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package com.smart.utils; import java.nio.charset.Charset; import org.apache.commons.lang3.ArrayUtils; /** * * @Description: 字节数组转换工具类 * @author fun * @date 2019年3月27日 */ public class BytesUtils { public static final String GBK = "GBK"; public static final String UTF8 = "utf-8"; public static final char[] ascii = "0123456789ABCDEF".toCharArray(); private static char[] HEX_VOCABLE = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; /** * 将short整型数值转换为字节数组 * * @param data * @return */ public static byte[] getBytes(short data) { byte[] bytes = new byte[2]; bytes[0] = (byte) ((data & 0xff00) >> 8); bytes[1] = (byte) (data & 0xff); return bytes; } /** * 将字符转换为字节数组 * * @param data * @return */ public static byte[] getBytes(char data) { byte[] bytes = new byte[2]; bytes[0] = (byte) (data >> 8); bytes[1] = (byte) (data); return bytes; } /** * 将布尔值转换为字节数组 * * @param data * @return */ public static byte[] getBytes(boolean data) { byte[] bytes = new byte[1]; bytes[0] = (byte) (data ? 1 : 0); return bytes; } /** * 将整型数值转换为字节数组 * * @param data * @return */ public static byte[] getBytes(int data) { byte[] bytes = new byte[4]; bytes[0] = (byte) ((data & 0xff000000) >> 24); bytes[1] = (byte) ((data & 0xff0000) >> 16); bytes[2] = (byte) ((data & 0xff00) >> 8); bytes[3] = (byte) (data & 0xff); return bytes; } /** * 将long整型数值转换为字节数组 * * @param data * @return */ public static byte[] getBytes(long data) { byte[] bytes = new byte[8]; bytes[0] = (byte) ((data >> 56) & 0xff); bytes[1] = (byte) ((data >> 48) & 0xff); bytes[2] = (byte) ((data >> 40) & 0xff); bytes[3] = (byte) ((data >> 32) & 0xff); bytes[4] = (byte) ((data >> 24) & 0xff); bytes[5] = (byte) ((data >> 16) & 0xff); bytes[6] = (byte) ((data >> 8) & 0xff); bytes[7] = (byte) (data & 0xff); return bytes; } /** * 将float型数值转换为字节数组 * * @param data * @return */ public static byte[] getBytes(float data) { int intBits = Float.floatToIntBits(data); return getBytes(intBits); } /** * * @Title: getBytes * @Description: 将double型数值转换为字节数组 * @return byte[] * @author fun * @date 2019年3月27日 */ public static byte[] getBytes(double data) { long intBits = Double.doubleToLongBits(data); return getBytes(intBits); } /** * * @Title: getBytes * @Description: 将字符串按照charsetName编码格式的字节数组 * @return byte[] * @param data 字符串 * @param charsetName * @author fun * @date 2019年3月27日 */ public static byte[] getBytes(String data, String charsetName) { Charset charset = Charset.forName(charsetName); return data.getBytes(charset); } /** * * @Title: getBytes * @Description: 将字符串按照GBK编码格式的字节数组 * @return byte[] * @author fun * @date 2019年3月27日 */ public static byte[] getBytes(String data) { return getBytes(data, GBK); } /** * * @Title: getBoolean * @Description: 将字节数组第0字节转换为布尔值 * @return boolean * @author fun * @date 2019年3月27日 */ public static boolean getBoolean(byte[] bytes) { return bytes[0] == 1; } /** * * @Title: getBoolean * @Description: 将字节数组的第index字节转换为布尔值 * @return boolean * @author fun * @date 2019年3月27日 */ public static boolean getBoolean(byte[] bytes, int index) { return bytes[index] == 1; } /** * * @Title: getShort * @Description: 将字节数组前2字节转换为short整型数值 * @return short * @author fun * @date 2019年3月27日 */ public static short getShort(byte[] bytes) { return (short) ((0xff00 & (bytes[0] << 8)) | (0xff & bytes[1])); } /** * * @Title: getShort * @Description: 将字节数组从startIndex开始的2个字节转换为short整型数值 * @return short * @author fun * @date 2019年3月27日 */ public static short getShort(byte[] bytes, int startIndex) { return (short) ((0xff00 & (bytes[startIndex] << 8)) | (0xff & bytes[startIndex + 1])); } /** * * @Title: getChar * @Description: 将字节数组前2字节转换为字符 * @return char * @author fun * @date 2019年3月27日 */ public static char getChar(byte[] bytes) { return (char) ((0xff00 & (bytes[0] << 8)) | (0xff & bytes[1])); } /** * * @Title: getChar * @Description: 将字节数组从startIndex开始的2个字节转换为字符 * @return char * @author fun * @date 2019年3月27日 */ public static char getChar(byte[] bytes, int startIndex) { return (char) ((0xff00 & (bytes[startIndex] << 8)) | (0xff & bytes[startIndex + 1])); } /** * * @Title: getInt * @Description: 将字节数组前4字节转换为整型数值 * @return int * @author fun * @date 2019年3月27日 */ public static int getInt(byte[] bytes) { return (0xff000000 & (bytes[0] << 24) | (0xff0000 & (bytes[1] << 16)) | (0xff00 & (bytes[2] << 8)) | (0xff & bytes[3])); } /** * * @Title: getInt * @Description: 将字节数组从startIndex开始的4个字节转换为整型数值 * @return int * @author fun * @date 2019年3月27日 */ public static int getInt(byte[] bytes, int startIndex) { return (0xff000000 & (bytes[startIndex] << 24) | (0xff0000 & (bytes[startIndex + 1] << 16)) | (0xff00 & (bytes[startIndex + 2] << 8)) | (0xff & bytes[startIndex + 3])); } /** * 将字节数组前8字节转换为long整型数值 * * @param bytes * @return */ public static long getLong(byte[] bytes) { return (0xff00000000000000L & ((long) bytes[0] << 56) | (0xff000000000000L & ((long) bytes[1] << 48)) | (0xff0000000000L & ((long) bytes[2] << 40)) | (0xff00000000L & ((long) bytes[3] << 32)) | (0xff000000L & ((long) bytes[4] << 24)) | (0xff0000L & ((long) bytes[5] << 16)) | (0xff00L & ((long) bytes[6] << 8)) | (0xffL & (long) bytes[7])); } /** * 将字节数组从startIndex开始的8个字节转换为long整型数值 * * @param bytes * @param startIndex * @return */ public static long getLong(byte[] bytes, int startIndex) { return (0xff00000000000000L & ((long) bytes[startIndex] << 56) | (0xff000000000000L & ((long) bytes[startIndex + 1] << 48)) | (0xff0000000000L & ((long) bytes[startIndex + 2] << 40)) | (0xff00000000L & ((long) bytes[startIndex + 3] << 32)) | (0xff000000L & ((long) bytes[startIndex + 4] << 24)) | (0xff0000L & ((long) bytes[startIndex + 5] << 16)) | (0xff00L & ((long) bytes[startIndex + 6] << 8)) | (0xffL & (long) bytes[startIndex + 7])); } /** * 将字节数组前4字节转换为float型数值 * * @param bytes * @return */ public static float getFloat(byte[] bytes) { return Float.intBitsToFloat(getInt(bytes)); } /** * 将字节数组从startIndex开始的4个字节转换为float型数值 * * @param bytes * @param startIndex * @return */ public static float getFloat(byte[] bytes, int startIndex) { byte[] result = new byte[4]; System.arraycopy(bytes, startIndex, result, 0, 4); return Float.intBitsToFloat(getInt(result)); } /** * 将字节数组前8字节转换为double型数值 * * @param bytes * @return */ public static double getDouble(byte[] bytes) { long l = getLong(bytes); return Double.longBitsToDouble(l); } /** * 将字节数组从startIndex开始的8个字节转换为double型数值 * * @param bytes * @param startIndex * @return */ public static double getDouble(byte[] bytes, int startIndex) { byte[] result = new byte[8]; System.arraycopy(bytes, startIndex, result, 0, 8); long l = getLong(result); return Double.longBitsToDouble(l); } /** * 将char