byte[] int 互转 随笔

/**
* int 转换成指定长度的byte数组
* 
* @param iSource
*            待转换int 数据
* @param iArrayLen
*            指定的byte 数组长度
* @return byte 数组
*/
public static byte[] intToByteArray(int iSource, int iArrayLen) {
byte[] bLocalArr = new byte[iArrayLen];
for (int i = 0; (i < 4) && (i < iArrayLen); i++) {
bLocalArr[i] = (byte) (iSource >> 8 * (iArrayLen - 1 - i) & 0xFF);
}
return bLocalArr;

}

                ByteBuffer mBufferReceive = ByteBuffer.wrap(data);
if(mBufferReceive.position()!=0) mBufferReceive.flip();
int id = mBufferReceive.get();//获得1个字节
int cmd = mBufferReceive.get()//;获得第二个字节
int length = mBufferReceive.get();//获得第3个字节

               。。。。。。。。。