java 基本数据型之间的转换

java   long转换成Bytes

    public static byte[] longToBytes(long primitive) {
        ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
        buffer.putLong(primitive);
        return buffer.array();
    }

java Byte转换成long

    public static long bytesToLong(byte[] array) {
        ByteBuffer buffer = ByteBuffer.allocate(Long.SIZE / Byte.SIZE);
        buffer.put(array);
        buffer.flip();
        long value = buffer.getLong();
        return value;
    }