java 16进制转换十进制，Double、Int整型

import org.apache.commons.lang3.StringUtils;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.BigInteger;

public class RadarDecodeUtil {

    public static void main(String[] args) {

        System.out.println("大小端转换前=="+"6B6BB23BA3B55F0C");
        System.out.println("大小端转换后=="+bigEndianChangeLittleEndian("6B6BB23BA3B55F0C"));
    }

    public static String bigEndianChangeLittleEndian(String str){
        if(!org.springframework.util.StringUtils.isEmpty(str)){
            byte[] bytes1 = hexStrToByteArrs(str);
            //System.out.println("====="+bytes1.length);
            byte[] bytes2 = new byte[str.length() / 2];
            int index = 0;
            for (int i = bytes1.length - 1; i>=0; i--){
                bytes2[index] = bytes1[i];
                index++;
            }
            return bytesToHexString(bytes2);
        }
        return null;
    }

    /**
     * hexStr 字符串转换为    字符串
     * @param  hexStr
     * @return
     */
    public static String hexStrToString(String hexStr){
        String str = "0123456789ABCDEF";
        char[] hexs = hexStr.toCharArray();
        byte[] bytes = new byte[hexStr.length() / 2];
        int n;
        for (int i = 0; i < bytes.length; i++) {
            n = str.indexOf(hexs[2 * i]) * 16;
            n += str.indexOf(hexs[2 * i + 1]);
            bytes[i] = (byte) (n & 0xff);
        }
        String returnStr = new String(bytes);
        return returnStr;
    }


    /**
     * hexStr 转 UnsignedLong
     * @param hexStr
     * @return
     */
    public static Long hexStrToUnsignedLong(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        return Long.parseUnsignedLong(hexStr,16);
    }

    /**
     * hexStr 转 Double
     * @param hexStr
     * @return
     */
    public static Double hexStrToDouble(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        long longBits = Long.valueOf(hexStr,16).longValue();
        return Double.longBitsToDouble(longBits);
    }

    /**
     * hexStr 转 Float
     * @param hexStr
     * @return
     */
    public static Float hexStrToFloat(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        Integer integerBits = Integer.valueOf(hexStr,16);
        return Float.intBitsToFloat(integerBits);
    }

    /**
     * hexStr 转 BigDecimal
     * @param hexStr
     * @return
     */
    public static BigDecimal hexStrToBigDecimal(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        BigInteger bigInteger = new BigInteger(hexStr, 16);
        return new BigDecimal(bigInteger);
    }

    /**
     * hexStr 转 Byte
     * @param hexStr
     * @return
     */
    public static Byte hexStrToByte(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        return Byte.parseByte(hexStr,16);
    }
    /**
     * hexStr 转 Integer
     * @param hexStr
     * @return
     */
    public static Integer hexStrToInteger(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        return Integer.parseInt(hexStr,16);
    }

    /**
     * hexStr 转 BigInteger
     * @param hexStr
     * @return
     */
    public static BigInteger hexStrToBigInteger(String hexStr){
        if(StringUtils.isEmpty(hexStr)){
            return null;
        }
        return new BigInteger(hexStr,16);
    }

    /**
     * 将十六进制的字符串转换成字节数组
     *
     * @param hexString
     * @return
     */
    public static byte[] hexStrToByteArrs(String hexString) {
        if (StringUtils.isEmpty(hexString)) {
            return null;
        }

        hexString = hexString.replaceAll(" ", "");
        int len = hexString.length();
        int index = 0;

        byte[] bytes = new byte[len / 2];

        while (index < len) {
            String sub = hexString.substring(index, index + 2);
            bytes[index / 2] = (byte) Integer.parseInt(sub, 16);
            index += 2;
        }

        return bytes;
    }

    /**
     * 数组转换成十六进制字符串
     *
     * @param bArray
     * @return HexString
     */
    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();
    }
}