Apache POI。计算生成的(通过模板) DOCX文档页面的高度

XWPFDocument document = new XWPFDocument();
CTSectPr sectPr = document.getDocument().getBody().addNewSectPr();
CTPageMar pageMar = sectPr.addNewPgMar();
pageMar.setLeft(BigInteger.valueOf(720)); // 设置左边距
pageMar.setRight(BigInteger.valueOf(720)); // 设置右边距
pageMar.setTop(BigInteger.valueOf(720)); // 设置上边距
pageMar.setBottom(BigInteger.valueOf(720)); // 设置下边距

XWPFHeaderFooterPolicy headerFooterPolicy = document.getHeaderFooterPolicy();
if (headerFooterPolicy == null) {
    headerFooterPolicy = document.createHeaderFooterPolicy();
}
XWPFHeader header = headerFooterPolicy.createHeader(XWPFHeaderFooterPolicy.DEFAULT);
XWPFFooter footer = headerFooterPolicy.createFooter(XWPFHeaderFooterPolicy.DEFAULT);

XWPFParagraph paragraph = document.createParagraph();
paragraph.setSpacingBetween(1.5); // 设置段落间距为1.5倍行高
XWPFRun run = paragraph.createRun();
run.setText("This is a sample paragraph.");
run.setFontSize(12); // 设置字体大小