下面直接贴代码

1.  将GB2312转化为中文,如BAFAC2DCB2B7→胡萝卜,两个字节合成一个文字

    public static String stringToGbk(String string) throws Exception {
        byte[] bytes = new byte[string.length() / 2];
        for (int j = 0; j < bytes.length; j++) {
            byte high = Byte.parseByte(string.substring(j * 2, j * 2 + 1), 16);
            byte low = Byte.parseByte(string.substring(j * 2 + 1, j * 2 + 2),
                    16);
            bytes[j] = (byte) (high << 4 | low);
        }
        String result = new String(bytes, "GBK");
        return result;
    }

2.将中文转化为GB2312,并且结果以byte[]形式返回,如胡萝卜→new byte[]{BA  FA C2 DC B2 B7}，一个字被分为两个字节

    public static byte[] gbkToString(String str) throws Exception {
        return new String(str.getBytes("GBK"), "gb2312").getBytes("gb2312");
    }

 3.将十六进制的byte[]原封不动的转化为string，如byte[]{0x7e，0x80,0x11,0x20}→7e801120,可用于log打印

    public static String bytesToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || src.length <= 0) {
            return null;
        }
        for (int i = 0; i < src.length; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

4.将十六进制的byte[]原封不动的转化为string，并且每个byte之间用空格分开，如byte[]{0x7e，0x80,0x11,0x20}→7e 80 11 20，,可用于log打印

    public static StringBuilder byte2HexStr(byte[] data) {

        if (data != null && data.length > 0) {
            StringBuilder stringBuilder = new StringBuilder(data.length);
            for (byte byteChar : data) {
                stringBuilder.append(String.format("%02X ", byteChar));
            }
            return stringBuilder;
        }
        return null;
    }

5.将byte[]数组转化为8、10、16等各种进制，例如byte[0x11,0x20]→4384，约等于1120（16进制）→4384，radix代表进制

    public static String bytesToAllHex(byte[] bytes, int radix) {
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
    }

6.将String的十六进制原封不动转化为byte的十六进制，例如7e20→new byte[]{0x7e，x20}

public static byte[] HexString2Bytes(String src) {
        byte[] ret = new byte[src.length() / 2];
        byte[] tmp = src.getBytes();
        for (int i = 0; i < tmp.length / 2; i++) {
            ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
        }
        return ret;
    }

    public static byte uniteBytes(byte src0, byte src1) {
        byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 }))
                .byteva lue();
        _b0 = (byte) (_b0 << 4);
        byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 }))
                .byteva lue();
        byte ret = (byte) (_b0 ^ _b1);
        return ret;
    }