code: public static byte[] longToBytes(long longValue) {
  		// Magic number 8 should be defined as Long.SIZE / Byte.SIZE
  		final byte[] result = new byte[8];
  		for (int i = 7; i >= 0; i--) {
  			result[i] = (byte) (longValue & 0xFF);
  			longValue >>= 8;
  		}
  		return result;
  	}
docs: long转byte数组<br>
  from: https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java
  
  @param longValue long值
  @return byte数组
  @since 3.2.0