code: public static char[] bytes2Chars(final byte[] bytes) {
          if (bytes == null) return null;
          int len = bytes.length;
          if (len <= 0) return null;
          char[] chars = new char[len];
          for (int i = 0; i < len; i++) {
              chars[i] = (char) (bytes[i] & 0xff);
          }
          return chars;
      }
docs: byteArr转charArr
  
  @param bytes 字节数组
  @return 字符数组