Java 实现32位MD5加密

MD5介绍【链接】

Java代码实现

 public class Md5Util {
     private String Md5Util(String s) {
         try {
             MessageDigest md = MessageDigest.getInstance("MD5");
             byte[] bytes = md.digest(s.getBytes("utf-8"));
             return toHex(bytes);
         } catch (Exception e) {
             throw new RuntimeException(e);
         }
     }

     private static String toHex(byte[] bytes) {

         final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();
         StringBuilder ret = new StringBuilder(bytes.length * 2);
         for (int i = 0; i < bytes.length; i++) {
             ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
             ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
         }
         return ret.toString();
     }
 }