byte--->String

public class BytesToHex {
public static String fromBytesToHex(byte[] resultBytes) {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < resultBytes.length; i++) {
if (Integer.toHexString(0xFF & resultBytes[i]).length() == 1) {
builder.append("0").append(
Integer.toHexString(0xFF & resultBytes[i]));
} else {
builder.append(Integer.toHexString(0xFF & resultBytes[i]));
}
}
return builder.toString();
}