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

public static void adjustExcelPageSetup(String inputPath, String tempPath) throws IOException {
    FileInputStream fis = new FileInputStream(inputPath);
    Workbook workbook = new XSSFWorkbook(fis);
    for (int i = 0; i < workbook.getNumberOfSheets(); i++) {
        Sheet sheet = workbook.getSheetAt(i);
        PrintSetup printSetup = sheet.getPrintSetup();
        printSetup.setLandscape(true); // 橫向打印
        sheet.setAutobreaks(true); // 自動分頁
        sheet.setFitToPage(true); // 啟用適應(yīng)頁面
        printSetup.setFitWidth((short) 1); // 一頁寬度
        printSetup.setFitHeight((short) 0); // 高度不限（0 = 自動）
        }
        FileOutputStream fos = new FileOutputStream(tempPath);
        workbook.write(fos);
        workbook.close();
        fis.close();
        fos.close();
}

public static void convertToPdf(String libreOfficePath, String inputPath, String outputDir) throws IOException, InterruptedException {
    List<String> command = Arrays.asList(
        libreOfficePath,
        “–headless”,
        “–norestore”,
        “–convert-to”, “pdf”,
        “–outdir”, outputDir,
        inputPath
        );
        ProcessBuilder pb = new ProcessBuilder(command);
        pb.inheritIO();
        Process process = pb.start();
        int exitCode = process.waitFor();

if (exitCode == 0) {
    System.out.println("轉(zhuǎn)換成功: " + inputPath);
    
} else {
    System.err.println("轉(zhuǎn)換失敗: " + inputPath);
    
}
    
}

printSetup.setFitWidth((short) 1);
printSetup.setFitHeight((short) 0);