Java 进行BCC异或校验

功能是将传进去的一组十六进制字符串，将其转换成十六进制的异或值

如:

hex 31353738

return 1578

public static String getBCC(String hex) {int i = 0, j = 0;int len = hex.length();short inb[] = new short[len];for (i = 0; i < len; i++) {inb[i] = charToHex(hex.charAt(i));   //将String里的每一个char转换为Hex}for (i = 0; i < len; i++) {    //将每两个Hex合并成一个byteinb[j] = (byte) (((inb[i] << 4) & 0x00f0) | ((inb[i + 1]) & 0x000f));i++;j++;}byte temp = 0x00; //校验值for (i = 0; i < len / 2; i++) { //异或temp ^= inb[i];}byte[] bytes = new byte[1];bytes[0] = temp;return ByteUtil.byteToStr(bytes, bytes.length);}public static short charToHex(char x) { //将单个char转换为Hexshort result = 0;switch (x) {case 'a':result = 10;break;case 'b':result = 11;break;case 'c':result = 12;break;case 'd':result = 13;break;case 'e':result = 14;break;case 'f':result = 15;break;case 'A':result = 10;break;case 'B':result = 11;break;case 'C':result = 12;break;case 'D':result = 13;break;case 'E':result = 14;break;case 'F':result = 15;break;default:result = (short) Character.getNumericValue(x);break;}return result;}

补充一个工具类

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;public class ByteUtil {/*** 向串口发送数据转为字节数组*/public static byte[] hex2byte(String hex) {String digital = "0123456789ABCDEF";String hex1 = hex.replace(" ", "");char[] hex2char = hex1.toCharArray();byte[] bytes = new byte[hex1.length() / 2];byte temp;for (int p = 0; p < bytes.length; p++) {temp = (byte) (digital.indexOf(hex2char[2 * p]) * 16);temp += digital.indexOf(hex2char[2 * p + 1]);bytes[p] = (byte) (temp & 0xff);}return bytes;}/*** 接收到的字节数组转换16进制字符串*/public static String byteToStr(byte[] b, int size) {String ret = "";for (int i = 0; i < size; i++) {String hex = Integer.toHexString(b[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}ret += hex.toUpperCase();}return ret;}/*** 计算CRC16校验码* 逐个求和** @param bytes 字节数组* @return {@link String} 校验码* @since 1.0*/public static String getCRC_16(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;}}}if (Integer.toHexString(CRC).toUpperCase().length() == 2) {return byteToStr(bytes, bytes.length) + "00" + Integer.toHexString(CRC).toUpperCase();} else if (Integer.toHexString(CRC).toUpperCase().length() == 3) {return byteToStr(bytes, bytes.length) + "0" + Integer.toHexString(CRC).toUpperCase();}return byteToStr(bytes, bytes.length) + Integer.toHexString(CRC).toUpperCase();}/*** 指令校验和,并取出后两位字节* */public static String getSum16(byte[] msg, int length) {long mSum = 0;byte[] mByte = new byte[length];/** 逐Byte添加位数和 */for (byte byteMsg : msg) {long mNum = ((long) byteMsg >= 0) ? (long) byteMsg : ((long) byteMsg + 256);mSum += mNum;} /** end of for (byte byteMsg : msg) *//** 位数和转化为Byte数组 */for (int liv_Count = 0; liv_Count < length; liv_Count++) {mByte[length - liv_Count - 1] = (byte) (mSum >> (liv_Count * 8) & 0xff);} /** end of for (int liv_Count = 0; liv_Count < length; liv_Count++) */return byteToStr(msg, length) + byteToStr(mByte, mByte.length).substring(byteToStr(mByte, mByte.length).length() - 4, byteToStr(mByte, mByte.length).length());}/*** 计算校验值*/public static String getCRC_16CheckSum(String hexdata) {if (hexdata == null || hexdata.equals("")) {return "00";}hexdata = hexdata.replaceAll(" ", "");int total = 0;int len = hexdata.length();if (len % 2 != 0) {return "00";}int num = 0;while (num < len) {String s = hexdata.substring(num, num + 2);total += Integer.parseInt(s, 16);num = num + 2;}String data = hexInt(total);return data.substring(data.length() - 2, data.length());}public static String hexInt(int total) {int a = total / 256;int b = total % 256;if (a > 255) {return hexInt(a) + format(b);}return format(a) + format(b);}public static String format(int hex) {String hexa = Integer.toHexString(hex);int len = hexa.length();if (len < 2) {hexa = "0" + hexa;}return hexa;}}

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