Apache poi XLSX到XLS

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

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

public class XLSXtoXLSConverter {
    public static void main(String[] args) {
        String xlsxFilePath = "path/to/input.xlsx";
        String xlsFilePath = "path/to/output.xls";

        try (Workbook xlsxWorkbook = new XSSFWorkbook(new FileInputStream(xlsxFilePath));
             Workbook xlsWorkbook = new HSSFWorkbook()) {

            for (Sheet xlsxSheet : xlsxWorkbook) {
                Sheet xlsSheet = xlsWorkbook.createSheet(xlsxSheet.getSheetName());

                for (Row xlsxRow : xlsxSheet) {
                    Row xlsRow = xlsSheet.createRow(xlsxRow.getRowNum());
                    xlsRow.setHeight(xlsxRow.getHeight());
                    xlsRow.setZeroHeight(xlsxRow.getZeroHeight());

                    for (Cell xlsxCell : xlsxRow) {
                        Cell xlsCell = xlsRow.createCell(xlsxCell.getColumnIndex());
                        xlsCell.setCellStyle(xlsxCell.getCellStyle());

                        switch (xlsxCell.getCellType()) {
                            case STRING:
                                xlsCell.setCellValue(xlsxCell.getStringCellValue());
                                break;
                            case NUMERIC:
                                xlsCell.setCellValue(xlsxCell.getNumericCellValue());
                                break;
                            case BOOLEAN:
                                xlsCell.setCellValue(xlsxCell.getBooleanCellValue());
                                break;
                            case FORMULA:
                                xlsCell.setCellFormula(xlsxCell.getCellFormula());
                                break;
                            // Handle other cell types if needed
                        }
                    }
                }
            }

            try (FileOutputStream fileOutputStream = new FileOutputStream(xlsFilePath)) {
                xlsWorkbook.write(fileOutputStream);
            }

            System.out.println("XLSX to XLS conversion completed successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}