当我用java从文件夹下载Excel时，我得到这样的错误：“.xls文件的格式和扩展名不匹配。文件可能已损坏”。

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

public class ExcelDownloader {
    public static void main(String[] args) {
        String fileUrl = "https://example.com/path/to/excel.xls";
        String savePath = "C:\\path\\to\\save\\excel.xls";

        try {
            URL url = new URL(fileUrl);
            InputStream inputStream = new BufferedInputStream(url.openStream());
            FileOutputStream fileOutputStream = new FileOutputStream(savePath);

            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer, 0, 1024)) != -1) {
                fileOutputStream.write(buffer, 0, bytesRead);
            }

            fileOutputStream.close();
            inputStream.close();

            System.out.println("Excel downloaded successfully.");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("Error occurred while downloading Excel.");
        }
    }
}