POI字无法垂直合并新创建的单元格

Question

我知道如何用Apache POI Word垂直合并单元格。但似乎如果创建了新行，合并就不会生效。

下面是输入表：

我希望在旧行2和旧行3之间添加一个新行，并将新行的第一列单元格合并到C2，如下所示：

public class POIWordAddSubRowQuestionDemo{
    public static void main(String[] args) throws IOException, XmlException{
        ClassLoader classLoader = POIWordAddSubRowQuestionDemo.class.getClassLoader();
        InputStream inputStream = classLoader.getResourceAsStream("input.docx");
        String outputDocxPath = "F:/TEMP/output.docx";
        assert inputStream != null;
        XWPFDocument doc = new XWPFDocument(inputStream);
        XWPFTable table = doc.getTables().get(0);
        //this is 'old row 2'
        XWPFTableRow secondRow = table.getRows().get(1);

        //create a new row that is based on 'old row 2'
        CTRow ctrow = CTRow.Factory.parse(secondRow.getCtRow().newInputStream());
        XWPFTableRow newRow = new XWPFTableRow(ctrow, table);
        XWPFRun xwpfRun = newRow.getCell(1).getParagraphs().get(0).getRuns().get(0);
        //set row text
        xwpfRun.setText("new row", 0);
        // add new row below 'old row 2'
        table.addRow(newRow, 2);

        //merge cells at first column of 'old row 2', 'new row', and 'old row 3'
        mergeCellVertically(doc.getTables().get(0), 0, 1, 3);

        FileOutputStream fos = new FileOutputStream(outputDocxPath);
        doc.write(fos);
        fos.close();
    }

    static void mergeCellVertically(XWPFTable table, int col, int fromRow, int toRow) {
        for(int rowIndex = fromRow; rowIndex <= toRow; rowIndex++) {
            XWPFTableCell cell = table.getRow(rowIndex).getCell(col);
            CTVMerge vmerge = CTVMerge.Factory.newInstance();
            if(rowIndex == fromRow){
                // The first merged cell is set with RESTART merge value
                vmerge.setVal(STMerge.RESTART);
            } else {
                // Cells which join (merge) the first one, are set with CONTINUE
                vmerge.setVal(STMerge.CONTINUE);
                // and the content should be removed
                for (int i = cell.getParagraphs().size(); i > 0; i--) {
                    cell.removeParagraph(0);
                }
                cell.addParagraph();
            }
            // Try getting the TcPr. Not simply setting an new one every time.
            CTTcPr tcPr = cell.getCTTc().getTcPr();
            if (tcPr == null) tcPr = cell.getCTTc().addNewTcPr();
            tcPr.setVMerge(vmerge);
        }
    }
}

那么有没有合并新创建行的解决方案呢？我真的不想这样拆分这个操作：添加行>将docx保存到磁盘>从磁盘读取docx>合并行。

Answer 1

问题不在于MergeCellVertily方法，而在于复制表行的方法。当复制基础ctrow并使用xwpftable.addrow将其插入ctbl.trarray时，必须完全完成。以后的更改不是用XML编写的。在我的回答中，java Apache POI Word现有的表，插入行的单元格样式和格式已经告诉了这一点。我在回答中提供了一个方法committableRows不能更改。docx文件中的行文本，一旦行添加到table。在写出文档之前需要调用此方法，因此后面的更改将写入XML。

因此，因为您正在复制第二行，这是合并的开始，所以该设置也会被复制。后面称为MergeCellVertily的命令不生效。因此，newrow仍然是合并的新起点。这就是你得到的。

因此，在所有更改之后，在写出之前，调用committableRows。

import java.io.*;
import org.apache.poi.xwpf.usermodel.*;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.*;


public class WordInsertTableRowAndMerge {
    
 static XWPFTableRow insertNewTableRow(XWPFTableRow sourceTableRow, int pos) throws Exception {
  XWPFTable table = sourceTableRow.getTable();
  CTRow newCTRrow = CTRow.Factory.parse(sourceTableRow.getCtRow().newInputStream());
  XWPFTableRow tableRow = new XWPFTableRow(newCTRrow, table);
  table.addRow(tableRow, pos);
  return tableRow;
 }

 static void commitTableRows(XWPFTable table) {
  int rowNr = 0;
  for (XWPFTableRow tableRow : table.getRows()) {
   table.getCTTbl().setTrArray(rowNr++, tableRow.getCtRow());
  }
 }
    
 static void mergeCellVertically(XWPFTable table, int col, int fromRow, int toRow) {
  for(int rowIndex = fromRow; rowIndex <= toRow; rowIndex++) {
   System.out.println("rowIndex: " + rowIndex);
   XWPFTableCell cell = table.getRow(rowIndex).getCell(col);
   CTVMerge vmerge = CTVMerge.Factory.newInstance();
   if(rowIndex == fromRow){
    // The first merged cell is set with RESTART merge value
    vmerge.setVal(STMerge.RESTART);
   } else {
    // Cells which join (merge) the first one, are set with CONTINUE
    vmerge.setVal(STMerge.CONTINUE);
    // and the content should be removed
    for (int i = cell.getParagraphs().size(); i > 0; i--) {
     cell.removeParagraph(0);
    }
    cell.addParagraph();
   }
   // Try getting the TcPr. Not simply setting an new one every time.
   CTTcPr tcPr = cell.getCTTc().getTcPr();
   if (tcPr == null) tcPr = cell.getCTTc().addNewTcPr();
   tcPr.setVMerge(vmerge);
  }
 }
 
 public static void main(String[] args) throws Exception {

  XWPFDocument doc = new XWPFDocument(new FileInputStream("./source.docx"));
  
  XWPFTable table = doc.getTables().get(0);

  XWPFTableRow row = table.getRow(1);
  XWPFTableRow newRow = insertNewTableRow(row, 2);
  
  XWPFTableCell cell = newRow.getCell(0); if (cell == null) cell = newRow.addNewTableCell();
  // not needed because merged to cell above
  cell = newRow.getCell(1); if (cell == null) cell = newRow.addNewTableCell();
  for (XWPFParagraph paragraph : cell.getParagraphs()) { // only use first text runs in paragraphs
   for (int r = paragraph.getRuns().size()-1; r >= 0; r--) {
    XWPFRun run = paragraph.getRuns().get(r);
    if (r == 0) {
     run.setText("new row 1", 0);
    } else {
     paragraph.removeRun(r); 
    }
   }
  }

  mergeCellVertically(table, 0, 1, 3);

  commitTableRows(table);

  FileOutputStream out = new FileOutputStream("./result.docx");
  doc.write(out);
  out.close();
  doc.close();

 }
}