public byte[] intToByte(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;}

  public int byteToInt(byte[] arr) {int i0 = (int) ((arr[0] & 0xff) << 0 * 8);int i1 = (int) ((arr[1] & 0xff) << 1 * 8);int i2 = (int) ((arr[2] & 0xff) << 2 * 8);int i3 = (int) ((arr[3] & 0xff) << 3 * 8);return i0 + i1 + i2 + i3;}