package com.ruoyi.fuzhou.utils.watermodbus;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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public class FloatInverseWaterParser {
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public static void main(String[] args) {
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// 示例输入：8位十六进制字符串（FloatInverse格式）
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String hexString = "0005"; // 反转后的字节顺序，表示浮点数 3.14
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byte[] bytes = FloatInverseWaterParser.hexStringToByteArray(hexString);
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byte[] reversedBytes = FloatInverseWaterParser.reverseByteArray(bytes);
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float floatValue = FloatInverseWaterParser.parseAsFloat(reversedBytes, ByteOrder.LITTLE_ENDIAN);
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System.out.println("3值为" + floatValue);
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}
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/**
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* 将十六进制字符串转换为字节数组
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*/
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public static byte[] hexStringToByteArray(String s) {
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int len = s.length();
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if (len % 2 != 0) {
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throw new IllegalArgumentException("十六进制字符串长度必须为偶数。");
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}
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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int high = Character.digit(s.charAt(i), 16) << 4;
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int low = Character.digit(s.charAt(i + 1), 16);
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if (high == -1 || low == -1) {
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throw new IllegalArgumentException("包含无效的十六进制字符: " + s);
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}
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data[i / 2] = (byte) (high + low);
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}
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return data;
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}
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/**
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* 反转字节数组
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*/
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public static byte[] reverseByteArray(byte[] bytes) {
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byte[] reversed = new byte[bytes.length];
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for (int i = 0; i < bytes.length; i++) {
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reversed[i] = bytes[bytes.length - 1 - i];
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}
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return reversed;
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}
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/**
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* 将字节数组解析为浮点数
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*
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* @param bytes 字节数组（必须为4字节）
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* @param order 字节顺序（大端或小端）
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*/
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public static float parseAsFloat(byte[] bytes, ByteOrder order) {
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if (bytes.length != 4) {
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throw new IllegalArgumentException("字节数组长度必须为4字节。");
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}
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ByteBuffer buffer = ByteBuffer.wrap(bytes).order(order);
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return buffer.getFloat();
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}
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}
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