diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/common/advice/GlobalExceptionHandler.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/advice/GlobalExceptionHandler.java
new file mode 100644
index 0000000..54a99b0
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/advice/GlobalExceptionHandler.java
@@ -0,0 +1,71 @@
+package com.test.bijihoudaun.common.advice;
+
+import com.test.bijihoudaun.common.exception.BaseException;
+
+import com.test.bijihoudaun.common.response.R;
+import com.test.bijihoudaun.common.response.ResultCode;
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.validation.BindException;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.multipart.MaxUploadSizeExceededException;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 全局异常处理器
+ */
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    /**
+     * 处理业务异常
+     */
+    @ExceptionHandler(BaseException.class)
+    public R<Void> handleBaseException(BaseException e, HttpServletRequest request) {
+        return R.fail(e.getResultCode().getCode(), e.getMessage());
+    }
+
+    /**
+     * 处理文件大小超出限制异常
+     */
+    @ExceptionHandler(MaxUploadSizeExceededException.class)
+    public R<String> handleFileSizeLimitExceeded() {
+        return R.fail("文件大小超过限制");
+    }
+
+    /**
+     * 处理参数校验异常
+     */
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public R<List<String>> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
+        List<String> errors = e.getBindingResult().getFieldErrors()
+                .stream()
+                .map(FieldError::getDefaultMessage)
+                .collect(Collectors.toList());
+        return R.fail(ResultCode.VALIDATE_FAILED.getCode(), errors.get(0));
+    }
+
+    /**
+     * 处理绑定异常
+     */
+    @ExceptionHandler(BindException.class)
+    public R<List<String>> handleBindException(BindException e) {
+        List<String> errors = e.getBindingResult().getFieldErrors()
+                .stream()
+                .map(FieldError::getDefaultMessage)
+                .collect(Collectors.toList());
+        return R.fail(ResultCode.VALIDATE_FAILED.getCode(), errors.get(0));
+    }
+
+    /**
+     * 处理其他异常
+     */
+    @ExceptionHandler(Exception.class)
+    public R<Void> handleException(Exception e) {
+        return R.fail(ResultCode.FAILED.getCode(), "系统繁忙，请稍后再试");
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/common/exception/BaseException.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/exception/BaseException.java
new file mode 100644
index 0000000..44d05c9
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/exception/BaseException.java
@@ -0,0 +1,32 @@
+package com.test.bijihoudaun.common.exception;
+
+import com.test.bijihoudaun.common.response.ResultCode;
+import lombok.Getter;
+
+/**
+ * 基础业务异常类
+ */
+@Getter
+public class BaseException extends RuntimeException {
+    private final ResultCode resultCode;
+
+    public BaseException(ResultCode resultCode) {
+        super(resultCode.getMsg());
+        this.resultCode = resultCode;
+    }
+
+    public BaseException(ResultCode resultCode, String message) {
+        super(message);
+        this.resultCode = resultCode;
+    }
+
+    public BaseException(ResultCode resultCode, Throwable cause) {
+        super(resultCode.getMsg(), cause);
+        this.resultCode = resultCode;
+    }
+
+    public BaseException(ResultCode resultCode, String message, Throwable cause) {
+        super(message, cause);
+        this.resultCode = resultCode;
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/R.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/R.java
new file mode 100644
index 0000000..41a1b4d
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/R.java
@@ -0,0 +1,87 @@
+package com.test.bijihoudaun.common.response;
+
+import lombok.Data;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ProblemDetail;
+
+import java.io.Serializable;
+import java.net.URI;
+
+/**
+ * 统一返回结果类
+ * @param <T> 数据类型
+ */
+@Data
+public class R<T> implements Serializable {
+    private static final long serialVersionUID = 1L;
+
+    private Integer code; // 状态码
+    private String msg;  // 消息
+    private T data;      // 数据
+
+    // 成功返回
+    public static <T> R<T> success() {
+        return success(null);
+    }
+
+    public static <T> R<T> success(T data) {
+        R<T> r = new R<>();
+        r.setCode(ResultCode.SUCCESS.getCode());
+        r.setMsg(ResultCode.SUCCESS.getMsg());
+        r.setData(data);
+        return r;
+    }
+
+    // 分页成功返回
+    public static <T> R<T> pageSuccess(long total, T data) {
+        PageR<T> r = new PageR<>();
+        r.setCode(ResultCode.SUCCESS.getCode());
+        r.setMsg(ResultCode.SUCCESS.getMsg());
+        r.setData(data);
+        r.setTotal(total);
+        return r;
+    }
+
+    // 失败返回
+    public static <T> R<T> fail() {
+        return fail(ResultCode.FAILED);
+    }
+
+    public static <T> R<T> fail(ResultCode resultCode) {
+        return fail(resultCode.getCode(), resultCode.getMsg());
+    }
+
+    public static <T> R<T> fail(String msg) {
+        return fail(ResultCode.FAILED.getCode(), msg);
+    }
+
+    public static <T> R<T> fail(Integer code, String msg) {
+        R<T> r = new R<>();
+        r.setCode(code);
+        r.setMsg(msg);
+        return r;
+    }
+
+    // 转换为ProblemDetail
+    public static ProblemDetail toProblemDetail(ResultCode resultCode, HttpStatus status) {
+        ProblemDetail problemDetail = ProblemDetail.forStatus(status);
+        problemDetail.setType(URI.create("https://api.test.com/errors/" + resultCode.name().toLowerCase()));
+        problemDetail.setTitle(resultCode.getMsg());
+        problemDetail.setDetail(resultCode.getMsg());
+        problemDetail.setProperty("code", resultCode.getCode());
+        return problemDetail;
+    }
+
+    // 分页返回结果类
+    private static class PageR<T> extends R<T> {
+        private long total;
+
+        public long getTotal() {
+            return total;
+        }
+
+        public void setTotal(long total) {
+            this.total = total;
+        }
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/ResultCode.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/ResultCode.java
new file mode 100644
index 0000000..661d198
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/common/response/ResultCode.java
@@ -0,0 +1,51 @@
+package com.test.bijihoudaun.common.response;
+
+import lombok.Getter;
+
+/**
+ * 返回状态码枚举
+ */
+@Getter
+public enum ResultCode {
+    // 基础状态码
+    SUCCESS(200, "操作成功"),
+    FAILED(500, "操作失败"),
+    VALIDATE_FAILED(400, "参数校验失败"),
+    UNAUTHORIZED(401, "未授权"),
+    FORBIDDEN(403, "禁止访问"),
+    NOT_FOUND(404, "资源不存在"),
+    
+    // 参数相关错误
+    PARAM_IS_INVALID(1001, "参数无效"),
+    PARAM_IS_BLANK(1002, "参数为空"),
+    PARAM_TYPE_BIND_ERROR(1003, "参数类型错误"),
+    PARAM_NOT_COMPLETE(1004, "参数缺失"),
+    
+    // 加密相关错误
+    ENCRYPTION_FAILED(2001, "加密失败"),
+    DECRYPTION_FAILED(2002, "解密失败"),
+    KEY_GENERATION_FAILED(2003, "密钥生成失败"),
+    INVALID_KEY_FORMAT(2004, "密钥格式无效"),
+
+    // 编码相关
+    BASE64_ENCODE_FAILED(4001, "Base64编码失败"),
+    BASE64_DECODE_FAILED(4002, "Base64解码失败"),
+
+
+
+    // ID生成相关
+    ID_GENERATION_FAILED(3001, "ID生成失败"),
+    UUID_GENERATION_FAILED(3002, "UUID生成失败"),
+    SNOWFLAKE_PARAM_INVALID(3003, "雪花ID参数无效"),  // 用于workerId/datacenterId越界
+    CLOCK_BACKWARD_ERROR(3004, "系统时钟回拨异常"),   // 处理时钟回拨场景
+    SEQUENCE_OVERFLOW(3005, "ID序列号溢出");        // 序列号超过4095时的异常
+
+
+    private final Integer code;
+    private final String msg;
+
+    ResultCode(Integer code, String msg) {
+        this.code = code;
+        this.msg = msg;
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/config/WebConfig.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/config/WebConfig.java
new file mode 100644
index 0000000..c1d4018
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/config/WebConfig.java
@@ -0,0 +1,26 @@
+package com.test.bijihoudaun.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/**")
+                .allowedOrigins("*")
+                .allowedMethods("*")
+                .allowedHeaders("*")
+                .maxAge(3600); // 预检请求缓存时间
+        ;
+    }
+
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        registry.addResourceHandler("/uploads/**")
+                .addResourceLocations("file:uploads/");
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/ImageController.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/ImageController.java
new file mode 100644
index 0000000..96145ec
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/ImageController.java
@@ -0,0 +1,33 @@
+package com.test.bijihoudaun.controller;
+
+
+import com.test.bijihoudaun.entity.Image;
+import com.test.bijihoudaun.service.ImageService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+
+@RestController
+@RequestMapping("/api/images")
+public class ImageController {
+
+    @Autowired
+    private ImageService imageService;
+
+    @PostMapping
+    public ResponseEntity<Image> uploadImage(
+            @RequestParam Integer userId,
+            @RequestParam(required = false) Integer markdownId,
+            @RequestParam("file") MultipartFile file) {
+
+        try {
+            Image image = imageService.uploadImage(userId, markdownId, file);
+            return ResponseEntity.ok(image);
+        } catch (IOException e) {
+            return ResponseEntity.status(500).build();
+        }
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/MarkdownController.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/MarkdownController.java
new file mode 100644
index 0000000..9e9d978
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/controller/MarkdownController.java
@@ -0,0 +1,41 @@
+package com.test.bijihoudaun.controller;
+
+import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.service.MarkdownFileService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/markdown")
+public class MarkdownController {
+
+    @Autowired
+    private MarkdownFileService markdownFileService;
+
+    @PostMapping
+    public ResponseEntity<MarkdownFile> createMarkdown(
+            @RequestParam Integer userId,
+            @RequestParam String title,
+            @RequestParam String fileName,
+            @RequestBody String content) {
+
+        MarkdownFile file = markdownFileService.createMarkdownFile(
+                userId, title, fileName, content);
+
+        return ResponseEntity.ok(file);
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<MarkdownFile> updateMarkdown(
+            @PathVariable Integer id,
+            @RequestBody String content) {
+
+        MarkdownFile file = markdownFileService.updateMarkdownContent(id, content);
+
+        if (file != null) {
+            return ResponseEntity.ok(file);
+        }
+        return ResponseEntity.notFound().build();
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/Image.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/Image.java
new file mode 100644
index 0000000..e1be22e
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/Image.java
@@ -0,0 +1,32 @@
+package com.test.bijihoudaun.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+@Data
+@TableName("image")
+public class Image {
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+    private Integer userId;
+    private Integer markdownId;
+
+    @TableField("original_name")
+    private String originalName;
+
+    @TableField("stored_name")
+    private String storedName;
+
+    private String url;
+    private Integer size;
+
+    @TableField("content_type")
+    private String contentType;
+
+    private LocalDateTime createdAt;
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/MarkdownFile.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/MarkdownFile.java
new file mode 100644
index 0000000..e50aad5
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/MarkdownFile.java
@@ -0,0 +1,25 @@
+package com.test.bijihoudaun.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+@Data
+@TableName("markdown_file")
+public class MarkdownFile {
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+    private Integer userId;
+    private String title;
+
+    @TableField("file_name")
+    private String fileName;
+
+    private String content;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/User.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/User.java
new file mode 100644
index 0000000..b96a0ba
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/entity/User.java
@@ -0,0 +1,20 @@
+package com.test.bijihoudaun.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+@Data
+@TableName("user")
+public class User {
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+    private String username;
+    private String password;
+    private String email;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/interceptor/XSSInterceptor.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/interceptor/XSSInterceptor.java
new file mode 100644
index 0000000..6f089eb
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/interceptor/XSSInterceptor.java
@@ -0,0 +1,26 @@
+package com.test.bijihoudaun.interceptor;
+
+import cn.hutool.core.util.StrUtil;
+import cn.hutool.http.HtmlUtil;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.web.servlet.HandlerInterceptor;
+
+import java.util.Arrays;
+import java.util.Map;
+
+public class XSSInterceptor implements HandlerInterceptor {
+
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+        // 清理请求参数中的XSS内容
+        Map<String, String[]> parameterMap = request.getParameterMap();
+        parameterMap.forEach((key, values) -> {
+            String[] newValues = Arrays.stream(values)
+                    .map(v -> StrUtil.isBlank(v) ? v : HtmlUtil.filter(v))
+                    .toArray(String[]::new);
+            request.setAttribute("filtered_" + key, newValues);
+        });
+        return true;
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/ImageMapper.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/ImageMapper.java
new file mode 100644
index 0000000..6a91a43
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/ImageMapper.java
@@ -0,0 +1,14 @@
+package com.test.bijihoudaun.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.test.bijihoudaun.entity.Image;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface ImageMapper extends BaseMapper<Image> {
+    // 自定义方法：根据用户ID获取图片列表
+    // List<Image> findByUserId(Integer userId);
+
+    // 自定义方法：根据Markdown文件ID获取关联图片
+    // List<Image> findByMarkdownId(Integer markdownId);
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/MarkdownFileMapper.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/MarkdownFileMapper.java
new file mode 100644
index 0000000..d9c1901
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/MarkdownFileMapper.java
@@ -0,0 +1,11 @@
+package com.test.bijihoudaun.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.test.bijihoudaun.entity.MarkdownFile;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface MarkdownFileMapper extends BaseMapper<MarkdownFile> {
+    // 自定义方法：根据用户ID获取文件列表
+    // List<MarkdownFile> findByUserId(Integer userId);
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/UserMapper.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/UserMapper.java
new file mode 100644
index 0000000..0415a3c
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/UserMapper.java
@@ -0,0 +1,12 @@
+package com.test.bijihoudaun.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.test.bijihoudaun.entity.User;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface UserMapper extends BaseMapper<User> {
+    // 自定义查询方法示例
+    // @Select("SELECT * FROM user WHERE username = #{username}")
+    // User findByUsername(String username);
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/ImageService.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/ImageService.java
new file mode 100644
index 0000000..3d51bd6
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/ImageService.java
@@ -0,0 +1,42 @@
+package com.test.bijihoudaun.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.test.bijihoudaun.entity.Image;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.util.List;
+
+public interface ImageService extends IService<Image> {
+    /**
+     * 上传图片
+     * @param userId 用户ID
+     * @param markdownId Markdown文件ID（可选）
+     * @param file 图片文件
+     * @return 上传的图片对象
+     * @throws IOException 文件操作异常
+     */
+    Image uploadImage(Integer userId, Integer markdownId, MultipartFile file) throws IOException;
+
+    /**
+     * 删除图片
+     * @param id 图片ID
+     * @param userId 用户ID（用于权限验证）
+     * @return 是否删除成功
+     */
+    boolean deleteImage(Integer id, Integer userId);
+
+    /**
+     * 获取用户的图片列表
+     * @param userId 用户ID
+     * @return 图片列表
+     */
+    List<Image> getUserImages(Integer userId);
+
+    /**
+     * 获取Markdown文件关联的图片
+     * @param markdownId Markdown文件ID
+     * @return 图片列表
+     */
+    List<Image> getMarkdownImages(Integer markdownId);
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/MarkdownFileService.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/MarkdownFileService.java
new file mode 100644
index 0000000..2ab8aca
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/MarkdownFileService.java
@@ -0,0 +1,33 @@
+package com.test.bijihoudaun.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.test.bijihoudaun.entity.MarkdownFile;
+
+import java.util.List;
+
+public interface MarkdownFileService extends IService<MarkdownFile> {
+    /**
+     * 创建Markdown文件
+     * @param userId 用户ID
+     * @param title 文件标题
+     * @param fileName 文件名
+     * @param content 文件内容
+     * @return 创建的文件对象
+     */
+    MarkdownFile createMarkdownFile(Integer userId, String title, String fileName, String content);
+
+    /**
+     * 更新Markdown内容
+     * @param id 文件ID
+     * @param content 新内容
+     * @return 更新后的文件对象
+     */
+    MarkdownFile updateMarkdownContent(Integer id, String content);
+
+    /**
+     * 获取用户的所有Markdown文件
+     * @param userId 用户ID
+     * @return 文件列表
+     */
+    List<MarkdownFile> getUserFiles(Integer userId);
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/UserService.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/UserService.java
new file mode 100644
index 0000000..d475f47
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/UserService.java
@@ -0,0 +1,29 @@
+package com.test.bijihoudaun.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.test.bijihoudaun.entity.User;
+
+public interface UserService extends IService<User> {
+    /**
+     * 用户注册
+     * @param username 用户名
+     * @param password 密码
+     * @param email 邮箱
+     * @return 注册成功的用户
+     */
+    User register(String username, String password, String email);
+
+    /**
+     * 用户登录
+     * @param username 用户名
+     * @param password 密码
+     * @return 登录成功的用户
+     */
+    User login(String username, String password);
+
+    /**
+     * 用户删除
+     * @param id 用户id
+     */
+    void deleteUser(Integer id);
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/ImageServiceImpl.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/ImageServiceImpl.java
new file mode 100644
index 0000000..033ebe9
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/ImageServiceImpl.java
@@ -0,0 +1,100 @@
+package com.test.bijihoudaun.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.test.bijihoudaun.entity.Image;
+import com.test.bijihoudaun.mapper.ImageMapper;
+import com.test.bijihoudaun.service.ImageService;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.UUID;
+
+@Service
+public class ImageServiceImpl
+        extends ServiceImpl<ImageMapper, Image>
+        implements ImageService {
+
+    @Value("${file.upload-dir}")
+    private String uploadDir;
+
+    @Override
+    public Image uploadImage(Integer userId, Integer markdownId, MultipartFile file) throws IOException {
+        // 创建上传目录
+        Path uploadPath = Paths.get(uploadDir);
+        if (!Files.exists(uploadPath)) {
+            Files.createDirectories(uploadPath);
+        }
+
+        // 生成唯一文件名
+        String originalFilename = file.getOriginalFilename();
+        String extension = originalFilename.substring(originalFilename.lastIndexOf("."));
+        String storedName = UUID.randomUUID() + extension;
+
+        // 保存文件
+        Path filePath = uploadPath.resolve(storedName);
+        Files.copy(file.getInputStream(), filePath);
+
+        // 创建图片实体
+        Image image = new Image();
+        image.setUserId(userId);
+        image.setMarkdownId(markdownId);
+        image.setOriginalName(originalFilename);
+        image.setStoredName(storedName);
+        image.setUrl("/uploads/" + storedName);
+        image.setSize((int) file.getSize());
+        image.setContentType(file.getContentType());
+        image.setCreatedAt(LocalDateTime.now());
+
+        this.save(image);
+        return image;
+    }
+
+    @Override
+    public boolean deleteImage(Integer id, Integer userId) {
+        QueryWrapper<Image> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("id", id)
+                .eq("user_id", userId);
+
+        Image image = this.getOne(queryWrapper);
+        if (image == null) {
+            return false;
+        }
+
+        try {
+            // 删除文件系统中的图片
+            Path filePath = Paths.get(uploadDir, image.getStoredName());
+            Files.deleteIfExists(filePath);
+
+            // 删除数据库记录
+            this.removeById(id);
+            return true;
+        } catch (IOException e) {
+            throw new RuntimeException("删除图片失败", e);
+        }
+    }
+
+    @Override
+    public List<Image> getUserImages(Integer userId) {
+        QueryWrapper<Image> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("user_id", userId)
+                .orderByDesc("created_at");
+        return this.list(queryWrapper);
+    }
+
+    @Override
+    public List<Image> getMarkdownImages(Integer markdownId) {
+        QueryWrapper<Image> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("markdown_id", markdownId)
+                .orderByDesc("created_at");
+        return this.list(queryWrapper);
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/MarkdownFileServiceImpl.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/MarkdownFileServiceImpl.java
new file mode 100644
index 0000000..31d5610
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/MarkdownFileServiceImpl.java
@@ -0,0 +1,51 @@
+package com.test.bijihoudaun.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.mapper.MarkdownFileMapper;
+import com.test.bijihoudaun.service.MarkdownFileService;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Service
+public class MarkdownFileServiceImpl
+        extends ServiceImpl<MarkdownFileMapper, MarkdownFile>
+        implements MarkdownFileService {
+
+    @Override
+    public MarkdownFile createMarkdownFile(Integer userId, String title, String fileName, String content) {
+        MarkdownFile file = new MarkdownFile();
+        file.setUserId(userId);
+        file.setTitle(title);
+        file.setFileName(fileName);
+        file.setContent(content);
+        file.setCreatedAt(LocalDateTime.now());
+        file.setUpdatedAt(LocalDateTime.now());
+
+        this.save(file);
+        return file;
+    }
+
+    @Override
+    public MarkdownFile updateMarkdownContent(Integer id, String content) {
+        MarkdownFile file = this.getById(id);
+        if (file != null) {
+            file.setContent(content);
+            file.setUpdatedAt(LocalDateTime.now());
+            this.updateById(file);
+        }
+        return file;
+    }
+
+    @Override
+    public List<MarkdownFile> getUserFiles(Integer userId) {
+        QueryWrapper<MarkdownFile> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("user_id", userId)
+                .orderByDesc("updated_at");
+        return this.list(queryWrapper);
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/UserServiceImpl.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/UserServiceImpl.java
new file mode 100644
index 0000000..96fa5f7
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/UserServiceImpl.java
@@ -0,0 +1,54 @@
+package com.test.bijihoudaun.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.test.bijihoudaun.entity.User;
+import com.test.bijihoudaun.mapper.UserMapper;
+import com.test.bijihoudaun.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+
+@Service
+public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
+
+    @Autowired
+    private UserMapper userMapper;
+
+    @Override
+    public User register(String username, String password, String email) {
+        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.eq(User::getUsername, username);
+        if (this.count(queryWrapper) > 0) {
+            return null;
+        }
+        queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.eq(User::getEmail, email);
+        if (this.count(queryWrapper) > 0) {
+            return null;
+        }
+        User user = new User();
+        user.setUsername(username);
+        user.setPassword(password);
+        user.setEmail(email);
+        user.setCreatedAt(LocalDateTime.now());
+        userMapper.insert(user);
+        return user;
+    }
+
+    @Override
+    public User login(String username, String password) {
+        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.eq(User::getUsername, username)
+                .eq(User::getPassword, password);
+        return userMapper.selectOne(queryWrapper);
+    }
+
+    @Override
+    public void deleteUser(Integer id) {
+        userMapper.deleteById(id);
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/EntityCopier.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/EntityCopier.java
new file mode 100644
index 0000000..0572319
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/EntityCopier.java
@@ -0,0 +1,49 @@
+package com.test.bijihoudaun.util;
+
+import cn.hutool.core.bean.BeanUtil;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 实体复制工具类
+ */
+public class EntityCopier {
+
+    /**
+     * 复制实体属性到另一个实体
+     * @param source 源实体
+     * @param target 目标实体
+     * @param <S> 源类型
+     * @param <T> 目标类型
+     */
+    public static <S, T> void copyEntityToEntity(S source, T target) {
+        BeanUtil.copyProperties(source, target);
+    }
+
+    /**
+     * 复制实体属性到目标类的新实例
+     * @param source 源实体
+     * @param targetClass 目标类
+     * @param <S> 源类型
+     * @param <T> 目标类型
+     * @return 目标类的新实例
+     */
+    public static <S, T> T copyEntityToClass(S source, Class<T> targetClass) {
+        return BeanUtil.copyProperties(source, targetClass);
+    }
+
+    /**
+     * 复制实体列表到目标类列表
+     * @param sourceList 源列表
+     * @param targetClass 目标类
+     * @param <S> 源类型
+     * @param <T> 目标类型
+     * @return 目标类的新列表
+     */
+    public static <S, T> List<T> copyList(List<S> sourceList, Class<T> targetClass) {
+        return sourceList.stream()
+                .map(source -> copyEntityToClass(source, targetClass))
+                .collect(Collectors.toList());
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/RandomString.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/RandomString.java
new file mode 100644
index 0000000..a576631
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/RandomString.java
@@ -0,0 +1,16 @@
+package com.test.bijihoudaun.util;
+
+public class RandomString {
+
+    // 生成指定长度的随机字符串
+    public static String generateRandomString(int length) {
+        String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+        StringBuilder result = new StringBuilder();
+
+        for (int i = 0; i < length; i++) {
+            int randomIndex = (int) (Math.random() * chars.length());
+            result.append(chars.charAt(randomIndex));
+        }
+        return result.toString();
+    }
+}
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/SnowflakeIdGenerator.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/SnowflakeIdGenerator.java
new file mode 100644
index 0000000..ad78d04
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/SnowflakeIdGenerator.java
@@ -0,0 +1,122 @@
+package com.test.bijihoudaun.util;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SnowflakeIdGenerator {
+
+    // 起始时间戳（2023-01-01 00:00:00）
+    private static final long EPOCH = 1672531200000L;
+
+    // 机器ID位数
+    private static final long WORKER_ID_BITS = 5L;
+    // 数据中心ID位数
+    private static final long DATACENTER_ID_BITS = 5L;
+    // 最大机器ID (0-31)
+    private static final long MAX_WORKER_ID = ~(-1L << WORKER_ID_BITS);
+    // 最大数据中心ID (0-31)
+    private static final long MAX_DATACENTER_ID = ~(-1L << DATACENTER_ID_BITS);
+    // 序列号位数
+    private static final long SEQUENCE_BITS = 12L;
+
+    // 机器ID左移位数
+    private static final long WORKER_ID_SHIFT = SEQUENCE_BITS;
+    // 数据中心ID左移位数
+    private static final long DATACENTER_ID_SHIFT = SEQUENCE_BITS + WORKER_ID_BITS;
+    // 时间戳左移位数
+    private static final long TIMESTAMP_SHIFT = SEQUENCE_BITS + WORKER_ID_BITS + DATACENTER_ID_BITS;
+    // 序列号掩码（4095）
+    private static final long SEQUENCE_MASK = ~(-1L << SEQUENCE_BITS);
+
+    private final long workerId;
+    private final long datacenterId;
+
+    private long sequence = 0L;
+    private long lastTimestamp = -1L;
+
+    /**
+     * 构造函数
+     *
+     * @param workerId     机器ID
+     * @param datacenterId 数据中心ID
+     */
+    public SnowflakeIdGenerator(
+            @Value("${worker.id:0}") long workerId,
+            @Value("${datacenter.id:0}") long datacenterId) {
+
+        // 校验机器ID范围
+        if (workerId > MAX_WORKER_ID || workerId < 0) {
+            throw new IllegalArgumentException(
+                    String.format("Worker ID 必须在 0 到 %d 之间", MAX_WORKER_ID));
+        }
+
+        // 校验数据中心ID范围
+        if (datacenterId > MAX_DATACENTER_ID || datacenterId < 0) {
+            throw new IllegalArgumentException(
+                    String.format("Datacenter ID 必须在 0 到 %d 之间", MAX_DATACENTER_ID));
+        }
+
+        this.workerId = workerId;
+        this.datacenterId = datacenterId;
+    }
+
+    /**
+     * 生成雪花ID
+     *
+     * @return 雪花ID
+     */
+    public synchronized long nextId() {
+        long timestamp = currentTime();
+
+        // 处理时钟回拨
+        if (timestamp < lastTimestamp) {
+            throw new RuntimeException(
+                    String.format("时钟回拨拒绝生成ID。当前时间: %d, 最后时间: %d",
+                            timestamp, lastTimestamp));
+        }
+
+        // 同一毫秒内生成ID
+        if (lastTimestamp == timestamp) {
+            sequence = (sequence + 1) & SEQUENCE_MASK;
+            // 当前毫秒序列号用完
+            if (sequence == 0) {
+                timestamp = nextMillis(lastTimestamp);
+            }
+        }
+        // 新毫秒重置序列号
+        else {
+            sequence = 0L;
+        }
+
+        lastTimestamp = timestamp;
+
+        // 组合ID各部分
+        return ((timestamp - EPOCH) << TIMESTAMP_SHIFT)
+                | (datacenterId << DATACENTER_ID_SHIFT)
+                | (workerId << WORKER_ID_SHIFT)
+                | sequence;
+    }
+
+    /**
+     * 生成雪花ID，转化成字符串类型
+     *
+     * @return 雪花ID-字符串类型
+     */
+    public synchronized String nextIdStr() {
+        return Long.toString(nextId());
+    }
+
+    // 等待下一毫秒
+    private long nextMillis(long lastTimestamp) {
+        long timestamp = currentTime();
+        while (timestamp <= lastTimestamp) {
+            timestamp = currentTime();
+        }
+        return timestamp;
+    }
+
+    // 获取当前毫秒时间戳
+    private long currentTime() {
+        return System.currentTimeMillis();
+    }
+}
\ No newline at end of file
diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/UuidV7.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/UuidV7.java
new file mode 100644
index 0000000..bdf6bbe
--- /dev/null
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/UuidV7.java
@@ -0,0 +1,26 @@
+package com.test.bijihoudaun.util;
+
+import com.fasterxml.uuid.Generators;
+import com.fasterxml.uuid.impl.TimeBasedGenerator;
+
+/**
+ * uuidV7
+ */
+public class UuidV7 {
+    /**
+     * 生成uuidV7，生成的uuid有-
+     */
+    public static String uuid() {
+        TimeBasedGenerator generator = Generators.timeBasedGenerator();
+        return generator.generate().toString();
+    }
+
+    /**
+     * 获取uuidV7，生成的uuid无-
+     */
+    public static String uuidNoHyphen() {
+        return uuid().replace("-", "");
+    }
+
+
+}
diff --git a/biji-houdaun/src/main/resources/application.yml b/biji-houdaun/src/main/resources/application.yml
index b64c2fb..4aff118 100644
--- a/biji-houdaun/src/main/resources/application.yml
+++ b/biji-houdaun/src/main/resources/application.yml
@@ -7,6 +7,10 @@ spring:
     multipart:
       max-file-size: 10MB       # ???????5MB
       max-request-size: 10MB   # ???????5MB
+file:
+  upload-dir: uploads
+
+
 #??
 server:
   port: 8083
@@ -19,3 +23,9 @@ worker:
   # ????ID (0~31)
 datacenter:
   id: 1
+
+# MyBatis-Plus??
+mybatis-plus:
+  mapper-locations: classpath:mapper/*.xml
+  configuration:
+    map-underscore-to-camel-case: true
diff --git a/mydatabase.db b/mydatabase.db
index e69de29..9e1c3e8 100644
Binary files a/mydatabase.db and b/mydatabase.db differ
diff --git a/sql/data.sql b/sql/data.sql
new file mode 100644
index 0000000..2a0d708
--- /dev/null
+++ b/sql/data.sql
@@ -0,0 +1,36 @@
+-- 用户表
+CREATE TABLE IF NOT EXISTS user (
+                                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                                    username TEXT NOT NULL UNIQUE,
+                                    password TEXT NOT NULL,
+                                    email TEXT,
+                                    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                                    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Markdown文件表
+CREATE TABLE IF NOT EXISTS markdown_file (
+                                             id INTEGER PRIMARY KEY AUTOINCREMENT,
+                                             user_id INTEGER NOT NULL,
+                                             title TEXT NOT NULL,
+                                             file_name TEXT NOT NULL,
+                                             content TEXT NOT NULL,
+                                             created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                                             updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                                             FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE CASCADE
+    );
+
+-- 图片表
+CREATE TABLE IF NOT EXISTS image (
+                                     id INTEGER PRIMARY KEY AUTOINCREMENT,
+                                     user_id INTEGER NOT NULL,
+                                     markdown_id INTEGER,
+                                     original_name TEXT NOT NULL,
+                                     stored_name TEXT NOT NULL UNIQUE,
+                                     url TEXT NOT NULL,
+                                     size INTEGER NOT NULL,
+                                     content_type TEXT NOT NULL,
+                                     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                                     FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE CASCADE,
+    FOREIGN KEY (markdown_id) REFERENCES markdown_file(id) ON DELETE SET NULL
+    );
\ No newline at end of file