public class HexUtil
{
/**
* 16进制中的字符集
*/
private static final String HEX_CHAR = "0123456789ABCDEF";
/**
* 16进制中的字符集对应的字节数组
*/
private static final byte[] HEX_STRING_BYTE = HEX_CHAR.getBytes();
/**
* 10进制字节数组转换为16进制字节数组
* <p>
* byte用二进制表示占用8位，16进制的每个字符需要用4位二进制位来表示，则可以把每个byte
* 转换成两个相应的16进制字符，即把byte的高4位和低4位分别转换成相应的16进制字符，再取对应16进制字符的字节
*
* @param b 10进制字节数组
* @return 16进制字节数组
*/
public static byte[] byte2hex(byte[] b)
{
int length = b.length;
byte[] b2 = new byte[length << 1];
int pos;
for (int i = 0; i < length; i++) {
pos = 2 * i;
b2[pos] = HEX_STRING_BYTE[(b[i] & 0xf0) >> 4];
b2[pos + 1] = HEX_STRING_BYTE[b[i] & 0x0f];
}
return b2;
}
/**
* 16进制字节数组转换为10进制字节数组
* <p>
* 两个16进制字节对应一个10进制字节，则将第一个16进制字节对应成16进制字符表中的位置(0~15)并向左移动4位，
* 再与第二个16进制字节对应成16进制字符表中的位置(0~15)进行或运算，则得到对应的10进制字节
*
* @param b 10进制字节数组
* @return 16进制字节数组
*/
public static byte[] hex2byte(byte[] b)
{
if (b.length % 2 != 0) {
throw new IllegalArgumentException("byte array length is not even!");
}
int length = b.length >> 1;
byte[] b2 = new byte[length];
int pos;
for (int i = 0; i < length; i++) {
pos = i << 1;
b2[i] = (byte) (HEX_CHAR.indexOf(b[pos]) << 4 | HEX_CHAR.indexOf(b[pos + 1]));
}
return b2;
}
/**
* 将16进制字节数组转成10进制字符串
*
* @param b 16进制字节数组
* @return 10进制字符串
*/
public static String hex2Str(byte[] b)
{
return new String(hex2byte(b));
}
/**
* 将10进制字节数组转成16进制字符串
*
* @param b 10进制字节数组
* @return 16进制字符串
*/
public static String byte2HexStr(byte[] b)
{
return Integer.toHexString(Integer.parseInt(new String(b)));
}
public static byte[] hexString2Bytes(String hex)
{
if ((hex == null) || (hex.equals(""))) {
return null;
} else if (hex.length() % 2 != 0) {
return null;
} else {
hex = hex.toUpperCase();
int len = hex.length() / 2;
byte[] b = new byte[len];
char[] hc = hex.toCharArray();
for (int i = 0; i < len; i++) {
int p = 2 * i;
b[i] = (byte) (charToByte(hc[p]) << 4 | charToByte(hc[p + 1]));
}
return b;
}
}
/*
* 字符转换为字节
*/
private static byte charToByte(char c)
{
return (byte) "0123456789ABCDEF".indexOf(c);
}
/**
* 字节数组转为普通字符串（ASCII对应的字符）
*
* @param bytearray byte[]
* @return String
*/
public static String bytetoString(byte[] bytearray)
{
String result = "";
char temp;
int length = bytearray.length;
for (int i = 0; i < length; i++) {
temp = (char) bytearray[i];
result += temp;
}
return result;
}
/**
* 数字字符串转ASCII码字符串
*
* @param content 字符串
* @return ASCII字符串
*/
public static String StringToAsciiString(String content)
{
String result = "";
int max = content.length();
for (int i = 0; i < max; i++) {
char c = content.charAt(i);
String b = Integer.toHexString(c);
result = result + b;
}
return result;
}
/**
* 十六进制字符串装十进制
*
* @param hex 十六进制字符串
* @return 十进制数值
*/
public static int hexStringToAlgorism(String hex)
{
hex = hex.toUpperCase();
int max = hex.length();
int result = 0;
for (int i = max; i > 0; i--) {
char c = hex.charAt(i - 1);
int algorism = 0;
if (c >= '0' && c <= '9') {
algorism = c - '0';
} else {
algorism = c - 55;
}
result += Math.pow(16, max - i) * algorism;
}
return result;
}
/**
* ASCII码字符串转数字字符串
*
* @param content ASCII字符串
* @return 字符串
*/
public static String AsciiStringToString(String content)
{
String result = "";
int length = content.length() / 2;
for (int i = 0; i < length; i++) {
String c = content.substring(i * 2, i * 2 + 2);
int a = hexStringToAlgorism(c);
char b = (char) a;
String d = String.valueOf(b);
result += d;
}
return result;
}
/***
* Ascii转16进制
* @param str
* @return
*/
public static String convertStringToHex(String str)
{
char[] chars = str.toCharArray();
StringBuffer hex = new StringBuffer();
for (int i = 0; i < chars.length; i++) {
hex.append(Integer.toHexString((byte) chars[i]));
}
return hex.toString();
}
/***
* 16进制转ASCII
* @param hex
* @return
*/
public static String convertHexToString(String hex)
{
StringBuilder sb = new StringBuilder();
StringBuilder temp = new StringBuilder();
//49204c6f7665204a617661 split into two characters 49, 20, 4c...
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);
}
return sb.toString();
}
/***
* byte[] z转int
* @param b
* @return
*/
public static int bytes2int(byte[] b)
{
int mask = 0xff;
int temp = 0;
int res = 0;
for (int i = 0; i < 4; i++) {
res <<= 8;
temp = b[i] & mask;
res |= temp;
}
return res;
}
public static byte[] int2bytes(int num)
{
byte[] b = new byte[4];
for (int i = 0; i < 4; i++) {
b[i] = (byte) (num >>> (24 - i * 8));
}
return b;
}
/**
* 中文转Unicode
*
* @param gbString
* @return
*/
public static String UnicodeEncoding(String gbString)
{ //gbString = "测试"
char[] utfBytes = gbString.toCharArray(); //utfBytes = [测, 试]
String unicodeBytes = "";
for (int byteIndex = 0; byteIndex < utfBytes.length; byteIndex++) {
String hexB = Integer.toHexString(utfBytes[byteIndex]); //转换为16进制整型字符串
if (hexB.length() <= 2) {
hexB = "00" + hexB;
}
unicodeBytes = unicodeBytes + "\\u" + hexB;
}
return unicodeBytes;
}
/**
* Unicode转中文
*/
public static String decodeUnicode(String dataStr)
{
int start = 0;
int end = 0;
StringBuffer buffer = new StringBuffer();
while (start > -1) {
end = dataStr.indexOf("\\u", start + 2);
String charStr = "";
if (end == -1) {
charStr = dataStr.substring(start + 2, dataStr.length());
} else {
charStr = dataStr.substring(start + 2, end);
}
char letter = (char) Integer.parseInt(charStr, 16); // 16进制parse整形字符串。
buffer.append(new Character(letter).toString());
start = end;
}
return buffer.toString();
}
/**
* gb2312编码
*/
public static String gb2312decode(String string) throws UnsupportedEncodingException
{
byte[] bytes = new byte[string.length() / 2];
for (int i = 0; i < bytes.length; i++) {
byte high = Byte.parseByte(string.substring(i * 2, i * 2 + 1), 16);
byte low = Byte.parseByte(string.substring(i * 2 + 1, i * 2 + 2), 16);
bytes[i] = (byte) (high << 4 | low);
}
return new String(bytes, "gb2312");
}
/**
* gb2312解码
*/
public static String gb2312eecode(String string) throws UnsupportedEncodingException
{
StringBuffer gbkStr = new StringBuffer();
byte[] gbkDecode = string.getBytes("gb2312");
for (byte b : gbkDecode) {
gbkStr.append(Integer.toHexString(b & 0xFF));
}
return gbkStr.toString();
}
/**
* 和校验
* SUM（cmd, Length, Data0…DataN）^0xFF
* */
public static byte getCheckSum(byte[] packBytes){
int checkSum = 0;
for (int i = 0; i < packBytes.length; i++) {
checkSum += packBytes[i];
}
checkSum &= 0xff;
return (byte)checkSum;
}
}
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