一、说明

给工程添加一个文件上传接口

二、controller

    @Autowired
    private ITestService testService;

    @PostMapping("/upload")
    @ResponseBody
    public String upload(@RequestParam(value = "file") MultipartFile file) {

        if (file.isEmpty()) {
            return "上传失败，请选择文件";
        }

        return testService.upload(file);
    }

三、service

    String upload(MultipartFile file);

四、service impl

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

    @Value("${file.upload.path}")
    private String uploadPath;

    @Override
    public String upload(MultipartFile file) {

        String fileName = file.getOriginalFilename();
        String filePath = uploadPath;

        File dest = new File(filePath);
        // 判断文件夹是否存在
        if (dest.isDirectory()) {
            logger.info("文件夹存在");
        } else {
            logger.info("文件夹不存在，正在创建...");
            dest.mkdirs();
            logger.info("文件夹创建成功");
        }

        dest = new File(filePath + fileName);
        //判断文件是否存在
        if (dest.exists()) {
            logger.info("文件已存在，覆盖之...");
        }

        try {

            file.transferTo(dest);

            logger.info("上传成功");
            logger.info("上传文件路径为：" + filePath + fileName);
            return filePath + fileName;

        } catch (IOException e) {
            logger.error(e.toString(), e);
        }
        return "上传失败！";
    }

五、完成