进制转换等工具类

public class ConvertUtils {

    public static byte[] hexStringToByte(String hex) {
        int len = (hex.length() / 2);
        byte[] result = new byte[len];
        char[] achar = hex.toCharArray();
        for (int i = 0; i < len; i++) {
            int pos = i * 2;
            result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
        }
        return result;
    }

    public static byte[] parseHexStringToBytes(final String hex) {
        String tmp = hex.substring(2).replaceAll("[^[0-9][a-f]]", "");
        byte[] bytes = new byte[tmp.length() / 2]; // every two letters in the string are one byte finally

        String part = "";

        for(int i = 0; i < bytes.length; ++i) {
            part = "0x" + tmp.substring(i*2, i*2+2);
            bytes[i] = Long.decode(part).byteValue();
        }

        return bytes;
    }

    private static byte toByte(char c) {
        byte b = (byte) "0123456789ABCDEF".indexOf(c);
        return b;
    }

    /**
     * 把字节数组转换成16进制字符串
     * @param bArray
     * @return
     */
    public static final String bytesToHexString(byte[] bArray) {
        StringBuffer sb = new StringBuffer(bArray.length);
        String sTemp;
        for (int i = 0; i < bArray.length; i++) {
            sTemp = Integer.toHexString(0xFF & bArray[i]);
            if (sTemp.length() < 2)
                sb.append(0);
            sb.append(sTemp.toUpperCase());
        }
        return sb.toString();
    }


    /**
     * 把16进制转换成10进制
     * @param hexString
     * @return
     */
    public static int hexToDec(final String hexString) {
        return Integer.parseInt(hexString,16);
    }


    /**
     * 把字节数组转换为对象
     * @param bytes
     * @return
     * @throws IOException
     * @throws ClassNotFoundException
     */
    public static final Object bytesToObject(byte[] bytes) throws IOException, ClassNotFoundException {
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        ObjectInputStream oi = new ObjectInputStream(in);
        Object o = oi.readObject();
        oi.close();
        return o;
    }

    /**
     * 把可序列化对象转换成字节数组
     * @param s
     * @return
     * @throws IOException
     */
    public static final byte[] objectToBytes(Serializable s) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ObjectOutputStream ot = new ObjectOutputStream(out);
        ot.writeObject(s);
        ot.flush();
        ot.close();
        return out.toByteArray();
    }

    public static final String objectToHexString(Serializable s) throws IOException{
        return bytesToHexString(objectToBytes(s));
    }

    public static final Object hexStringToObject(String hex) throws IOException, ClassNotFoundException{
        return bytesToObject(hexStringToByte(hex));
    }

    /**
     * @函数功能: BCD码转为10进制串(阿拉伯数据)
     * @输入参数: BCD码
     * @输出结果: 10进制串
     */
    public static String bcd2Str(byte[] bytes){
        StringBuffer temp=new StringBuffer(bytes.length*2);

        for(int i=0;i>>4));
            temp.append((byte)(bytes[i]& 0x0f));
        }
        return temp.toString().substring(0,1).equalsIgnoreCase("0")?temp.toString().substring(1):temp.toString();
    }

    /**
     * @函数功能: 10进制串转为BCD码
     * @输入参数: 10进制串
     * @输出结果: BCD码
     */
    public static byte[] str2Bcd(String asc) {
        int len = asc.length();
        int mod = len % 2;

        if (mod != 0) {
            asc = "0" + asc;
            len = asc.length();
        }

        byte abt[] = new byte[len];
        if (len >= 2) {
            len = len / 2;
        }

        byte bbt[] = new byte[len];
        abt = asc.getBytes();
        int j, k;

        for (int p = 0; p < asc.length()/2; p++) {
            if ( (abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {
                j = abt[2 * p] - '0';
            } else if ( (abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {
                j = abt[2 * p] - 'a' + 0x0a;
            } else {
                j = abt[2 * p] - 'A' + 0x0a;
            }

            if ( (abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {
                k = abt[2 * p + 1] - '0';
            } else if ( (abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {
                k = abt[2 * p + 1] - 'a' + 0x0a;
            }else {
                k = abt[2 * p + 1] - 'A' + 0x0a;
            }

            int a = (j << 4) + k;
            byte b = (byte) a;
            bbt[p] = b;
        }
        return bbt;
    }
    /** *//**
     * @函数功能: BCD码转ASC码
     * @输入参数: BCD串
     * @输出结果: ASC码
     */
    public static String BCD2ASC(byte[] bytes) {
        StringBuffer temp = new StringBuffer(bytes.length * 2);

//      for (int i = 0; i < bytes.length; i++) {
//       int h = ((bytes[i] & 0xf0) >>> 4);
//       int l = (bytes[i] & 0x0f);
//       temp.append(BToA[h]).append( BToA[l]);
//      }
        return temp.toString() ;
    }

    /** *//**
     * MD5加密字符串，返回加密后的16进制字符串
     * @param origin
     * @return
     */
    public static String MD5EncodeToHex(String origin) {
        return bytesToHexString(MD5Encode(origin));
    }

    /** *//**
     * MD5加密字符串，返回加密后的字节数组
     * @param origin
     * @return
     */
    public static byte[] MD5Encode(String origin){
        return MD5Encode(origin.getBytes());
    }

    /** *//**
     * MD5加密字节数组，返回加密后的字节数组
     * @param bytes
     * @return
     */
    public static byte[] MD5Encode(byte[] bytes){
        MessageDigest md=null;
        try {
            md = MessageDigest.getInstance("MD5");
            return md.digest(bytes);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return new byte[0];
        }
    }
}