public interface TestService {
  String uploadFileTest(MultipartFile zipFile);
}

---------------------------------------------------------------------
@Service
public class TestServiceImpl implements TestService {

    private static final Logger logger = LoggerFactory.getLogger(TestServiceImpl.class);

    @Override
    public String uploadFileTest(MultipartFile zipFile) {
        // 文件保存路徑
        String targetFilePath = "D:\\360_js";
        
        // 獲取上傳文件的文件名
        String fileName = zipFile.getOriginalFilename();
        
        // 真正地進行文件保存
        File targetFile = new File(targetFilePath + File.separator + fileName);

        // 以下為日志 可要可不要，如果文件保存失敗，1.檢查路徑是否正確 2.是否已經存在該文件 3.可能需要拋出IOException
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(targetFile);
            IOUtils.copy(zipFile.getInputStream(), fileOutputStream);
            // 日志
            logger.info("------>>>>>>uploaded a file successfully!<<<<<<------");
        } catch (IOException e) {
            e.printStackTrace();
            return "IO異常";
        } finally {
            try {
                fileOutputStream.close();
            } catch (IOException e) {
                logger.error("", e);
            }
        }
        return "success";
    }
}

-----------------------------------------------------------------
    @Autowired
    private TestService testService;
    
    @PostMapping("/upload")
    public String uploadFileTest(@RequestParam("uploadFile") MultipartFile zipFile) {
        return testService.uploadFileTest(zipFile);
    }

實體類 entity   FileSaveReqVO.java

    @ApiModelProperty(value = "上傳的文件", required = true)
    @NotNull(message = "上傳文件不能為空")
    private MultipartFile file;

    @ApiModelProperty(value = "文件名稱",hidden = true)
    private String Name;

    @ApiModelProperty(value = "文件地址", hidden = true)
    private String Url;
    ---------------------------------------------------------
接口 interface 
   void save(FileSaveReqVO reqVO);


impl層
@Service
public class KettleTransFileServiceImpl implements IKettleTransFileService {
    
    // 文件保存路徑
    private String path = "D:\\360_js";

    // mapper層控制文件名稱，文件地址保存在數據庫
    @Autowired
    private FileMapper fileMapper;

    @Override
    public void save(FileSaveReqVO reqVO) {

        try {
            // 獲取上傳文件名稱
            String fileName = reqVO.getFile().getOriginalFilename();
           
           // 真正地進行文件保存
            File destFile = new File(kettleHomePath + File.separator + fileName);
            reqVO.getFile().transferTo(destFile);
            
            } catch (IOException e) {
            throw WinExceptionUtil.winException(SchExceptionEnum.SAVE_KETTLE_FILE_ERROR, reqVO.getName());
        }

            // 將文件名稱和地址保存在reqVO 便于保存到數據庫
            reqVO.setName(fileName);
            reqVO.setUrl(path+ fileName);
            
            fileMapper.save(reqVO);
    }
}

controller層

    @PostMapping("/save")
    public String save(FileSaveReqVO reqVO) {
        fileService.save(reqVO);
        return "添加成功";
    }

public void updateFile(Entity entity, MultipartFize file) {
  ......
}