to get columns from Excel files using Apache POI?

Question

In order to do some statistical analysis I need to extract values in a column of an Excel sheet. I have been using the Apache POI package to read from Excel files, and it wo

Answer 1

Just wanted to add, in case you have headers in your file and you are not sure about the column index but want to pick columns under specific headers (column names) for eg, you can try something like this

    for(Row r : datatypeSheet) 
            {
                Iterator headerIterator = r.cellIterator();
                Cell header = null;
                // table header row
                if(r.getRowNum() == 0)
                {
                    //  getting specific column's index

                    while(headerIterator.hasNext())
                    {
                        header = headerIterator.next();
                        if(header.getStringCellValue().equalsIgnoreCase("column1Index"))
                        {
                            column1Index = header.getColumnIndex();
                        }
                    }
                }
                else
                {
                    Cell column1Cells = r.getCell(column1);

                    if(column1Cells != null) 
                    {
                        if(column1Cells.getCellType() == Cell.CELL_TYPE_NUMERIC) 
                        {
// adding to a list
                            column1Data.add(column1Cells.getNumericCellValue());
                        }
                        else if(column1Cells.getCellType() == Cell.CELL_TYPE_FORMULA && column1Cells.getCachedFormulaResultType() == Cell.CELL_TYPE_NUMERIC) 
                        {
// adding to a list
                            column1Data.add(column1Cells.getNumericCellValue());
                        }
                    }

                }    
            }