Java 实现32位MD5加密

MD5介绍【链接】

Java代码实现

1 1 public class Md5Util {
2 2     private String Md5Util(String s) {
3 3         try {
4 4             MessageDigest md = MessageDigest.getInstance("MD5");
5 5             byte[] bytes = md.digest(s.getBytes("utf-8"));
6 6             return toHex(bytes);
7 7         } catch (Exception e) {
8 8             throw new RuntimeException(e);
9 9         }
1010     }
1111 
1212     private static String toHex(byte[] bytes) {
1313 
1414         final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();
1515         StringBuilder ret = new StringBuilder(bytes.length * 2);
1616         for (int i = 0; i < bytes.length; i++) {
1717             ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
1818             ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
1919         }
2020         return ret.toString();
2121     }
2222 }