Question

I am new to Apache-poi and using 3.8 version of poi. While writing value in the Excel,i check for the column names if they matched, i will write some value in that column and finish it, and again i will start writing on header. The problem is if write three column values only last column values are add or saved and first two values are not saved in the column. Can anyone tell what went wrong.
(sorry, in case any mistake)

 Code:
            int i = 0;
        Row row = sheet.createRow(i);
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillBackgroundColor(HSSFColor.LIGHT_ORANGE.index);
        String validate_header = null;
        while (iterator.hasNext()) {
            if (eiterator.hasNext()) {
                validate_header = eiterator.next();
            }
            Cell cell = row.createCell(i);
            String col_heading = iterator.next();
            cell.setCellValue(col_heading);
            if(col_heading.equalsIgnoreCase("Assigned Date"))
            {
                Add_value(i, col_heading, row, sheet);
                row=sheet.getRow(0);
                cell=row.getCell(i);
            }
            else if(col_heading.startsWith("Review"))
            {
                int count=-1;
                int n=Col_values.get("Defect Summary").size();
                for (int j = 0; j < n; j++) {
                            row = sheet.createRow(count);
                    cell = row.createCell(i);
                    String s="External QC Defect ";     
                    cell.setCellValue(s);
                    count++;

                }
                row=sheet.getRow(0);
                cell=row.getCell(i);

            }

            sheet.autoSizeColumn(i);
            i++;

        }

private static Sheet Add_value(int k,String name,Row row, Sheet sheet) {

        System.out.println("Inside the add method");


        if(name.equalsIgnoreCase("Assigned Date")||name.equalsIgnoreCase("Reported Date") )
        {
        vector = Col_values.get("TargetDate");
        int count = 1;

        System.out.println("IF Size of the vector  " + vector.size());
        for (int j = 0; j < vector.size(); j++) {

            row = sheet.createRow(count);
            cell = row.createCell(k);
            String s = (String) vector.get(j);
            System.out.println(s);
            cell.setCellValue(s);
            count++;

        }
        }
        else
        {
        vector = Col_values.get("Defect Summary");
            int count = 1;
    System.out.println("ELSE Size of the vector  " + vector.size());
        for (int j = 0; j < vector.size(); j++) {

            row = sheet.createRow(count);
            cell = row.createCell(k);
            String s = (String) vector.get(j);
            System.out.println(s);
            cell.setCellValue(s);
            count++;
        }
        }
        return sheet;

    }

‘

Can u tell what went Wrong?

Answer 1

It seems that Add_value starts creating rows from top. Therefore on the second call the old rows are removed.

Replace

         row = sheet.createRow(count);

with

         row = k == 0 ? sheet.createRow(count) : sheet.getRow(count);