0
当字节小于时，您需要在十六进制值前添加前缀
0x10
。这是一个完整的示例：
public static String md5(String string) { byte[] hash; try { hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8")); } catch (NoSuchAlgorithmException e) { throw new RuntimeException("Huh, MD5 should be supported?", e); } catch (UnsupportedEncodingException e) { throw new RuntimeException("Huh, UTF-8 should be supported?", e); } StringBuilder hex = new StringBuilder(hash.length * 2); for (byte b : hash) { int i = (b & 0xFF); if (i < 0x10) hex.append('0'); hex.append(Integer.toHexString(i)); } return hex.toString();}
