file.path=D:\\flies\\springboot\\

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@Component
@ConfigurationProperties(prefix = "file")
public class FileConfig {
    private String path;
}

FileConfig fileConfig = new FileConfig();
// 文件保存目錄
String filePath = fileConfig.getPath();

    @PostMapping("/upload/")
    @ResponseBody
    public  Response upload(MultipartFile file) {
        // 驗證是否有文件
        if(file == null || file.isEmpty()){
            return Response.newFail("Upload failed, please select file",400);
        }
        FileConfig fileConfig = new FileConfig();
        // 文件保存目錄
        String filePath = fileConfig.getPath();

        // 驗證文件夾
        File folder = new File(filePath);
        if (!folder.exists()) {
            folder.mkdirs();
        }

        // 文件名
        String fileName = UUID.randomUUID() + file.getOriginalFilename();
        filePath = filePath  + fileName;
        File saveFile = new File(filePath);
        try {
            file.transferTo(saveFile);
            return  Response.newSuccess("Upload successful");
        } catch (IOException e) {
            e.printStackTrace();
            return  Response.newFail("Upload failed",50001);
        }
    }