java 16进制转换十进制，Double、Int整型

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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();
}
}