使用DigestInputStream从同一个InputStream计算多个校验和

使用DigestInputStream从同一个InputStream计算多个校验和

您可以递归地将a包裹

DigestInputStream

起来

DigestInputStream

，依此类推：

DigestInputStream shaStream = new DigestInputStream(    inStream, MessageDigest.getInstance("SHA-1"));DigestInputStream md5Stream = new DigestInputStream(    shaStream, MessageDigest.getInstance("MD5"));// VERY importANT: read from final stream since it's FilterInputStreambyte[] shaDigest = shaStream.getMessageDigest().digest();byte[] md5Digest = md5Stream.getMessageDigest().digest();