- 先试试这个：
public String test(MultipartFile upload) throws Exception {
byte[] uploadBytes = upload.getBytes();
MessageDigest md5 = MessageDigest.getInstance("MD5");
byte[] digest = md5.digest(uploadBytes);
String hashString = new BigInteger(1, digest).toString(16);
return hashString.toUpperCase();
}
2.参考这个
https://ask.csdn.net/questions/340948
3.如果还是不行，系统的学习下面的
https://www.cnblogs.com/zgghb/p/6020581.html
https://blog.csdn.net/qq_16239775/article/details/79423954
https://blog.csdn.net/u011574420/article/details/80840621
https://blog.csdn.net/ougexingfuba/article/details/75008553