byte数组和short数组转换
public short bytesToShort(byte[] bytes) { return ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN).getShort(); } public byte[] shortToBytes(short value) { return ByteBuffer.allocate(2).order(ByteOrder.LITTLE_ENDIAN).putShort(value).array(); }
public short[] byteArray2ShortArray(byte[] data, int items) { short[] retVal = new short[items]; for (int i = 0; i < retVal.length; i++) retVal[i] = (short) ((data[i * 2] & 0xff) | (data[i * 2 + 1] & 0xff) << 8); return retVal; }
public class DataTypeChangeHelper { /** * 将一个单字节的byte转换成32位的int * * @param b * byte * @return convert result */ public static int unsignedByteToInt(byte b) { return (int) b & 0xFF; } /** * 将一个单字节的Byte转换成十六进制的数 * * @param b * byte * @return convert result */ public static String byteToHex(byte b) { int i = b & 0xFF; return Integer.toHexString(i); } /** * 将一个4byte的数组转换成32位的int * * @param buf * bytes buffer * @param byte[]中开始转换的位置 * @return convert result */ public static long unsigned4BytesToInt(byte[] buf, int pos) { int firstByte = 0; int secondByte = 0; int thirdByte = 0; int fourthByte = 0; int index = pos; firstByte = (0x000000FF & ((int) buf[index])); secondByte = (0x000000FF & ((int) buf[index + 1])); thirdByte = (0x000000FF & ((int) buf[index + 2])); fourthByte = (0x000000FF & ((int) buf[index + 3])); index = index + 4; return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL; } /** * 将16位的short转换成byte数组 * * @param s * short * @return byte[] 长度为2 * */ public static byte[] shortToByteArray(short s) { byte[] targets = new byte[2]; for (int i = 0; i < 2; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /** * 将32位整数转换成长度为4的byte数组 * * @param s * int * @return byte[] * */ public static byte[] intToByteArray(int s) { byte[] targets = new byte[2]; for (int i = 0; i < 4; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /** * long to byte[] * * @param s * long * @return byte[] * */ public static byte[] longToByteArray(long s) { byte[] targets = new byte[2]; for (int i = 0; i < 8; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /**32位int转byte[]*/ public static byte[] int2byte(int res) { byte[] targets = new byte[4]; targets[0] = (byte) (res & 0xff);// 最低位 targets[1] = (byte) ((res >> 8) & 0xff);// 次低位 targets[2] = (byte) ((res >> 16) & 0xff);// 次高位 targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。 return targets; } /** * 将长度为2的byte数组转换为16位int * * @param res * byte[] * @return int * */ public static int byte2int(byte[] res) { // res = InversionByte(res); // 一个byte数据左移24位变成0x??000000,再右移8位变成0x00??0000 int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00); // | 表示安位或 return targets; } }
时间: 2024-10-15 13:57:55