private static final int COMMAND_NO_READ_RESOURCE = 0x0224;

HexUtil.intToBytes(COMMAND_NO_READ_RESOURCE, 2)

/**
 * Transform integer array to byte
 * @param source
*            the source need to be transformed
 * @param length
*            the length of byte array
 * @return b the length of byte array b
 
 */
public static byte[] intToBytes(int source, int length) {
    byte[] b = new byte[length];
    for (int i = 0; i < length; i++) {
        b[i] = (byte) (source >> 8 * (length - i - 1) & 0xFF);
}
    return b;
}

(source >> 8 * (length - i - 1) & 0xFF);

參考連結如下：

https://my.oschina.net/u/169390/blog/97495

http://blog.csdn.net/sunnyfans/article/details/8286906