位元組數組和十六進位字串之間的轉換

//位元組碼轉換成16進位字串  private static String byte2hex(byte[] b) {    String hs="";    String stmp="";    for (int n=0;n<b.length;n++){      stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));      if (stmp.length()==1)        hs=hs+"0"+stmp;      else hs=hs+stmp;        //if (n<b.length-1)  hs=hs+":";      }    return hs.toUpperCase();  }    //16進位字串轉換成位元組碼  private static byte[] hex2byte(String h) {    byte[] ret = new byte[h.length()/2];    for(int i=0; i<ret.length; i++){    ret[i] = Integer.decode("#"+h.substring(2*i, 2*i+2)).byteValue();    }    return ret;  }