异或算法校验码

串口通信，需要用到异或算法进行加密处理，

package comtest.example.admin.lib;

/**
 * Created by wrs on 2019/6/14,10:13
 * projectName: Testz
 * packageName: comtest.example.admin.lib
 */
public class CheckCode {

    public static void main(String[] args) {
        byte[] c;
       // generateCommand((byte) 0x03, new byte[]{0x55,0x45});
       //  generateCommand((byte) 0x03, new byte[]{0x55});
        generateCommand((byte) 0x01, new byte[]{});

        int a=0x03,b=0x00,d=0x01,e=0x55,f=0x02,g=0x54,m=0x45;
        //  0x69    0x03  0x00 0x01     0x55 校验码   0x16

     //   System.out.println("test: "+  (g ^= m));
   /*       c = int2Bytes(0);
        for (int i = 0; i < c.length; i++) {
            System.out.println("test: "+c[i]);
        }*/

    }

    //控制码  和发送指令  长度0或者1   内容0x55或者0xAA
    public static byte[] generateCommand(byte controlCode, byte[] data) {
        int dataLen = 0;
        if (null != data) {
            dataLen = data.length;
        }
        // dataLen = 1
        byte[] command = new byte[6 + dataLen];
        command[0] = 0x69;
        command[1] = controlCode;
        byte[] len = int2Bytes(dataLen);
        command[2] = len[len.length - 2];
        command[3] = len[len.length - 1];

        //  0x69 0x03  0x00 0x01     0x55 校验码   0x16

            for (int i = 0; i < dataLen; i++) {
                command[i + 4] = data[i];
            }

           command[command.length - 2] = generateBCC(command);
           command[command.length - 1] = 0x16;
            for (int i = 0; i < command.length; i++) {
                System.out.println("test: " + command[i] + " size: " + command.length);
            }

        return command;
    }


    //控制码  和发送指令  长度0或者1   内容0x55或者0xAA
    public static byte[] generatesCommand(byte controlCode, byte[] data) {
        int dataLen = 0;
        if (null != data) {
            dataLen = data.length;
        }
        byte[] command = new byte[6 + dataLen];
        command[0] = 0x69;
        command[1] = controlCode;
        byte[] len = int2Bytes(dataLen);
        command[2] = len[0];
        command[3] = len[1];

        for (int i = 0; i < dataLen; i++) {
            command[i + 4] = data[i];
        }

        command[dataLen - 2] = generateBCC(command);
        command[dataLen - 1] = 0x16;

        System.out.println("test: " + command[0] + " size: " + command.length);
        return command;
    }

    public static byte[] int2Bytes(int num) {
        byte[] result = new byte[4];
        result[0] = (byte) (num >>> 24);//取最高8位放到0下标
        result[1] = (byte) (num >>> 16);//取次高8为放到1下标
        result[2] = (byte) (num >>> 8); //取次低8位放到2下标
        result[3] = (byte) (num);      //取最低8位放到3下标
        return result;
    }

    //异或校验码new
    private static byte generateBCC(byte[] data) {
        // 105 3 0 1 85  0 0
        byte bcc = 0x00;
        for (int i = 1; i < data.length-2; ++i) {
            bcc ^= data[i]; // 异或操作
        }
        return bcc;
    }


}