你确定你的密钥和输入是相同的,并在java和python中正确编码？

HMAC-SHA256在两个平台上的工作方式相同.

Java的

Mac sha256_HMAC = Mac.getInstance("HmacSHA256");

SecretKeySpec secretKey = new SecretKeySpec("1234".getBytes(), "HmacSHA256");

sha256_HMAC.init(secretKey);

byte[] hash = sha256_HMAC.doFinal("test".getBytes());

String check = Hex.encodeHexString(hash);

System.out.println(new String(check));

Output

24c4f0295e1bea74f9a5cb5bc40525c8889d11c78c4255808be00defe666671f

Python

print hmac.new("1234", "test", hashlib.sha256).hexdigest();

Output

24c4f0295e1bea74f9a5cb5bc40525c8889d11c78c4255808be00defe666671f