字符转换为16进制字符串以及转换回来的方法

//16进制字符串转化为字节public static byte[] HexString2Bytes(String hexstr) {byte[] b = new byte[hexstr.length() / 2];int j = 0;for (int i = b.length-1; i >=0; i--) {char c0 = hexstr.charAt(j++);char c1 = hexstr.charAt(j++);b[i] = (byte) ((parse(c0) << 4) | parse(c1));}return b;}private static int parse(char c) {if (c >= 'a')return (c - 'a' + 10) & 0x0f;if (c >= 'A')return (c - 'A' + 10) & 0x0f;return (c - '0') & 0x0f;}//转换为16进制字符串        public static String hexString(String str) {String ret = "";byte[] b;try {b = str.getBytes("GB2312");for (int i = b.length - 1; i >= 0; i--) {String hex = Integer.toHexString(b[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}ret += hex.toUpperCase();}} catch (UnsupportedEncodingException e) {e.printStackTrace();}return ret;}public static void main(String[] args) throws Exception {String str = hexString("好啊tianta了");System.out.println(str);byte[] b = HexString2Bytes(str);String s=new String(b,"GB2312");System.out.println(s);}