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 FilterInputStream
byte[] shaDigest = shaStream.getMessageDigest().digest();
byte[] md5Digest = md5Stream.getMessageDigest().digest();
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