用iTextpdf删除java中的pdf页面

PdfReader reader = new PdfReader("path/to/input.pdf");

PdfWriter writer = new PdfWriter("path/to/output.pdf");
PdfDocument document = new PdfDocument(reader, writer);
document.addPageEvent(new PdfPageEventHelper() {
    @Override
    public void onStartPage(PdfWriter writer, PdfDocument document) {
        // 在写入每个页面之前执行操作
        int currentPageNumber = document.getPageNumber(writer.getCurrentPage());
        if (currentPageNumber != 2) {
            // 删除除第二页以外的所有页面
            document.getPage(currentPageNumber).delete();
        }
    }
});

document.close();