我需要一些方法来将BigInt转换为字节数组，就像在swift中的java

import java.math.BigInteger;

public class BigIntToByteArray {
    public static void main(String[] args) {
        BigInteger bigInt = new BigInteger("1234567890");
        byte[] byteArray = bigInt.toByteArray();
        
        // 打印字节数组内容
        for (byte b : byteArray) {
            System.out.print(b + " ");
        }
    }
}

import java.math.BigInteger;

public class BigIntToByteArray {
    public static void main(String[] args) {
        BigInteger bigInt = new BigInteger("1234567890");
        String hexString = bigInt.toString(16);
        
        // 确定字节数组长度
        int byteArrayLength = (hexString.length() + 1) / 2;
        byte[] byteArray = new byte[byteArrayLength];
        
        // 将十六进制字符串转换为字节数组
        for (int i = 0; i < hexString.length(); i += 2) {
            String hexByte = hexString.substring(i, Math.min(i + 2, hexString.length()));
            byteArray[i / 2] = (byte) Integer.parseInt(hexByte, 16);
        }
        
        // 打印字节数组内容
        for (byte b : byteArray) {
            System.out.print(b + " ");
        }
    }
}