十六进制和二进制相互转换

	//十六进制string转二进制byte[]
	public static byte[] hexStringToByte(String s) {
		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) {
				System.out.println("十六进制转byte发生错误！！！");
				e.printStackTrace();
			}
		}
		return baKeyword;
	}
    
	//二进制byte[]转十六进制string
	public static String byteToHexString(byte[] bytes){
		 StringBuffer sb = new StringBuffer();
		 for (int i = 0; i < bytes.length; i++) {
		      String strHex=Integer.toHexString(bytes[i]);
		      if(strHex.length() > 3){
		    	     sb.append(strHex.substring(6));
		      } else {
		    	   if(strHex.length() < 2){
		    		  sb.append("0" + strHex);
		    	   } else {
		    		  sb.append(strHex);
		    	   }
		      }
		 }
		return  sb.toString();
	}