package com.gk.firework.Domain.Utils;
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import org.apache.commons.lang3.StringUtils;
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public class HexUtil {
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/**
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* 将十六进制的字符串转换成字节数组
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*
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* @param hexString
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* @return
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*/
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public static byte[] hexStrToByteArrs(String hexString) {
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if (StringUtils.isEmpty(hexString)) {
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return null;
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}
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hexString = hexString.replaceAll(" ", "");
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int len = hexString.length();
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int index = 0;
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byte[] bytes = new byte[len / 2];
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while (index < len) {
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String sub = hexString.substring(index, index + 2);
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bytes[index / 2] = (byte) Integer.parseInt(sub, 16);
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index += 2;
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}
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return bytes;
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}
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/**
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* 数组转换成十六进制字符串
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* @return HexString
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*/
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public static final String bytesToHexString(byte[] bArray) {
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StringBuffer sb = new StringBuffer(bArray.length);
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String sTemp;
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for (int i = 0; i < bArray.length; i++) {
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sTemp = Integer.toHexString(0xFF & bArray[i]);
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if (sTemp.length() < 2)
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sb.append(0);
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sb.append(sTemp.toUpperCase());
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// 在这里故意追加一个逗号便于最后的区分
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sb.append(" ");
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}
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return sb.toString();
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}
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/**
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* 字节转换为浮点
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*
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* @param b 字节（至少4个字节）
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* @param index 开始位置
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* @return
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*/
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public static float byte2float(byte[] b, int index) {
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int l;
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l = b[index + 0];
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l &= 0xff;
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l |= ((long) b[index + 1] << 8);
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l &= 0xffff;
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l |= ((long) b[index + 2] << 16);
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l &= 0xffffff;
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l |= ((long) b[index + 3] << 24);
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return Float.intBitsToFloat(l);
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}
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/**四个字节的寄存器(十六进制)，两两转成十进制，传过来之后返回浮点数**/
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public static float GetFloat(int P1, int P2)
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{
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int intSign, intSignRest, intExponent, intExponentRest;
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float faResult, faDigit;
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intSign = P1 / 32768;
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intSignRest = P1 % 32768;
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intExponent = intSignRest / 128;
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intExponentRest = intSignRest % 128;
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faDigit = (float)(intExponentRest * 65536 + P2) / 8388608;
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faResult = (float)Math.pow(-1, intSign) * (float)Math.pow(2, intExponent - 127) * (faDigit + 1);
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return faResult;
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}
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}
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