poi添加目录

要在使用POI创建的Word文档中添加目录，可以按照以下步骤操作：

1. 在文档中插入一个空白页作为目录页，可以使用以下代码：

XWPFDocument doc = new XWPFDocument();
XWPFParagraph para = doc.createParagraph();
XWPFRun run = para.createRun();
run.addBreak(BreakType.PAGE);

2. 在目录页中创建一个段落，设置段落格式为“标题1”，然后添加目录文字，可以使用以下代码：

XWPFParagraph para = doc.createParagraph();
para.setStyle("Heading1");
XWPFRun run = para.createRun();
run.setText("Table of Contents");

3. 在文档中添加需要在目录中列出的标题和页码，可以使用以下代码：

// 标题
XWPFParagraph titlePara = doc.createParagraph();
titlePara.setStyle("Heading2");
XWPFRun titleRun = titlePara.createRun();
titleRun.setText("Title 1");

// 页码
XWPFParagraph pgNumPara = doc.createParagraph();
pgNumPara.setAlignment(ParagraphAlignment.RIGHT);
XWPFRun pgNumRun = pgNumPara.createRun();
pgNumRun.setText(Integer.toString(doc.getPosOfParagraph(titlePara)+1));

4. 在目录中添加标题和页码的引用，可以使用以下代码：

CTBookmark bookmark = para.getCTP().addNewBookmarkStart();
bookmark.setName("_Toc123456789"); // 填写目录项的名称
bookmark.setId(BigInteger.valueOf(1)); // 填写唯一ID号
CTMarkupRange range = para.getCTP().addNewBookmarkEnd();
range.setId(BigInteger.valueOf(1));

// 添加目录项
XWPFRun tocRun = para.createRun();
tocRun.addTab();
tocRun.setText(titleRun.text());
tocRun.addTab();
tocRun.setText(pgNumRun.text());

5. 最后，更新目录，可以使用以下代码：

CTDocument1 document = doc.getDocument();
CTBody body = document.getBody();
if(!body.isSetSectPr()){
    body.addNewSectPr();
}
CTP ctp = CTP.Factory.newInstance();
XWPFParagraph tmpParagraph = new XWPFParagraph(ctp, doc);
XWPFParagraph[] paragraphs = new XWPFParagraph[1];
paragraphs[0] = tmpParagraph;
XWPFStyles styles = doc.getStyles();
XWPFStyle style = styles.getStyle("TOCHeading");
if(style == null){
    style = styles.addNewStyle("TOCHeading", "org.apache.poi.xwpf.usermodel.TOCHeading");
    style.setType(STStyleType.CHARACTER);
    style.setQFormat(true);
}
CTPPr ppr = ctp.addNewPPr();
ppr.setOutlineLvl(STOutlineLevel.H0);
tmpParagraph.setStyle("TOCHeading");
XWPFTable table = doc.insertNewTbl(tmpParagraph.getCTP().newCursor());
XWPFTableRow row = table.getRow(0);
XWPFTableCell cell = row.getCell(0);
cell.removeParagraph(0);
XWPFParagraph newPara = cell.addParagraph();
newPara.setStyle("TOCHeading");
newPara.setAlignment(ParagraphAlignment.CENTER);
XWPFRun run = newPara.createRun();
run.setText("Table of Contents");
run.setBold(true);
run.setFontSize(16);

CTBookmark bookmark = newPara.getCTP().addNewBookmarkStart();
bookmark.setName("_Toc1234567890");
bookmark.setId(BigInteger.valueOf(0));
CTMarkupRange range = newPara.getCTP().addNewBookmarkEnd();
range.setId(BigInteger.valueOf(0));

for(int i=0; i<paragraphs.length; i++){
    XWPFParagraph paragraph = paragraphs[i];
    CTP ctP = paragraph.getCTP();
    XWPFParagraph newParagraph = new XWPFParagraph(ctP, doc);
    newParagraph.setStyle("TOC1");
    XWPFRun insertRun = newParagraph.createRun();
    insertRun.setText(paragraph.getText());
    String[] split = paragraph.getText().split("\t");
    if(split.length == 2){
        insertRun.setText(split[1]);
    }
    insertRun.addTab();
    insertRun.setText(paragraph.getDocument().getPosOfParagraph(paragraph)+"");
    cell = row.createCell();
    cell.setVerticalAlignment(XWPFVertAlign.CENTER);
    cell.addParagraph(newParagraph);
}

注意：以上代码仅供参考，具体实现可能需要根据实际需求进行调整。