文件上传和下载

public class UploadUtil {

    private static String projectPath = StringUtils.substringBefore(System.getProperty("user.dir").replaceAll("\\\\", "/"),"/");

    /**
     * 自定义上传路径和下载路径进行上传
     * @param files    文件
     * @param uploadPath 上传到路径
     * @return
     * @throws Exception
     */
    public static Map<String, Object> upload(MultipartFile[] files, String uploadPath) throws Exception {
        Map<String, Object> retMap = new HashMap<>();
        if (files != null && files.length > 0) {
            List<UploadVo> fileList = new ArrayList<>();
            for (MultipartFile file : files) {
                UploadVo entity = new UploadVo();
                String fileName = file.getOriginalFilename();
                String path = projectPath + uploadPath + fileName;
                File dest = new File(path);
                if (!dest.getParentFile().exists()) {
                    dest.getParentFile().mkdirs();
                }
                file.transferTo(dest);
                entity.setName(fileName);
                entity.setUrl(fileName);
                fileList.add(entity);
            }
            retMap.put("data", fileList);
            retMap.put("success", true);
        } else {
            retMap.put("data", null);
            retMap.put("success", false);
        }
        return retMap;
    }
}

public class DownloadUtil {

    /**
     * 按路径进行下载
     * @param path
     * @param request
     * @param response
     * @throws Exception
     */
    public static void download(String path, HttpServletRequest request, HttpServletResponse response) throws Exception {
        try {
            Path file = Paths.get(path);
            if (Files.exists(file)) {
                String contentType = Files.probeContentType(Paths.get(path));
                response.setContentType(contentType);
                String filename = new String(file.getFileName().toString().getBytes("UTF-8"), "ISO-8859-1");
                response.addHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", filename));
                response.setCharacterEncoding("UTF-8");
                Files.copy(file, response.getOutputStream());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}