public class ByteUtil {
/**
* 字符串转化成为16进制字符串
*
* @param s
* @return
*/
public static String strTo16(String s) {
String str = "";
for (int i = 0; i < s.length(); i++) {
int ch = (int) s.charAt(i);
String s4 = Integer.toHexString(ch);
str = str + s4;
}
return str;
}
/**
* 16进制转换成为string类型字符串
*
* @param s
* @return
*/
public static String hexStringToString(String s) {
if (s == null || s.equals("")) {
return null;
}
s = s.replace(" ", "");
byte[] baKeyword = new byte[s.length() / 2];
for (int i = 0; i < baKeyword.length; i++) {
try {
baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
} catch (Exception e) {
e.printStackTrace();
}
}
try {
s = new String(baKeyword, "UTF-8");
new String();
} catch (Exception e1) {
e1.printStackTrace();
}
return s;
}
/**
* 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 bytes2HexString(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;
}
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
/**
* 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());
}
}