public static Byte[] CRC_calculate(byte[] data){
        int POLYNOMIAL = 0xA001;      // CRC-16/IBM 生成多項式0xA001
        int INITIAL_VALUE = 0xFFFF;   // 初始值0xFFFF
        int crc = INITIAL_VALUE;
        for (byte b : data) {  //遍歷所有的字節(jié)
            crc ^= (b & 0xFF); 
            for (int i = 8; i != 0; i--) {
                if ((crc & 0x0001) != 0) {
                    crc >>= 1;
                    crc ^= POLYNOMIAL;
                } else {
                    crc >>= 1;
                }
            }
        }
        List<Byte> list = new ArrayList<>();
        // MODBUS的低位在前
        list.add((byte) (crc & 0xff));     // 低位
        list.add((byte) (crc >> 8));       // 高位
        return list.toArray(new Byte[0]);  // 轉換為Byte數(shù)組
    }
    //主函數(shù)
    public class Main {
    public static void main(String[] args) {
    byte[] data = {0x01, 0x03, 0x00, 0x20, 0x00, 0x01};
    //byte[] data = {0x01, 0x03, 0x02, 0x27, 0x10}; 
        Byte[] crc = CRC_calculate(data);
        System.out.println("CRC-16 Modbus length: " + crc.length);
        System.out.println("CRC-16 Modbus1: " + String.format("%X", crc[0]));
        System.out.println("CRC-16 Modbus2: " + String.format("%X", crc[1]));
    }
}