java - horizontal - get merged cell range poi




Merge and align center cell using apache poi (6)

I want to export data to excel using Apache poi.
Now the problem that I am facing is that I am unable to merge rows and align them in the center.

Code for export data is:

List<LinkedHashMap<String,Object>> lstReportHeader = null;
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();

//Set Header Font
HSSFFont headerFont = wb.createFont();
headerFont.setBoldweight(headerFont.BOLDWEIGHT_BOLD);
headerFont.setFontHeightInPoints((short) 12);

//Set Header Style
CellStyle headerStyle = wb.createCellStyle();
headerStyle.setFillBackgroundColor(IndexedColors.BLACK.getIndex());
headerStyle.setAlignment(headerStyle.ALIGN_CENTER);
headerStyle.setFont(headerFont);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
int rowCount= 0;
Row header;
header = sheet.createRow(0);//its for header 
Cell cell ;//= header.createCell(0);
for(int j = 0;j < 4; j++) {
    cell = header.createCell(j);
    if(j == 0) {
        cell.setCellValue("ItemWise List");
    }
    cell.setCellStyle(headerStyle);
}
sheet.addMergedRegion(new CellRangeAddress(rowCount, rowCount, 0, lstReportFormHeader.size()-1));
header = sheet.createRow(0);
        cell = header.createCell(0);
cell.setCellValue("Sr. No");
        cell = header.createCell(1);
cell.setCellValue("Item Name");
        cell = header.createCell(2);
cell.setCellValue("Qty");
        cell = header.createCell(3);
cell.setCellValue("Rate");

Now I want to ItemWise List merge and make it align center.


After study I found that after merging 7 cells, merged cell id will be 0 so I applied following style to cell id 0 using following style.

headerStyle.setAlignment(headerStyle.ALIGN_CENTER);

As answered above, merging cells can be achieved using

sheet.addMergedRegion(new CellRangeAddress(frstRow, lastRow, firstColumnIndex, lastColumnIndex));

But for aligning cells vertically,recently I faced similar issue and I tried above answer, but using

CellUtil.setAlignment(dataCell, workbook, CellStyle.VERTICAL_CENTER);

aligned Date formatted cells to Horizontal Left aligned. So I used following method to set only Vertical Alignment of Cell content.

CellUtil.setCellStyleProperty(dataCell, workbook,CellUtil.VERTICAL_ALIGNMENT,CellStyle.VERTICAL_CENTER);

I hope this helps!!

Happy Coding


Merge like:::

 Workbook wb = new HSSFWorkbook();
Sheet sheet = wb.createSheet("new sheet");

Row row = sheet.createRow((short) 1);
Cell cell = row.createCell((short) 1);
cell.setCellValue("This is a test of merging");

sheet.addMergedRegion(new CellRangeAddress(
        1, //first row (0-based)
        1, //last row  (0-based)
        1, //first column (0-based)
        2  //last column  (0-based)
));

// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();

For aligning also check the below official link of Apache poi:::

http://poi.apache.org/spreadsheet/quick-guide.html#Alignment


My solution was to merge the cells by their positions, then created a cell (reference to the first block of the merged cells) to assign a value and then set the alignment throught the CellUtil

// Merges the cells
CellRangeAddress cellRangeAddress = new CellRangeAddress(start, start, j, j + 1);
sheet.addMergedRegion(cellRangeAddress);

// Creates the cell
Cell cell = CellUtil.createCell(row, j, entry.getKey());

// Sets the allignment to the created cell
CellUtil.setAlignment(cell, workbook, CellStyle.ALIGN_CENTER);

Use style.setVerticalAlignment() to set the vertical alignments instead of style.setAlignment().


Well what worked for me is to set all the merged cells' Cellstyle to CENTER ALIGN. Whether you put the XSSFSheet.addMergedRegion() method before or after setting the cellstyle values to center don't matter.

    private void insertXlsHeader(XSSFSheet sheet){
    ....
    //first cell for row1       
    cell = row1.createCell(colstart);
    cell.setCellType(org.apache.poi.ss.usermodel.Cell.CELL_TYPE_STRING);
    cell.setCellValue("COURSES");
    setHeaderCellStyle(sheet,cell);

    //first cell for row2
    cell = row2.createCell(colstart);
    setHeaderCellStyle(sheet,cell);

    //first cell for row3
    cell = row3.createCell(colstart);
    setHeaderCellStyle(sheet,cell);

    //merged the first cells of rows 1 to 3
    sheet.addMergedRegion(new CellRangeAddress(ROW1, ROW3, colstart, colstart));
    ...
    }

private void setHeaderCellStyle(XSSFSheet sheet,org.apache.poi.ss.usermodel.Cell cell) {
    CellStyle s = null;

        s = sheet.getWorkbook().createCellStyle();
        cell.setCellStyle(s);

    Font f = sheet.getWorkbook().createFont();

    f.setBoldweight(Font.BOLDWEIGHT_BOLD);


    s.setBorderBottom(CellStyle.BORDER_THIN);
    s.setBorderLeft(CellStyle.BORDER_THIN);
    s.setBorderRight(CellStyle.BORDER_THIN);
    s.setBorderTop(CellStyle.BORDER_THIN);
    s.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
    s.setAlignment(CellStyle.ALIGN_CENTER);
    s.setFont(f);

}




apache-poi