文件上传下载

/**
 * 文件上传
 * @return
 */
@PostMapping(value = "/upload")
public String fileUpload(@RequestParam MultipartFile file) throws IOException {

    //获取源文件名
    String originalFilename = file.getOriginalFilename();
    //获取文件类型
    String fileType = FileUtil.extName(originalFilename);
    //获取文件大小
    long fileSize = file.getSize();

    String uuid = splitName(originalFilename);
    //存储到磁盘 父目录/files/
    File uploadParentFile = new File(fileUploadPath);

    //图片文件xxxx.png
    File uploadFile = new File(fileUploadPath + uuid);
    //判断文件是否存在然后创建一个
    if(!uploadParentFile.exists()){
        uploadParentFile.mkdir();
    }

    String url = null;
    // 获取文件md5
    String md5;



    file.transferTo(uploadFile);
    md5 = SecureUtil.md5(uploadFile);

    UserFile dbFiles = getFileByMd5(md5);

    //文件存在
    if(dbFiles != null){
        url = dbFiles.getFileurl();
        uploadFile.delete();
    } else {
        url = "http://localhost:9999/file/"+uuid;
        // 存储到数据库,
        UserFile saveFile = new UserFile();
        saveFile.setFilename(originalFilename);
        saveFile.setFiletype(fileType);
        saveFile.setFilesize(fileSize/1024);
        saveFile.setFileurl(url);
        saveFile.setMd5(md5);
        fileMapper.insert(saveFile);
    }
    

    if(StringUtils.isEmpty(url)){
        System.out.println("url is empty>>>>>>>>>>>>>>>>");
    } else {
        System.out.println("url>>>>>>>>>>>>>>>>>>>" + url);
    }
    
    return url;
}

/**
 * 下载文件
 * @param uuid
 * @param response
 */
@GetMapping(value = "/{uuid}")
public void download(@PathVariable String uuid, HttpServletResponse response){

    //根据文件唯一标识获取文件
    File uploadFile = new File(fileUploadPath + uuid);

    try {
        //设置输出格式
        ServletOutputStream os = response.getOutputStream();
        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(uuid,"UTF-8"));
        response.setContentType("application/octet-stream");

        //通过流的方式进行读取
        os.write(FileUtil.readBytes(uploadFile));
        os.flush();
        os.close();
    } catch (IOException e) {
        e.printStackTrace();
    }


}