Java 2进制和16进制的转换

packagecom.test.aes;

/*** 
 * 进制转换工具类
 * 
 */
public classParseSystemUtil {

    /*** 将二进制转换成16进制
     * 
     * @parambuf
     * @return
     */
    public static String parseByte2HexStr(bytebuf[]) {
        StringBuffer sb = newStringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' +hex;
            }
            sb.append(hex.toUpperCase());
        }
        returnsb.toString();
    }

    /*** 将16进制转换为二进制
     * 
     * @paramhexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),
                    16);
            result[i] = (byte) (high * 16 +low);
        }
        returnresult;
    }
}