byte[]到short、int、long的相互转换

来源：互联网发布：淘宝达人合作平台编辑：程序博客网时间：2024/05/18 22:40
public final static byte[] getBytes(short s, boolean asc) {    byte[] buf = new byte[2];    if (asc)        for (int i = buf.length - 1; i >= 0; i--)         {            buf[i] = (byte) (s & 0x00ff);          s >>= 8;        }    else        for (int i = 0; i < buf.length; i++)         {            buf[i] = (byte) (s & 0x00ff);          s >>= 8;        }    return buf;} public final static byte[] getBytes(int s, boolean asc) {    byte[] buf = new byte[4];    if (asc)      for (int i = buf.length - 1; i >= 0; i--)       {        buf[i] = (byte) (s & 0x000000ff);        s >>= 8;      }    else      for (int i = 0; i < buf.length; i++)      {        buf[i] = (byte) (s & 0x000000ff);        s >>= 8;      }    return buf;} public final static byte[] getBytes(long s, boolean asc) {    byte[] buf = new byte[8];    if (asc)      for (int i = buf.length - 1; i >= 0; i--)         {        buf[i] = (byte) (s & 0x00000000000000ff);        s >>= 8;      }    else      for (int i = 0; i < buf.length; i++)         {        buf[i] = (byte) (s & 0x00000000000000ff);        s >>= 8;      }    return buf;} public final static short getShort(byte[] buf, boolean asc) {    if (buf == null)     {      throw new IllegalArgumentException("byte array is null!");    }    if (buf.length > 2)     {      throw new IllegalArgumentException("byte array size > 2 !");    }    short r = 0;    if (asc)      for (int i = buf.length - 1; i >= 0; i--)         {        r <<= 8;        r |= (buf[i] & 0x00ff);      }    else      for (int i = 0; i < buf.length; i++)         {        r <<= 8;        r |= (buf[i] & 0x00ff);      }    return r;} public final static int getInt(byte[] buf, boolean asc) {    if (buf == null)     {      throw new IllegalArgumentException("byte array is null!");    }    if (buf.length > 4)     {      throw new IllegalArgumentException("byte array size > 4 !");    }    int r = 0;    if (asc)      for (int i = buf.length - 1; i >= 0; i--)         {        r <<= 8;        r |= (buf[i] & 0x000000ff);      }    else      for (int i = 0; i < buf.length; i++)         {        r <<= 8;        r |= (buf[i] & 0x000000ff);      }    return r;} public final static long getLong(byte[] buf, boolean asc) {    if (buf == null)     {      throw new IllegalArgumentException("byte array is null!");    }    if (buf.length > 8)     {      throw new IllegalArgumentException("byte array size > 8 !");    }    long r = 0;    if (asc)      for (int i = buf.length - 1; i >= 0; i--)         {        r <<= 8;        r |= (buf[i] & 0x00000000000000ff);      }    else      for (int i = 0; i < buf.length; i++)         {        r <<= 8;        r |= (buf[i] & 0x00000000000000ff);      }    return r;}
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