原先的文件夹的列表

现在将文件全部拷贝到另外的一个文件夹下面

//弥补方法：将原先已经存在/fastone/billing/data 下的所有账单move到/fastone/billing/bills，便于统一管理
		fun moveDataFileToBillsFile() {
			val oldDataFile = Paths.get(Path.of(PathConst.OUTPUT_PATH, "data").toUri()).toFile()
			val newBillsFilepath = Paths.get(Path.of(PathConst.OUTPUT_PATH, PathConst.BILL_FOLDER).toUri())
			if (!newBillsFilepath.exists()) {
				newBillsFilepath.toFile().mkdirs()
			}
			if (oldDataFile.exists()) {
				FileUtil.copyFolder(oldDataFile, newBillsFilepath.toFile())
			}

		}

/**
	 * 复制一个目录及其子目录、文件到另外一个目录
	 * @param src
	 * @param dest
	 * @throws IOException
	 */
	@Throws(IOException::class)
	fun copyFolder(src: File, dest: File) {
		if (src.isDirectory) {
			if (!dest.exists()) {
				dest.mkdir()
			}
			val files = src.list()
			for (file in files) {
				val srcFile = File(src, file)
				val destFile = File(dest, file)
				// 递归复制
				copyFolder(srcFile, destFile)
			}
		} else {
			val `in`: InputStream = FileInputStream(src)
			val out: OutputStream = FileOutputStream(dest)
			val buffer = ByteArray(1024)
			var length: Int
			while (`in`.read(buffer).also { length = it } > 0) {
				out.write(buffer, 0, length)
			}
			`in`.close()
			out.close()
		}
	}