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How to merge cells (or apply colspan) using XWPFTable in POI in Java?

Creating a table in poi was pretty simple, but it has very limited tutorials, and I cannot find one that can create a simple merged cell in the table when creating the docx file.

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If you created a table, a row inside a table, and cells inside a row, you can add gridSpan to the cell properties:

if (cell.getCTTc().getTcPr() == null) cell.getCTTc().addNewTcPr();
if (cell.getCTTc().getTcPr().getGridSpan() == null) cell.getCTTc().getTcPr().addNewGridSpan();
cell.getCTTc().getTcPr().getGridSpan().setVal(2);

Note: the cell is org.apache.poi.xwpf.usermodel.XWPFTableCell.

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XWPFTable . . , poi-3.9.jar, poi-ooxml-3.9.jar poi-ooxml-schemas-3.9.jar

XWPFTable table1 = document.createTable(1,1); // This is your row 1
XWPFTable table2 = document.createTable(1,3); // This is your row 2

// Now it time to span each column of table1 and table2 to a span of your choice
// lets say 6 is the total span required assuming there some row with 6 columns.

spanCellsAcrossRow(table1, 0, 0, 6);
spanCellsAcrossRow(table2, 0, 0, 2);
spanCellsAcrossRow(table2, 0, 1, 2);
spanCellsAcrossRow(table2, 0, 2, 2);

private void spanCellsAcrossRow(XWPFTable table, int rowNum, int colNum, int span) {
    XWPFTableCell  cell = table.getRow(rowNum).getCell(colNum);
    cell.getCTTc().getTcPr().addNewGridSpan();
    cell.getCTTc().getTcPr().getGridSpan().setVal(BigInteger.valueOf((long)span));
}
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/, 2 CTHMerge setVal:

  • , (STMerge.RESTART);
  • (STMerge.CONTINUE);

a) 2x2 ( ):

| ___________ | ___________ | → | ___________ ___________ | | ___________ | ___________ | → | ___________ ___________ |

 // First Row
CTHMerge hMerge = CTHMerge.Factory.newInstance();
vmerge.setVal(STMerge.RESTART);
table.getRow(0).getCell(0).getCTTc().getTcPr().setHMerge(hMerge);
table.getRow(1).getCell(0).getCTTc().getTcPr().setHMerge(hMerge);

 // Secound Row cell will be merged/"deleted"
CTHMerge hMerge1 = CTHMerge.Factory.newInstance();
hMerge.setVal(STMerge.CONTINUE);
table.getRow(0).getCell(1).getCTTc().getTcPr().setHMerge(hMerge1);
table.getRow(1).getCell(1).getCTTc().getTcPr().setHMerge(hMerge1);

b) ( )

 // First Row
CTVMerge vmerge = CTVMerge.Factory.newInstance();
vmerge.setVal(STMerge.RESTART);
table.getRow(0).getCell(0).getCTTc().getTcPr().setVMerge(vmerge);
table.getRow(0).getCell(1).getCTTc().getTcPr().setVMerge(vmerge);

 // Secound Row cell will be merged 
CTVMerge vmerge1 = CTVMerge.Factory.newInstance();
vmerge.setVal(STMerge.CONTINUE);
table.getRow(1).getCell(0).getCTTc().getTcPr().setVMerge(vmerge1);
table.getRow(1).getCell(1).getCTTc().getTcPr().setVMerge(vmerge1);
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