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int转byte方法：
public static byte[] intToByteArray(int i) {
byte[] result = new byte[4];
result[0] = (byte)((i >> 24) & 0xFF);
result[1] = (byte)((i >> 16) & 0xFF);
result[2] = (byte)((i >> 8) & 0xFF);
result[3] = (byte)(i & 0xFF);
return result;
}byte转int方法：
public static int byteArrayToInt(byte[] bytes) {
int value=0;
for(int i = 0; i < 4; i++) {
int shift= (3-i) * 8;
value +=(bytes[i] & 0xFF) << shift;
}
return value;
}