EmptyVO> updateNote(Integer noteId, UpdateNoteRequest updateNoteRequest);
+
+    ApiResponse<EmptyVO> deleteNote(Integer noteId);
+
+    ApiResponse<DownloadNoteVO> downloadNote(Integer noteId);
+
+    ApiResponse<List<NoteRankListItem>> submitNoteRank();
+
+    ApiResponse<List<NoteHeatMapItem>> submitNoteHeatMap();
+
+    ApiResponse<Top3Count> submitNoteTop3Count();
+}
diff --git a/src/main/java/com/example/copykamanotes/service/QuestionListItemService.java b/src/main/java/com/example/copykamanotes/service/QuestionListItemService.java
new file mode 100644
index 0000000..adbeaa6
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/QuestionListItemService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface QuestionListItemService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/QuestionListService.java b/src/main/java/com/example/copykamanotes/service/QuestionListService.java
new file mode 100644
index 0000000..35a7caa
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/QuestionListService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface QuestionListService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/QuestionService.java b/src/main/java/com/example/copykamanotes/service/QuestionService.java
new file mode 100644
index 0000000..02ea561
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/QuestionService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface QuestionService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/RedisService.java b/src/main/java/com/example/copykamanotes/service/RedisService.java
new file mode 100644
index 0000000..1974c1c
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/RedisService.java
@@ -0,0 +1,19 @@
+package com.example.copykamanotes.service;
+
+public interface RedisService {
+    void set(String key, Object value);
+
+    void setWithExpire(String key, Object value, long expire);
+
+    Object get(String key);
+
+    void delete(String key);
+
+    boolean exists(String key);
+
+    Long increment(String key, long delta);
+
+    Object getHashValue(String hashKey, String key);
+
+    void setHashValue(String hashKey, String key, Object value);
+}
diff --git a/src/main/java/com/example/copykamanotes/service/SearchService.java b/src/main/java/com/example/copykamanotes/service/SearchService.java
new file mode 100644
index 0000000..be21448
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/SearchService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface SearchService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/StatisticService.java b/src/main/java/com/example/copykamanotes/service/StatisticService.java
new file mode 100644
index 0000000..0fb1392
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/StatisticService.java
@@ -0,0 +1,4 @@
+package com.example.copykamanotes.service;
+
+public interface StatisticService {
+}
diff --git a/src/main/java/com/example/copykamanotes/service/UploadService.java b/src/main/java/com/example/copykamanotes/service/UploadService.java
new file mode 100644
index 0000000..43ab552
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/UploadService.java
@@ -0,0 +1,9 @@
+package com.example.copykamanotes.service;
+
+import com.example.copykamanotes.model.base.ApiResponse;
+import com.example.copykamanotes.model.vo.upload.ImageVO;
+import org.springframework.web.multipart.MultipartFile;
+
+public interface UploadService {
+    ApiResponse<ImageVO> uploadImage(MultipartFile file);
+}
diff --git a/src/main/java/com/example/copykamanotes/service/impl/NoteServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/NoteServiceImpl.java
new file mode 100644
index 0000000..038033d
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/impl/NoteServiceImpl.java
@@ -0,0 +1,55 @@
+package com.example.copykamanotes.service.impl;
+
+import com.example.copykamanotes.model.base.ApiResponse;
+import com.example.copykamanotes.model.base.EmptyVO;
+import com.example.copykamanotes.model.dto.note.*;
+import com.example.copykamanotes.model.vo.note.CreateNoteVO;
+import com.example.copykamanotes.model.vo.note.DownloadNoteVO;
+import com.example.copykamanotes.model.vo.note.NoteVO;
+import com.example.copykamanotes.service.NoteService;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class NoteServiceImpl implements NoteService {
+    @Override
+    public ApiResponse<List<NoteVO>> getNotes(NoteQueryParams noteQueryParams) {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<CreateNoteVO> createNote(CreateNoteRequest createNoteRequest) {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<EmptyVO> updateNote(Integer noteId, UpdateNoteRequest updateNoteRequest) {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<EmptyVO> deleteNote(Integer noteId) {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<DownloadNoteVO> downloadNote(Integer noteId) {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<List<NoteRankListItem>> submitNoteRank() {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<List<NoteHeatMapItem>> submitNoteHeatMap() {
+        return null;
+    }
+
+    @Override
+    public ApiResponse<Top3Count> submitNoteTop3Count() {
+        return null;
+    }
+}
diff --git a/src/main/java/com/example/copykamanotes/service/impl/RedisServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/RedisServiceImpl.java
new file mode 100644
index 0000000..73ecfd7
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/impl/RedisServiceImpl.java
@@ -0,0 +1,53 @@
+package com.example.copykamanotes.service.impl;
+
+import com.example.copykamanotes.service.RedisService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.stereotype.Service;
+
+@Service
+public class RedisServiceImpl implements RedisService {
+    @Autowired
+    private RedisTemplate<String, Object> redisTemplate;
+
+    @Override
+    public void set(String key, Object value) {
+        redisTemplate.opsForValue().set(key, value);
+    }
+
+    @Override
+    public void setWithExpire(String key, Object value, long expire) {
+        redisTemplate.opsForValue().set(key, value, expire);
+    }
+
+    @Override
+    public Object get(String key) {
+        return redisTemplate.opsForValue().get(key);
+    }
+
+    @Override
+    public void delete(String key) {
+        redisTemplate.delete(key);
+    }
+
+    @Override
+    public boolean exists(String key) {
+        return Boolean.TRUE.equals(redisTemplate.hasKey(key));
+    }
+
+    @Override
+    public Long increment(String key, long delta) {
+        return redisTemplate.opsForValue().increment(key, delta);
+    }
+
+    @Override
+    public Object getHashValue(String hashKey, String key) {
+        return redisTemplate.opsForHash().get(hashKey, key);
+    }
+
+    @Override
+    public void setHashValue(String hashKey, String key, Object value) {
+        redisTemplate.opsForHash().put(hashKey, key, value);
+    }
+}
diff --git a/src/main/java/com/example/copykamanotes/service/impl/UploadServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/UploadServiceImpl.java
new file mode 100644
index 0000000..95d927a
--- /dev/null
+++ b/src/main/java/com/example/copykamanotes/service/impl/UploadServiceImpl.java
@@ -0,0 +1,25 @@
+package com.example.copykamanotes.service.impl;
+
+import com.example.copykamanotes.model.base.ApiResponse;
+import com.example.copykamanotes.model.vo.upload.ImageVO;
+import com.example.copykamanotes.service.FileService;
+import com.example.copykamanotes.service.UploadService;
+import com.example.copykamanotes.utils.ApiResponseUtil;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class UploadServiceImpl implements UploadService {
+
+    @Autowired
+    private FileService fileService;
+
+    @Override
+    public ApiResponse<ImageVO> uploadImage(MultipartFile file) {
+        String url = fileService.uploadImage(file);
+        ImageVO imageVO = new ImageVO();
+        imageVO.setUrl(url);
+        return ApiResponseUtil.success("上传成功", imageVO);
+    }
+}