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@ -0,0 +1,420 @@
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package com.sarnath.modbusserver.dtuutils;
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import java.nio.ByteOrder;
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import java.nio.charset.Charset;
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/**
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* 数字转字节数组工具类
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*/
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public class BitConverter {
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/**
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* 以字节数组的形式返回指定的布尔值
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* @param data 一个布尔值
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* @return 长度为 1 的字节数组
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*/
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public static byte[] getBytes(boolean data) {
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byte[] bytes = new byte[1];
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bytes[0] = (byte) (data ? 1 : 0);
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return bytes;
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}
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/**
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* 以字节数组的形式返回指定的 16 位有符号整数值
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* @param data 要转换的数字
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* @return 长度为 2 的字节数组
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*/
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public static byte[] getBytes(short data) {
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byte[] bytes = new byte[2];
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if (isLittleEndian()) {
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bytes[0] = (byte) (data & 0xff);
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bytes[1] = (byte) ((data & 0xff00) >> 8);
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} else {
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bytes[1] = (byte) (data & 0xff);
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bytes[0] = (byte) ((data & 0xff00) >> 8);
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}
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return bytes;
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}
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/**
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* 以字节数组的形式返回指定的 Unicode 字符值
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* @param data 要转换的字符
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* @return 长度为 2 的字节数组
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*/
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public static byte[] getBytes(char data) {
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byte[] bytes = new byte[2];
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if (isLittleEndian()) {
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bytes[0] = (byte) (data);
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bytes[1] = (byte) (data >> 8);
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} else {
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bytes[1] = (byte) (data);
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bytes[0] = (byte) (data >> 8);
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}
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return bytes;
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}
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/**
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* 以字节数组的形式返回指定的 32 位有符号整数值
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* @param data 要转换的数字
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* @return 长度为 4 的字节数组
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*/
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public static byte[] getBytes(int data) {
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byte[] bytes = new byte[4];
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if (isLittleEndian()) {
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bytes[0] = (byte) (data & 0xff);
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bytes[1] = (byte) ((data & 0xff00) >> 8);
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bytes[2] = (byte) ((data & 0xff0000) >> 16);
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bytes[3] = (byte) ((data & 0xff000000) >> 24);
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} else {
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bytes[3] = (byte) (data & 0xff);
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bytes[2] = (byte) ((data & 0xff00) >> 8);
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bytes[1] = (byte) ((data & 0xff0000) >> 16);
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bytes[0] = (byte) ((data & 0xff000000) >> 24);
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}
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return bytes;
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}
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/**
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* 以字节数组的形式返回指定的 64 位有符号整数值
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* @param data 要转换的数字
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* @return 长度为 8 的字节数组
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*/
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public static byte[] getBytes(long data) {
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byte[] bytes = new byte[8];
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if (isLittleEndian()) {
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bytes[0] = (byte) (data & 0xff);
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bytes[1] = (byte) ((data >> 8) & 0xff);
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bytes[2] = (byte) ((data >> 16) & 0xff);
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bytes[3] = (byte) ((data >> 24) & 0xff);
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bytes[4] = (byte) ((data >> 32) & 0xff);
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bytes[5] = (byte) ((data >> 40) & 0xff);
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bytes[6] = (byte) ((data >> 48) & 0xff);
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bytes[7] = (byte) ((data >> 56) & 0xff);
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} else {
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bytes[7] = (byte) (data & 0xff);
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bytes[6] = (byte) ((data >> 8) & 0xff);
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bytes[5] = (byte) ((data >> 16) & 0xff);
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bytes[4] = (byte) ((data >> 24) & 0xff);
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bytes[3] = (byte) ((data >> 32) & 0xff);
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bytes[2] = (byte) ((data >> 40) & 0xff);
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bytes[1] = (byte) ((data >> 48) & 0xff);
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bytes[0] = (byte) ((data >> 56) & 0xff);
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}
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return bytes;
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}
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/**
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* 以字节数组的形式返回指定的单精度浮点值
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* @param data 要转换的数字
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* @return 长度为 4 的字节数组
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*/
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public static byte[] getBytes(float data) {
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return getBytes(Float.floatToIntBits(data));
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}
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/**
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* 以字节数组的形式返回指定的双精度浮点值
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* @param data 要转换的数字
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* @return 长度为 8 的字节数组
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*/
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public static byte[] getBytes(double data) {
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return getBytes(Double.doubleToLongBits(data));
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}
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/**
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* 将指定字符串中的所有字符编码为一个字节序列
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* @param data 包含要编码的字符的字符串
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* @return 一个字节数组,包含对指定的字符集进行编码的结果
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*/
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public static byte[] getBytes(String data) {
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return data.getBytes(Charset.forName("UTF-8"));
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}
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/**
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* 将指定字符串中的所有字符编码为一个字节序列
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* @param data 包含要编码的字符的字符串
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* @param charsetName 字符集编码
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* @return 一个字节数组,包含对指定的字符集进行编码的结果
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*/
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public static byte[] getBytes(String data, String charsetName) {
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return data.getBytes(Charset.forName(charsetName));
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}
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/**
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* 返回由字节数组转换来的布尔值
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* @param bytes 字节数组
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* @return 布尔值
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*/
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public static boolean toBoolean(byte[] bytes) {
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return bytes[0] == 0 ? false : true;
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}
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/**
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* 返回由字节数组中的指定的一个字节转换来的布尔值
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 布尔值
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*/
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public static boolean toBoolean(byte[] bytes, int startIndex) {
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return toBoolean(copyFrom(bytes, startIndex, 1));
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}
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/**
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* 返回由字节数组转换来的 16 位有符号整数
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* @param bytes 字节数组
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* @return 由两个字节构成的 16 位有符号整数
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*/
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public static short toShort(byte[] bytes) {
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if (isLittleEndian()) {
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return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
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} else {
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return (short) ((0xff & bytes[1]) | (0xff00 & (bytes[0] << 8)));
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}
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}
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/**
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* 无符号short整数转换为2字节的byte数组
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*
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* @param s
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* short整数
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* @return byte数组
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*/
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public static byte[] unsignedShortToByte2(int s) {
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byte[] targets = new byte[2];
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targets[0] = (byte) (s >> 8 & 0xFF);
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targets[1] = (byte) (s & 0xFF);
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return targets;
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}
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/**
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* byte数组转换为无符号short整数
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*
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* @param bytes
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* byte数组
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* @return short整数
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*/
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public static int byte2ToUnsignedShort(byte[] bytes) {
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return byte2ToUnsignedShort(bytes, 0);
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}
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/**
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* byte数组转换为无符号short整数
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*
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* @param bytes
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* byte数组
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* @param off
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* 开始位置
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* @return short整数
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*/
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public static int byte2ToUnsignedShort(byte[] bytes, int off) {
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int high = bytes[off];
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int low = bytes[off + 1];
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return (high << 8 & 0xFF00) | (low & 0xFF);
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}
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/**
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* 返回由字节数组中的指定的两个字节转换来的 16 位有符号整数
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由两个字节构成的 16 位有符号整数
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*/
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public static short toShort(byte[] bytes, int startIndex) {
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return toShort(copyFrom(bytes, startIndex, 2));
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}
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/**
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* 返回由字节数组转换来的 Unicode 字符
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* @param bytes 字节数组
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* @return 由两个字节构成的字符
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*/
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public static char toChar(byte[] bytes) {
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if (isLittleEndian()) {
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return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
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} else {
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return (char) ((0xff & bytes[1]) | (0xff00 & (bytes[0] << 8)));
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}
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}
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/**
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* 返回由字节数组中的指定的两个字节转换来的 Unicode 字符
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由两个字节构成的字符
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*/
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public static char toChar(byte[] bytes, int startIndex) {
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return toChar(copyFrom(bytes, startIndex, 2));
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}
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/**
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* 返回由字节数组转换来的 32 位有符号整数
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* @param bytes 字节数组
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* @return 由四个字节构成的 32 位有符号整数
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*/
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public static int toInt(byte[] bytes) {
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if (isLittleEndian()) {
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return (0xff & bytes[0])
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| (0xff00 & (bytes[1] << 8))
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| (0xff0000 & (bytes[2] << 16))
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| (0xff000000 & (bytes[3] << 24));
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} else {
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return (0xff & bytes[3])
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| (0xff00 & (bytes[2] << 8))
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| (0xff0000 & (bytes[1] << 16))
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| (0xff000000 & (bytes[0] << 24));
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}
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}
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/**
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* 返回由字节数组中的指定的四个字节转换来的 32 位有符号整数
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由四个字节构成的 32 位有符号整数
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*/
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public static int toInt(byte[] bytes, int startIndex) {
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return toInt(copyFrom(bytes, startIndex, 4));
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}
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/**
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* 返回由字节数组转换来的 64 位有符号整数
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* @param bytes 字节数组
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* @return 由八个字节构成的 64 位有符号整数
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*/
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public static long toLong(byte[] bytes) {
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if (isLittleEndian()) {
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return (0xffL & (long) bytes[0])
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| (0xff00L & ((long) bytes[1] << 8))
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| (0xff0000L & ((long) bytes[2] << 16))
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| (0xff000000L & ((long) bytes[3] << 24))
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| (0xff00000000L & ((long) bytes[4] << 32))
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| (0xff0000000000L & ((long) bytes[5] << 40))
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| (0xff000000000000L & ((long) bytes[6] << 48))
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| (0xff00000000000000L & ((long) bytes[7] << 56));
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} else {
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return (0xffL & (long) bytes[7])
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| (0xff00L & ((long) bytes[6] << 8))
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| (0xff0000L & ((long) bytes[5] << 16))
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| (0xff000000L & ((long) bytes[4] << 24))
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| (0xff00000000L & ((long) bytes[3] << 32))
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| (0xff0000000000L & ((long) bytes[2] << 40))
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| (0xff000000000000L & ((long) bytes[1] << 48))
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| (0xff00000000000000L & ((long) bytes[0] << 56));
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}
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}
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/**
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* 返回由字节数组中的指定的八个字节转换来的 64 位有符号整数
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由八个字节构成的 64 位有符号整数
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*/
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public static long toLong(byte[] bytes, int startIndex) {
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return toLong(copyFrom(bytes, startIndex, 8));
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}
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/**
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* 返回由字节数组转换来的单精度浮点数
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* @param bytes 字节数组
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* @return 由四个字节构成的单精度浮点数
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*/
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public static float toFloat(byte[] bytes) {
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return Float.intBitsToFloat(toInt(bytes));
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}
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/**
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* 返回由字节数组中的指定的四个字节转换来的单精度浮点数
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由四个字节构成的单精度浮点数
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*/
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public static float toFloat(byte[] bytes, int startIndex) {
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return Float.intBitsToFloat(toInt(copyFrom(bytes, startIndex, 4)));
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}
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/**
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* 返回由字节数组转换来的双精度浮点数
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* @param bytes 字节数组
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* @return 由八个字节构成的双精度浮点数
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*/
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public static double toDouble(byte[] bytes) {
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return Double.longBitsToDouble(toLong(bytes));
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}
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/**
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* 返回由字节数组中的指定的八个字节转换来的双精度浮点数
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* @param bytes 字节数组
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* @param startIndex 起始下标
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* @return 由八个字节构成的双精度浮点数
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*/
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public static double toDouble(byte[] bytes, int startIndex) {
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return Double.longBitsToDouble(toLong(copyFrom(bytes, startIndex, 8)));
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}
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/**
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* 返回由字节数组转换来的字符串
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* @param bytes 字节数组
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* @return 字符串
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*/
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public static String toString(byte[] bytes) {
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return new String(bytes, Charset.forName("UTF-8"));
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}
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/**
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* 返回由字节数组转换来的字符串
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* @param bytes 字节数组
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* @param charsetName 字符集编码
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* @return 字符串
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*/
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public static String toString(byte[] bytes, String charsetName) {
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return new String(bytes, Charset.forName(charsetName));
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}
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/**
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* 以字符串表示形式返回字节数组的内容
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* @param bytes 字节数组
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* @return 字符串形式的 <tt>bytes</tt>
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*/
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public static String toHexString(byte[] bytes) {
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if (bytes == null)
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return "null";
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int iMax = bytes.length - 1;
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if (iMax == -1)
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return "[]";
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StringBuilder b = new StringBuilder();
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b.append('[');
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for (int i = 0; ; i++) {
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b.append(String.format("%02x", bytes[i] & 0xFF));
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if (i == iMax)
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return b.append(']').toString();
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b.append(", ");
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}
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}
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// --------------------------------------------------------------------------------------------
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/**
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* 数组拷贝。
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* @param src 字节数组。
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* @param off 起始下标。
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* @param len 拷贝长度。
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* @return 指定长度的字节数组。
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*/
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public static byte[] copyFrom(byte[] src, int off, int len) {
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// return Arrays.copyOfRange(src, off, off + len);
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byte[] bits = new byte[len];
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for (int i = off, j = 0; i < src.length && j < len; i++, j++) {
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bits[j] = src[i];
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}
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return bits;
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}
|
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/**
|
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|
|
* 判断 CPU Endian 是否为 Little
|
|
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|
|
* @return 判断结果
|
|
|
|
|
*/
|
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|
|
private static boolean isLittleEndian() {
|
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|
|
return ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN;
|
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|
|
}
|
|
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|
|
}
|
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