package com.ard.utils.other;
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import java.io.ByteArrayOutputStream;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteBuffer;
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import java.util.zip.CRC32;
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/**
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* @Description: 字节工具类
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* @ClassName: byteUtils
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* @Author: 刘苏义
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* @Date: 2023年07月03日15:18
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* @Version: 1.0
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**/
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public class ByteUtils {
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/**
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* byte数组转中文字符串
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*/
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public static String bytesToStringZh(byte[] bytes) {
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String zhStr = "";
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try {
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int position = ByteUtils.findIndexOfDoubleZero(bytes);
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if (position != -1) {
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byte[] result = new byte[position];
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System.arraycopy(bytes, 0, result, 0, position);
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zhStr = new String(result, "GBK");
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} else {
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zhStr = new String(bytes, "GBK");
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}
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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return zhStr;
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}
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/**
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* Byte字节转Hex
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*
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* @param b 字节
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* @return Hex
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*/
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public static String byteToHex(byte b) {
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String hexString = Integer.toHexString(b & 0xFF);
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//由于十六进制是由0~9、A~F来表示1~16，所以如果Byte转换成Hex后如果是<16,就会是一个字符（比如A=10），通常是使用两个字符来表示16进制位的,
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//假如一个字符的话，遇到字符串11，这到底是1个字节，还是1和1两个字节，容易混淆，如果是补0，那么1和1补充后就是0101，11就表示纯粹的11
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if (hexString.length() < 2) {
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hexString = new StringBuilder(String.valueOf(0)).append(hexString).toString();
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}
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return hexString.toUpperCase();
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}
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/**
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* byte数组转float
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*/
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public static float bytesToFloat(byte[] bytes) {
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ByteBuffer buffer = ByteBuffer.wrap(bytes);
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return buffer.getFloat();
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}
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/**
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* byte数组转整型
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*/
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public static int bytesToDecimal(byte[] byteArray) {
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int decimalValue = 0;
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for (int i = 0; i < byteArray.length; i++) {
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decimalValue = (decimalValue << 8) | (byteArray[i] & 0xFF);
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}
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return decimalValue;
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}
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/**
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* byte数组转Double
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*/
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public static double bytesToDouble(byte[] byteArray) {
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long longBits = 0;
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// 根据字节数组的长度和字节顺序，将字节数组转换为长整型
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for (int i = 0; i < byteArray.length; i++) {
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longBits |= (long) (byteArray[i] & 0xFF) << (8 * (byteArray.length - 1 - i));
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}
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// 使用Double.longBitsToDouble方法将长整型转换为Double类型
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return Double.longBitsToDouble(longBits);
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}
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/**
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* 大端转小端
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*/
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public static byte[] toLittleEndian(byte[] bigEndianBytes) {
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byte[] littleEndianBytes = new byte[bigEndianBytes.length];
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for (int i = 0; i < bigEndianBytes.length; i++) {
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int j = bigEndianBytes.length - i - 1;
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littleEndianBytes[i] = bigEndianBytes[j];
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}
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return littleEndianBytes;
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}
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/**
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* 小端转大端
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*/
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public static byte[] toBigEndian(byte[] littleEndianBytes) {
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byte[] bigEndianBytes = new byte[littleEndianBytes.length];
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for (int i = 0; i < littleEndianBytes.length; i++) {
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bigEndianBytes[i] = littleEndianBytes[littleEndianBytes.length - 1 - i];
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}
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return bigEndianBytes;
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}
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/**
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* int转byte数组
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*/
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public static byte[] decimalToBytes(int decimalValue) {
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ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES);
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buffer.putInt(decimalValue);
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return buffer.array();
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}
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/**
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* byte数组拼接
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*/
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public static byte[] appendArrays(byte[]... arrays) {
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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try {
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for (byte[] array : arrays) {
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outputStream.write(array);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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return outputStream.toByteArray();
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}
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/**
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* byte数组CRC32校验
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*/
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public static byte[] parseCrc32(byte[] bytes) {
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CRC32 crc32 = new CRC32();
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crc32.update(bytes);
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bytes = ByteUtils.decimalToBytes((int) crc32.getValue());
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bytes = ByteUtils.toBigEndian(bytes);
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// System.out.print("校验:"+DatatypeConverter.printHexBinary(bytes));//打印crc32的校验值
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return bytes;
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}
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/**
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* 去除包头包尾
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* 刘苏义
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* 2023/7/4 11:24
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*/
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public static byte[] removeHeaderAndFooter(byte[] data, int headerLength, int footerLength) {
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int payloadLength = data.length - headerLength - footerLength;
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byte[] payload = new byte[payloadLength];
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System.arraycopy(data, headerLength, payload, 0, payloadLength);
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return payload;
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}
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/**
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* 去除包头包尾crc校验
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* 刘苏义
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* 2023/7/4 11:24
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*/
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public static byte[] removeHeaderFooterAndCRC(byte[] data, int headerLength, int footerLength, int crcLength) {
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int payloadLength = data.length - headerLength - footerLength - crcLength;
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byte[] payload = new byte[payloadLength];
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System.arraycopy(data, headerLength, payload, 0, payloadLength);
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return payload;
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}
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/**
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* 获取后面的字节数组
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* 刘苏义
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* 2023/7/4 11:24
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*/
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public static byte[] getLastBytes(byte[] data, int count) {
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int startIndex = data.length - count;
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byte[] lastBytes = new byte[count];
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System.arraycopy(data, startIndex, lastBytes, 0, count);
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return lastBytes;
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}
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/**
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* 找到00的索引位置
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*/
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public static int findIndexOfDoubleZero(byte[] bytes) {
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for (int i = 0; i < bytes.length - 1; i++) {
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if (bytes[i] == 0x00) {
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return i;
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}
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}
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return -1;
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}
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}
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