HexUtils.java
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package com.diligrp.assistant.shared.security;
/**
* 字节数组与十六进制字符串转化工具类
*/
public class HexUtils {
private static final int GUARD_CHAR = 0x01;
private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
public static char[] encodeHex(byte[] data) {
return encodeHex(data, true);
}
public static char[] encodeHex(byte[] data, boolean toLowerCase) {
return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
public static String encodeHexStr(byte[] data) {
return encodeHexStr(data, true);
}
public static String encodeHexStr(byte[] data, boolean toLowerCase) {
return encodeHexStr(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
public static byte[] decodeHex(String data) {
return decodeHex(data.toCharArray());
}
public static byte[] decodeHex(char[] data) {
int len = data.length;
if ((len & GUARD_CHAR) != 0) {
throw new RuntimeException("Unknown char");
}
byte[] out = new byte[len >> 1];
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;
}
private static char[] encodeHex(byte[] data, char[] toDigits) {
int l = data.length;
char[] out = new char[l << 1];
for (int i = 0, j = 0; i < l; i++) {
out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
out[j++] = toDigits[0x0F & data[i]];
}
return out;
}
private static String encodeHexStr(byte[] data, char[] toDigits) {
return new String(encodeHex(data, toDigits));
}
private static int toDigit(char ch, int index) {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new RuntimeException("Invalid hex char " + ch + ", index at " + index);
}
return digit;
}
}