将 .xls 文件转换为 .xlsx 文件

问：

我有一个 .xls 格式的 Excel 文件，我想将其转换为或另存为具有相同内容的 .xlsx 文件。

我尝试了以下方法

package Test;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class xlstoxlsx {
    
    public static void convert(String xlsFilePath, String xlsxFilePath) throws IOException {
    
    FileInputStream xlsFile = new FileInputStream(xlsFilePath);
    HSSFWorkbook xlswb = new HSSFWorkbook(xlsFile);

    XSSFWorkbook xlsxwb = new XSSFWorkbook();

    for (int i = 0; i < xlswb.getNumberOfSheets(); i++) {
        xlsxwb.createSheet(xlswb.getSheetName(i));
    }
       
    FileOutputStream xlsxFile = new FileOutputStream(xlsxFilePath);
    xlswb.write(xlsxFile);

    xlswb.close();
    xlsxwb.close();
    xlsFile.close();
    xlsxFile.close();
    
    }
    
    public static void main (String args[]) throws IOException {
        
        xlstoxlsx.convert("C:\\Users\\user\\Desktop\\Test1.xls", "C:\\Users\\user\\Desktop\\Test2.xlsx");
        
    }

}

Exception in thread "main" org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:130)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:117)
    at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:285)
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:400)
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:381)
    at Test.xlstoxlsx.convert(xlstoxlsx.java:15)
    at Test.xlstoxlsx.main(xlstoxlsx.java:35)

我在这里做错了什么？有没有更好的方法可以将 .xls 转换为 .xlsx 格式？