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com.github.deansquirrel.tools.common.Hex Maven / Gradle / Ivy
package com.github.deansquirrel.tools.common;
/***
* Hex工具类
* @author [email protected]
*
*/
public class Hex {
private Hex() {}
/**
* 用于建立十六进制字符的输出的小写字符数组
*/
private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
/**
* 用于建立十六进制字符的输出的大写字符数组
*/
private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
/**
* 字符串转换成十六进制字符串
* @param str 待转换的ASCII字符串
* @return 每个Byte之间空格分隔，如: [61 6C 6B]
*/
public static String str2HexStr(String str) {
char[] chars = "0123456789ABCDEF".toCharArray();
StringBuilder sb = new StringBuilder("");
byte[] bs = str.getBytes();
int bit;
for (int i = 0; i < bs.length; i++) {
bit = (bs[i] & 0x0f0) >> 4;
sb.append(chars[bit]);
bit = bs[i] & 0x0f;
sb.append(chars[bit]);
sb.append(' ');
}
return sb.toString().trim();
}
/**
* 十六进制转换字符串
* @param hexStr Byte字符串(Byte之间无分隔符 如:[616C6B])
* @return 对应的字符串
*/
public static String hexStr2Str(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);
}
return new String(bytes);
}
/**
* bytes转换成十六进制字符串
* @param b byte数组
* @return 每个Byte值之间空格分隔
*/
public static String byte2HexStr(byte[] b) {
String stmp = "";
StringBuilder sb = new StringBuilder("");
for (int n = 0; n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0xFF);
sb.append((stmp.length() == 1) ? "0" + stmp : stmp);
// sb.append(" ");
}
return sb.toString().toUpperCase().trim();
}
/**
* bytes字符串转换为Byte值
* @param src Byte字符串，每个Byte之间没有分隔符
* @return 转换结果
*/
public static byte[] hexStr2Bytes(String src) {
int m = 0, n = 0;
int l = src.length() / 2;
byte[] ret = new byte[l];
for (int i = 0; i < l; i++) {
m = i * 2 + 1;
n = m + 1;
ret[i] = Byte.decode("0x" + src.substring(i * 2, m) + src.substring(m, n));
}
return ret;
}
/**
* tring的字符串转换成unicode的String
* @param strText strText 全角字符串
* @return 每个unicode之间无分隔符
* @throws Exception Exception
*/
public static String strToUnicode(String strText) throws Exception {
char c;
StringBuilder str = new StringBuilder();
int intAsc;
String strHex;
for (int i = 0; i < strText.length(); i++) {
c = strText.charAt(i);
intAsc = (int) c;
strHex = Integer.toHexString(intAsc);
if (intAsc > 128)
str.append("\\u" + strHex);
else
// 低位在前面补00
str.append("\\u00" + strHex);
}
return str.toString();
}
/**
* unicode的String转换成String的字符串
* @param hex 16进制值字符串 （一个unicode为2byte）
* @return 全角字符串
*/
public static String unicodeToString(String hex) {
int t = hex.length() / 6;
StringBuilder str = new StringBuilder();
for (int i = 0; i < t; i++) {
String s = hex.substring(i * 6, (i + 1) * 6);
// 高位需要补上00再转
String s1 = s.substring(2, 4) + "00";
// 低位直接转
String s2 = s.substring(4);
// 将16进制的string转为int
int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16);
// 将int转换为字符
char[] chars = Character.toChars(n);
str.append(new String(chars));
}
return str.toString();
}
/**
* 将字节数组转换为十六进制字符数组
* @param data byte[]
* @return 十六进制char[]
*/
public static char[] encodeHex(byte[] data) {
return encodeHex(data, true);
}
/**
* 将字节数组转换为十六进制字符数组
* @param data byte[]
* @param toLowerCase true 传换成小写格式 ， false 传换成大写格式
* @return 十六进制char[]
*/
public static char[] encodeHex(byte[] data, boolean toLowerCase) {
return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 将字节数组转换为十六进制字符数组
* @param data byte[]
* @param toDigits 用于控制输出的char[]
* @return 十六进制char[]
*/
protected static char[] encodeHex(byte[] data, char[] toDigits) {
int l = data.length;
char[] out = new char[l << 1];
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
out[j++] = toDigits[0x0F & data[i]];
}
return out;
}
/**
* 将字节数组转换为十六进制字符串
* @param data byte[]
* @return 十六进制String
*/
public static String encodeHexStr(byte[] data) {
return encodeHexStr(data, true);
}
/**
* 将字节数组转换为十六进制字符串
* @param data byte[]
* @param toLowerCase true 传换成小写格式 ， false 传换成大写格式
* @return 十六进制String
*/
public static String encodeHexStr(byte[] data, boolean toLowerCase) {
return encodeHexStr(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 将字节数组转换为十六进制字符串
* @param data byte[]
* @param toDigits 用于控制输出的char[]
* @return 十六进制String
*/
protected static String encodeHexStr(byte[] data, char[] toDigits) {
return new String(encodeHex(data, toDigits));
}
/**
* 将十六进制字符数组转换为字节数组
* @param data 十六进制char[]
* @return 转换结果
* @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
*/
public static byte[] decodeHex(char[] data) {
int len = data.length;
if ((len & 0x01) != 0) {
throw new RuntimeException("Odd number of characters.");
}
byte[] out = new byte[len >> 1];
// two characters form the hex value.
for (int i = 0, j = 0; j < len; i++) {
int f = toDigit(data[j], j) << 4;
j++;
f = f | toDigit(data[j], j);
j++;
out[i] = (byte) (f & 0xFF);
}
return out;
}
/**
* 将十六进制字符转换成一个整数
* @param ch 十六进制char
* @param index 十六进制字符在字符数组中的位置
* @return 一个整数
* @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常
*/
protected static int toDigit(char ch, int index) {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new RuntimeException("Illegal hexadecimal character " + ch
+ " at index " + index);
}
return digit;
}
}
