MD5加密（可用作做密码进行加密，不可逆）

废话不多说，直接上代码。jdk自带的加密工具。

public class MD5Util {      private MD5Util() {     }      public static String md5(String sourceStr) {         byte[] secretBytes = null;         try {             secretBytes = MessageDigest.getInstance("md5").digest(sourceStr.getBytes());         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException("异常！");         }         String md5code = new BigInteger(1, secretBytes).toString(16);//         //         for (int i = 0; i < 32 - md5code.length(); i++) {             md5code = "0" + md5code;         }         return md5code;     } } 

文章来源: https://blog.csdn.net/qq_33029793/article/details/92379193