将十六进制string转成byte数组
public static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
private static String ByteArrayToHexString(byte[] data) //java可用
{
String result = "";
for (int i = 0; i < data.length; i++)
{
String hex = Integer.toHexString(data[i] & 0xFF);
if (hex.length() == 1)
{
hex = "0" + hex;
}
result += hex.toUpperCase();
}
return result;
}
private static byte[] intToBytes2(int n) {
byte[] b = new byte[4];
for (int i = 0; i < 4; i++) {
b[i] = (byte) (n >> (24 - i * 8));
}
return b;
}
