使用MD5加密密码工具类

public class PasswordUtil {      private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",              "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };        /**      * 转换字节数组为16进制字串      *       * @param b      *            字节数组      * @return 16进制字串      */      public static String byteArrayToHexString(byte[] b) {          StringBuffer resultSb = new StringBuffer();          for (int i = 0; i < b.length; i++) {              resultSb.append(byteToHexString(b[i]));          }          return resultSb.toString();      }        private static String byteToHexString(byte b) {          int n = b;          if (n < 0)              n = 256 + n;          int d1 = n / 16;          int d2 = n % 16;          return hexDigits[d1] + hexDigits[d2];      }        public static String MD5Encode(String origin) {          String resultString = null;          try {              resultString = new String(origin);              MessageDigest md = MessageDigest.getInstance("MD5");              resultString = byteArrayToHexString(md.digest(resultString                      .getBytes()));          } catch (Exception ex) {          }          return resultString;      }        public static void main(String[] args) {          System.err.println(MD5Encode("123456"));      }  }  

123456密码加密后输出的是：e10adc3949ba59abbe56e057f20f883e