Java 自动生成不存在的文件名 文件自动重命名功能 支持带后缀的文件名

    /**
     * 如果文件已存在 则自动重命名为带后缀的文件名
     */
    private String generateNotExistFileName(String src) {
        String path = src;
        String extension = FilenameUtils.getExtension(path);
        boolean hasExtension = StrUtil.isNotBlank(extension);
        int i = 1;
        while (FileUtil.exist(path)) {
            if (hasExtension) {
                path = StrUtil.subBefore(path, ".", true);
            }
            boolean hasSuffix = path.contains("(") && path.endsWith(")");
            if (!hasSuffix) {
                path = path + "(" + i + ")";
                i++;
            } else {
                String suffix = StrUtil.subAfter(path, "(", true);
                path = StrUtil.subBefore(path, "(", true);
                final char c = suffix.charAt(0);
                final int integer = Convert.toInt(c) + 1;
                path = path + "(" + integer + ")";
            }
            path = path + "." + extension;

        }
        return path;
    }