[ZZ]byte[]到short、int、long的相互转换

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;

}