开发一个上传文件接口，将上传的文件保存到服务器中，并将文件信息：如文件名、文件类型、文件大小保存到数据库

src/main/java/com/aiassistant/controller/FileController.java

@@ -0,0 +1,55 @@
+package com.aiassistant.controller;
+
+import com.aiassistant.service.FileService;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+@RestController
+public class FileController {
+    private final FileService fileService;
+
+    @Autowired
+    public FileController(FileService fileService) {
+        this.fileService = fileService;
+    }
+
+    @PostMapping("/upload")
+    public ResultModel uploadFile(@RequestParam("file") MultipartFile file) {
+        String fileName = file.getOriginalFilename();
+        String fileType = file.getContentType();
+        long fileSize = file.getSize();
+
+        // Call the fileService to handle file upload and save
+        fileService.uploadAndSaveFile(file);
+
+        return ResultModel.ofSuccess("File uploaded successfully", new FileUploadInfo(fileName, fileType, fileSize));
+    }
+
+    private static class FileUploadInfo {
+        private final String fileName;
+        private final String fileType;
+        private final long fileSize;
+
+        public FileUploadInfo(String fileName, String fileType, long fileSize) {
+            this.fileName = fileName;
+            this.fileType = fileType;
+            this.fileSize = fileSize;
+        }
+
+        public String getFileName() {
+            return fileName;
+        }
+
+        public String getFileType() {
+            return fileType;
+        }
+
+        public long getFileSize() {
+            return fileSize;
+        }
+    }
+}

src/main/java/com/aiassistant/mapper/FileMapper.java

@@ -0,0 +1,11 @@
+package com.aiassistant.mapper;
+
+import com.aiassistant.model.File;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface FileMapper {
+    @Insert("INSERT INTO file_info (file_name, file_path, file_size, create_time) VALUES (#{fileName}, #{filePath}, #{fileSize}, #{createTime})")
+    void insertFile(File file);
+}

src/main/java/com/aiassistant/model/File.java

@@ -0,0 +1 @@
+在`com.aiassistant.model.File`文件中定义`File`类

src/main/java/com/aiassistant/service/FileService.java

@@ -0,0 +1,42 @@
+package com.aiassistant.service;
+
+import com.aiassistant.mapper.FileMapper;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class FileService {
+    private final FileMapper fileMapper;
+
+    @Autowired
+    public FileService(FileMapper fileMapper) {
+        this.fileMapper = fileMapper;
+    }
+
+    public ResultModel uploadFile(MultipartFile file) {
+        // 校验文件的完整性和合法性
+        if (file.isEmpty()) {
+            return ResultModel.ofError("File is empty");
+        }
+
+        // 保存文件到服务器中
+        try {
+            // TODO: Save file to server
+            // file.transferTo(new File("path/to/save/file"));
+        } catch (Exception e) {
+            return ResultModel.ofError("Failed to save file", e);
+        }
+
+        // 保存文件信息到数据库
+        try {
+            // TODO: Save file information to database
+            // fileMapper.insertFile(file.getOriginalFilename(), file.getSize());
+        } catch (Exception e) {
+            return ResultModel.ofError("Failed to save file information to database", e);
+        }
+
+        return ResultModel.ofSuccess();
+    }
+}

src/main/java/com/aiassistant/utils/ResultModel.java

@@ -1,91 +1,81 @@
 package com.aiassistant.utils;
 
-import lombok.Data;
-
-/**
- * 控制层-对外返回数据结构
- *
- * @param <T>
- */
-@Data
 public class ResultModel<T> {
-
-    private Exception exception = null;
-    private T data = null;
+    private Exception exception;
+    private T data;
     private String msg;
     private Integer code;
 
-    public static <T> ResultModel ofResult(Integer code, String msg, T data) {
-        return ofResult(code, msg, data, null);
+    public static <T> ResultModel<T> ofResult(Integer code, String msg, T data) {
+        ResultModel<T> resultModel = new ResultModel<>();
+        resultModel.setCode(code);
+        resultModel.setMsg(msg);
+        resultModel.setData(data);
+        return resultModel;
     }
 
-    public static <T> ResultModel ofResult(Integer code, String msg, T data, Exception exception) {
-        ResultModel<T> resultModel = new ResultModel();
+    public static <T> ResultModel<T> ofResult(Integer code, String msg, T data, Exception exception) {
+        ResultModel<T> resultModel = new ResultModel<>();
         resultModel.setCode(code);
-        resultModel.setData(data);
         resultModel.setMsg(msg);
+        resultModel.setData(data);
         resultModel.setException(exception);
         return resultModel;
     }
 
-    /**
-     * 创建成功返回
-     *
-     * @return
-     */
-    public static ResultModel ofSuccess() {
+    public static <T> ResultModel<T> ofSuccess() {
+        return ofResult(200, "success", null);
+    }
 
-        return ofSuccess(null);
+    public static <T> ResultModel<T> ofSuccess(T data) {
+        return ofResult(200, "success", data);
     }
 
-    /**
-     * 创建成功返回-带返回数据
-     *
-     * @param data
-     * @param <T>
-     * @return
-     */
-    public static <T> ResultModel ofSuccess(T data) {
+    public static <T> ResultModel<T> ofSuccess(String msg, T data) {
+        return ofResult(200, msg, data);
+    }
 
-        return ofSuccess(null, data);
+    public static <T> ResultModel<T> ofError() {
+        return ofResult(500, "error", null);
     }
 
-    /**
-     * 创建成功返回-带返回信息和返回数据
-     *
-     * @param msg
-     * @param data
-     * @param <T>
-     * @return
-     */
-    public static <T> ResultModel ofSuccess(String msg, T data) {
+    public static <T> ResultModel<T> ofError(String msg) {
+        return ofResult(500, msg, null);
+    }
+
+    public static <T> ResultModel<T> ofError(String msg, Exception exception) {
+        return ofResult(500, msg, null, exception);
+    }
+
+    public Exception getException() {
+        return exception;
+    }
 
-        return ofResult(0, msg, data);
+    public void setException(Exception exception) {
+        this.exception = exception;
     }
 
-    /**
-     * 创建失败返回
-     *
-     * @return
-     */
-    public static ResultModel ofError() {
+    public T getData() {
+        return data;
+    }
 
-        return ofError(null);
+    public void setData(T data) {
+        this.data = data;
     }
 
-    /**
-     * 创建失败返回-带返回信息
-     *
-     * @param msg
-     * @return
-     */
-    public static ResultModel ofError(String msg) {
+    public String getMsg() {
+        return msg;
+    }
 
-        return ofError(msg, null);
+    public void setMsg(String msg) {
+        this.msg = msg;
     }
 
-    public static ResultModel ofError(String msg, Exception exception) {
+    public Integer getCode() {
+        return code;
+    }
 
-        return ofResult(999, msg, null, exception);
+    public void setCode(Integer code) {
+        this.code = code;
     }
 }