自定义图床中七牛云上传默认文件名是文件内容的hash值

[yanjingtp]

自定义图床中七牛云上传默认文件名是文件内容的hash值，建议显示原文件名加时间戳，比如：dom4j1644991521948.jar， 建议修改如下：

            Auth qiniuAuth = Auth.create(qiniuAccessKey, qiniuSecretKey);
            String qiniuUpToken = qiniuAuth.uploadToken(qiniuBucket);

            String fileName = file.getName();
            int index = fileName.lastIndexOf(".");
            String extName = fileName.substring(index + 1, fileName.length());
            String mainName = fileName.substring(0, index);

            String key = mainName + System.currentTimeMillis() + "." + extName;

            try {
                Response response = qiniuUploadManager.put(localFilePath, key, qiniuUpToken);
                DefaultPutRet putRet = new Gson().fromJson(response.bodyString(), DefaultPutRet.class);
                result = qiniuTreaty + "://" + qiniuDomain + "/" + putRet.key;
            } catch (QiniuException e) {
                throw new NullPointerException();
            }