将32位无符号整数（big endian）转换为long和back

听起来像是ByteBuffer的工作。

有点像

public static void main(String[] args) {    byte[] payload = toArray(-1991249);    int number = fromArray(payload);    System.out.println(number);}public static  int fromArray(byte[] payload){    ByteBuffer buffer = ByteBuffer.wrap(payload);    buffer.order(ByteOrder.BIG_ENDIAN);    return buffer.getInt();}public static byte[] toArray(int value){    ByteBuffer buffer = ByteBuffer.allocate(4);    buffer.order(ByteOrder.BIG_ENDIAN);    buffer.putInt(value);    buffer.flip();    return buffer.array();}