Java gets CRC 16-bit check code

    /**
     * 计算CRC16校验码
     *
     * @param bytes
     * @return
     */
    public static String getCRC(byte[] bytes) {
        int CRC = 0x0000ffff;
        int POLYNOMIAL = 0x0000a001;

        int i, j;
        for (i = 0; i < bytes.length; i++) {
            CRC ^= ((int) bytes[i] & 0x000000ff);
            for (j = 0; j < 8; j++) {
                if ((CRC & 0x00000001) != 0) {
                    CRC >>= 1;
                    CRC ^= POLYNOMIAL;
                } else {
                    CRC >>= 1;
                }
            }
        }
        //高低位转换，看情况使用（譬如规定校验码高位在前低位在后，也就不需要转换高低位)
        CRC = ( (CRC & 0x0000FF00) >> 8) | ( (CRC & 0x000000FF ) << 8);
        return Integer.toHexString(CRC);
    }