java文件上传，返回访问url

    @Value("${filepath.imgdir}")
    private String imgDir;  //存储路径 D:\xxx\
    @Value("${filepath.imgurl}")
    private String imgUrl; //地址url http://localhost:8080/img/
    /**
     * 图片上传
     *
     * @param file
     * @return
     */
    @RequestMapping(value = "/upload")
    public R busupload(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return R.error("文件为空");
        }
        String url;
        try {
            String fileName = file.getOriginalFilename();
            assert fileName != null;
            String suffixName = fileName.substring(fileName.lastIndexOf("."));
            String uuid = CommonUtils.getUuid();
            String saveName = uuid + suffixName;
            url = imgUrl + saveName;
            CommonUtils.saveFile(file, imgDir, saveName);
        } catch (Exception e) {
            e.printStackTrace();
            return R.error("上传失败");
        }
        return R.ok().put("url", url);
    }

saveFile方法

  /**
     * 创建文件夹，创建文件
     *
     * @param file     文件
     * @param rootpath 根路径
     * @param saveFile 文件名
     * @return
     */
    public static boolean saveFile(MultipartFile file, String rootpath, String saveFile) {
        try {
            File dest = new File(rootpath + saveFile);
            // ·
            if (!dest.getParentFile().exists()) {
                boolean mkdirs = dest.getParentFile().mkdirs();
                if (!mkdirs) {
                    return false;
                }
            }
            file.transferTo(dest);
            return true;
        } catch (IllegalStateException | IOException e) {
            return false;
        }
    }

WebMvc配置文件

    @Value("${filepath.imgdir}")
    private String imgDir;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/img/**").addResourceLocations("file:" + imgDir);
    }