进制转换

    /**
     * @return 二进制数组转换为二进制字符串   2-2
     */
    public static String bytes2BinStr(byte[] bArray){

        String outStr = "";
        int pos = 0;
        for(byte b:bArray){
            //高四位
            pos = (b&0xF0)>>4;
            outStr+=binaryArray[pos];
            //低四位
            pos=b&0x0F;
            outStr+=binaryArray[pos];
        }
        return outStr;
    }

    /**
     * @return 将二进制数组转换为十六进制字符串  2-16
     */
    public static String bin2HexStr(byte[] bytes){

        String result = "";
        String hex = "";
        for(int i=0;i<bytes.length;i++){
            //字节高4位
            hex = String.valueOf(hexStr.charAt((bytes[i]&0xF0)>>4));
            //字节低4位
            hex += String.valueOf(hexStr.charAt(bytes[i]&0x0F));
            result +=hex;  //+" "
        }
        return result;
    }

    /**
     * @return 将十六进制转换为二进制字节数组   16-2
     */
    public static byte[] hexStr2BinArr(String hexString){
        //hexString的长度对2取整，作为bytes的长度
        int len = hexString.length()/2;
        byte[] bytes = new byte[len];
        byte high = 0;//字节高四位
        byte low = 0;//字节低四位
        for(int i=0;i<len;i++){
            //右移四位得到高位
            high = (byte)((hexStr.indexOf(hexString.charAt(2*i)))<<4);
            low = (byte)hexStr.indexOf(hexString.charAt(2*i+1));
            bytes[i] = (byte) (high|low);//高地位做或运算
        }
        return bytes;
    }

    /**
     * @return 将十六进制转换为二进制字符串   16-2
     */
    public static String hexStr2BinStr(String hexString){
        return bytes2BinStr(hexStr2BinArr(hexString));
    }

    // 接受一个192位的二进制字符串，调整一下高低位的顺序
    // 每八位反转一下
    public static String modifyOrder(String str){
        // System.out.println("#############before" + str);
        StringBuffer sb = new StringBuffer();
        for(int i=0; i<24; i++){
            String reverse = new StringBuffer(str.substring(i*8, i*8+8)).reverse().toString();
            sb.append(reverse);
        }
        //System.out.println("#############afterr" + sb.toString());
        return sb.toString();
    }


    // 16进制转化成ASCII码
    public static String convertHexToString(String hex) {
        if(hex == null){
            return "";
        }
        hex = hex.trim();
        StringBuilder sb = new StringBuilder();
        StringBuilder temp = new StringBuilder();
        // 564e3a322d302e312e34 split into two characters 56, 4e, 3a...
        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);
        }
        // System.out.println(sb.toString());
        return sb.toString().trim();
    }