获取远程url文件的MD5值

    import org.apache.commons.codec.digest.DigestUtils
 
    fun getMd5Hex(url: URL): String {
        var urlIS: InputStream? = null
        var dataInputStream: DataInputStream? = null
        try {
            urlIS = url.openStream()
            dataInputStream = DataInputStream(urlIS)
            return String(Hex.encodeHex(DigestUtils.md5(dataInputStream)))
        } catch (e: Exception) {
            throw e
        } finally {
            dataInputStream?.close();
            urlIS?.close()
        }
    }