MD5加密

 /**
  * MD5加密
  * @param password
  * @return
  */
 public static String md5(String password) {
  // 得到一个信息摘要器
  MessageDigest digest = null;

  try {
   digest = MessageDigest.getInstance("md5");
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  }

  byte[] result = digest.digest(password.getBytes());

  StringBuilder stringBuilder = new StringBuilder();

  String str = "";

  // 与运算 0xff;
  for (int index = 0; index < result.length; index++) {
   // 加盐
   int number = result[index] & 0xff;

   str = Integer.toHexString(number);
   if (str.length() == 1) {
    stringBuilder.append("0");
   }

   stringBuilder.append(str);
  }
  // 标准的md5加密后的结果
  return stringBuilder.toString();
 }