POI 生成 word 增加页码

您可以在生成 Word 文档时，在页脚处插入页码。以下是示例代码：

// 创建一个页脚段落
XWPFParagraph footerParagraph = doc.createParagraph();
footerParagraph.setAlignment(ParagraphAlignment.CENTER);

// 在页脚段落中插入页码
XWPFRun footerRun = footerParagraph.createRun();
footerRun.setText("第");
footerRun = footerParagraph.createRun();
footerRun.setText(String.valueOf(pageNum));
footerRun.setBold(true);
footerRun = footerParagraph.createRun();
footerRun.setText("页");

其中，`pageNum` 是当前页的页码。您需要在生成每一页时更新 `pageNum` 的值。例如：

for (int i = 0; i < poiData.size(); i++) {
    // 创建一页
    XWPFParagraph titleParagraph = doc.createParagraph();
    titleParagraph.setAlignment(ParagraphAlignment.CENTER);
    XWPFRun titleRun = titleParagraph.createRun();
    titleRun.setText("第 " + (i+1) + " 页");

    // 插入数据
    List<String> data = poiData.get(i);
    for (String text : data) {
        XWPFParagraph dataParagraph = doc.createParagraph();
        XWPFRun dataRun = dataParagraph.createRun();
        dataRun.setText(text);
    }

    // 在页脚插入页码
    pageNum = i+1;
    XWPFParagraph footerParagraph = doc.createParagraph();
    footerParagraph.setAlignment(ParagraphAlignment.CENTER);
    XWPFRun footerRun = footerParagraph.createRun();
    footerRun.setText("第");
    footerRun = footerParagraph.createRun();
    footerRun.setText(String.valueOf(pageNum));
    footerRun.setBold(true);
    footerRun = footerParagraph.createRun();
    footerRun.setText("页");

    // 添加分页符
    if (i < poiData.size() - 1) {
        XWPFParagraph breakParagraph = doc.createParagraph();
        breakParagraph.setPageBreak(true);
    }
}

这样，每页都会在页脚处显示页码。