/**

     * 16进制转ASCII

     *

     * @param hex

     * @return

     */

    public static String hex2Str(String hex) {

        StringBuilder sb = new StringBuilder();

        StringBuilder temp = new StringBuilder();

        //49204c6f7665204a617661 split into two characters 49, 20, 4c...

        for (int i = 0; i < hex.length() - 1; i += 2) {

            //grab the hex in pairs

            String output = hex.substring(i, (i + 2));

            //convert hex to decimal

            int decimal = Integer.parseInt(output, 16);

            //convert the decimal to character

            sb.append((char) decimal);

            temp.append(decimal);

        }

        return sb.toString();

    }