/**

• 鉴权签名
  /
  public static String getSign(String key, Map<String, String> map, String encode) {
  ArrayList list = new ArrayList();
  for (Map.Entry<String, String>entry : map.entrySet()) {
  if (StringUtils.isNotBlank(entry.getValue())) {//空值不参与加密
  list.add(entry.getKey() + "=" + entry.getValue() + "&");// key=value+
  }
  }
  int size = list.size();
  String[] arrayToSort = list.toArray(new String[size]);
  Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
  StringBuilder sb = new StringBuilder();
  for (int i = 0; i < size; i++) {
  sb.append(arrayToSort[i]);
  }
  String result = sb.toString();
  result += "key=" + key;
  try {
  logger.info("md5之前：\n"+result);
  result = MD5Util.crypt(result, encode);
  logger.info(result);
  } catch (Exception e) {
  e.printStackTrace();
  }
  return result;
  }
  /*
• Encodes a string 2 MD5
• @param str String to encode
• @return Encoded String
• @throws NoSuchAlgorithmException
• @throws UnsupportedEncodingException
  */
  public static String crypt(String str, String encode) throws NoSuchAlgorithmException, UnsupportedEncodingException {
  if (str == null || str.length() == 0) {
  throw new IllegalArgumentException("String to encript cannot be null or zero length");
  }
  StringBuffer hexString = new StringBuffer();
  MessageDigest md = MessageDigest.getInstance("MD5");
  md.update(str.getBytes(encode));
  byte[] hash = md.digest();
  for (int i = 0; i < hash.length; i++) {
  if ((0xff & hash[i]) < 0x10) {
  hexString.append("0" + Integer.toHexString((0xFF & hash[i])));
  } else {
  hexString.append(Integer.toHexString(0xFF & hash[i]));
  }
  }
  return hexString.toString().toUpperCase();
  }