Conversion of a 16 binary value string to a byte array

/**
* Convert a byte array to a string representing 16 binary values, such as: byte[]{8,18} to: 0813, and public static byte[]
* Hexstr2bytearr (String strin) mutually reversible conversion process
*
* @param ARRB
* Byte array to convert
* @return The converted String
* @throws Exception
* This method does not handle any exceptions, all exceptions are thrown
*/
public static String Bytearr2hexstr (byte[] arrb) throws Exception {
int ilen = Arrb.length;
Each byte is represented by two characters, so the length of the string is twice times the length of the array
StringBuffer sb = new StringBuffer (Ilen * 2);
for (int i = 0; i < Ilen; i++) {
int inttmp = Arrb[i];
Convert negative numbers to positive numbers
while (Inttmp < 0) {
inttmp = inttmp + 256;
}
Numbers less than 0F need to be preceded by 0
if (Inttmp < 16) {
Sb.append ("0");
}
Sb.append (Integer.tostring (inttmp, 16));
}
return sb.tostring ();
}

/**
* Converts a String representing 16 binary values to a byte array, and public static string Bytearr2hexstr (byte[] arrb)
* Reciprocal Reversible conversion process
*
* @param strin
* Strings that need to be converted
* @return converted byte array
* @throws Exception
* This method does not handle any exceptions, all exceptions are thrown
*/
public static byte[] Hexstr2bytearr (String strin) throws Exception {
byte[] Arrb = Strin.getbytes ();
int ilen = Arrb.length;

Two characters represent one byte, so the length of the byte array is the length of the string divided by 2
byte[] Arrout = new BYTE[ILEN/2];
for (int i = 0; i < ilen; i = i + 2) {
String strtmp = new String (ARRB, I, 2);
ARROUT[I/2] = (byte) integer.parseint (strtmp, 16);
}
return arrout;
}

Conversion of a 16 binary value string to a byte array