Merging cells in Excel using Apache POI

Question

Is there any other way to merge cells in Excel using Apache POI library?

I was trying using the following, but its not working

// selecting the region in Worksheet for merging data
CellRangeAddress region = CellRangeAddress.valueOf("A" + rowNo + ":D"
            + rowNo);

// merging the region
sheet1.addMergedRegion(region);

Solution 1

You can use sheet.addMergedRegion(rowFrom,rowTo,colFrom,colTo);

example sheet.addMergedRegion(new CellRangeAddress(1,1,1,4)); will merge from B2 to E2. Remember it is zero based indexing (ex. POI version 3.12).

for detail refer BusyDeveloper's Guide

Solution 2

You can use :

sheet.addMergedRegion(new CellRangeAddress(startRowIndx, endRowIndx, startColIndx,endColIndx));

Make sure the CellRangeAddress does not coincide with other merged regions as that will throw an exception.

• If you want to merge cells one above another, keep column indexes same
• If you want to merge cells which are in a single row, keep the row indexes same
• Indexes are zero based

For what you were trying to do this should work:

sheet.addMergedRegion(new CellRangeAddress(rowNo, rowNo, 0, 3));

Solution 3

The best answer

sheet.addMergedRegion(new CellRangeAddress(start-col,end-col,start-cell,end-cell));

Solution 4

I create a method that merge cells and put border if you want.

protected void setMerge(Sheet sheet, int numRow, int untilRow, int numCol, int untilCol, boolean border) {
    CellRangeAddress cellMerge = new CellRangeAddress(numRow, untilRow, numCol, untilCol);
    sheet.addMergedRegion(cellMerge);
    if (border) {
        setBordersToMergedCells(sheet, cellMerge);
    }

}  

protected void setBordersToMergedCells(Sheet sheet, CellRangeAddress rangeAddress) {
    RegionUtil.setBorderTop(BorderStyle.MEDIUM, rangeAddress, sheet);
    RegionUtil.setBorderLeft(BorderStyle.MEDIUM, rangeAddress, sheet);
    RegionUtil.setBorderRight(BorderStyle.MEDIUM, rangeAddress, sheet);
    RegionUtil.setBorderBottom(BorderStyle.MEDIUM, rangeAddress, sheet);
}

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Comments

[golimar]

if after this, Excel says it has to repair the file, make sure you're not overlapping cells when merging

[James Kleeh]

@golimar What do you mean by overlapping cells?

[golimar]

@JamesKleeh For example, creating one merged region A1+A2 and another merged region A2+A3

[Reinderien]

"The best answer" probably shouldn't include minus signs in variables. Also, the variables are outright wrong: columns are in the third and fourth position, not the first and second.

[gordon613]

Note that there are two versions of CellRangeAddress: the one to use is org.apache.poi.ss.util.CellRangeAddress whereas the other one org.apache.poi.hssf.util.CellRangeAddress is now deprecated. See stackoverflow.com/questions/22267679/…

[Saideep Ullal]

The most wholesome answer. Also explains general guidelines for merging.