package cc.mrbird.febs.pay.util;
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import cc.mrbird.febs.common.exception.JPException;
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import cc.mrbird.febs.pay.model.CommonConst;
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/**
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* 16进制工具类
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* @author chenyf
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* @date 2018-12-15
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*/
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public class HEXUtil {
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private static final char[] DIGITS_LOWER =
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{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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private static final char[] DIGITS_UPPER =
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{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
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public static String encode(String str){
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try{
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return encode(str.getBytes(CommonConst.ENCODING_UTF_8), true);
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}catch (Exception e){
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throw new JPException("16进制转换失败", e);
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}
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}
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public static String encode(byte[] data, final boolean toUpperCase){
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return bytes2Hex(data, toUpperCase ? DIGITS_UPPER : DIGITS_LOWER);
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}
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public static String decode(String str){
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try{
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byte[] date = hex2Bytes(str);
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return new String(date, CommonConst.ENCODING_UTF_8);
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}catch (Exception e){
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throw new JPException("16进制转换失败", e);
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}
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}
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private static String bytes2Hex(final byte[] data, final char[] toDigits) {
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final int l = data.length;
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final char[] out = new char[l << 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; i < l; i++) {
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out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
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out[j++] = toDigits[0x0F & data[i]];
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}
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return new String(out);
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}
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private static byte[] hex2Bytes(final String data) throws Exception {
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final int len = data.length();
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if ((len & 0x01) != 0) {
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throw new Exception("Odd number of characters.");
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}
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final byte[] out = new byte[len >> 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; j < len; i++) {
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int f = toDigit(data.charAt(j), j) << 4;
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j++;
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f = f | toDigit(data.charAt(j), j);
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j++;
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out[i] = (byte) (f & 0xFF);
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}
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return out;
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}
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/**
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* 16转化为数字
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* @param ch 16进制
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* @param index 索引
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* @return 转化结果
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* @throws Exception 转化失败异常
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*/
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private static int toDigit(final char ch, final int index) throws Exception {
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final int digit = Character.digit(ch, 16);
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if (digit == -1) {
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throw new Exception("Illegal hexadecimal character " + ch + " at index " + index);
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}
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return digit;
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}
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}
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