80 lines
2.1 KiB
Plaintext
80 lines
2.1 KiB
Plaintext
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package com.nationalelectric.greenH5.identityAuth.util.devon;
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/**
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* 16进制工具类。考虑使用{@link org.apache.commons.codec.binary.Hex}代替
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*
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* @author <a href="mailto:93785732@qq.com">ZhengDaHong@fzfx</a>
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* @since 2017/4/28 15:24
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*/
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public abstract class HexUtils {
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private final static String HEX_DIGITS_STRING = "0123456789ABCDEF";
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private final static char[] LOWERCASE_HEX_DIGITS = HEX_DIGITS_STRING.toLowerCase().toCharArray();
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private final static char[] UPPERCASE_HEX_DIGITS = HEX_DIGITS_STRING.toCharArray();
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public static String encodeWithLowerCase(byte[] data) {
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return encode(data, true);
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}
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public static String encodeWithUpperCase(byte[] data) {
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return encode(data, false);
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}
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/**
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* 转换字节数组为16进制字串
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*
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* @param data 字节数组
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* @return 16进制字串
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*/
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public static String encode(byte[] data, boolean useLowercase) {
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StringBuilder result = new StringBuilder();
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for (int i = 0; i < data.length; i++) {
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result.append(encode(data[i], useLowercase));
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}
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return result.toString();
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}
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/**
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*
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* @param hexString 必须以两位16进制为一个单位
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* @return
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*/
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public static byte[] decode(String hexString) {
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if (hexString == null || hexString.equals("")) {
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return null;
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}
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hexString = hexString.toUpperCase();
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int length = hexString.length() / 2;
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char[] hexChars = hexString.toCharArray();
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byte[] d = new byte[length];
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for (int i = 0; i < length; i++) {
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int pos = i * 2;
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d[i] = (byte) (decode(hexChars[pos]) << 4 | decode(hexChars[pos + 1]));
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}
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return d;
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}
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//---------------------------------------------------------------------
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//
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//---------------------------------------------------------------------
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private static byte decode(char c) {
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return (byte) HEX_DIGITS_STRING.indexOf(c);
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}
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private static String encode(byte b, boolean useLowercase) {
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char[] hexDigitsToUse = useLowercase ? LOWERCASE_HEX_DIGITS : UPPERCASE_HEX_DIGITS;
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int i = b;
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if (i < 0)
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i = 256 + i;
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int d1 = i / 16;
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int d2 = i % 16;
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return String.valueOf(hexDigitsToUse[d1]) + hexDigitsToUse[d2];
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}
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}
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