public void deleteColumn(SXSSFSheet sheet, int columnToDelete){        
        int maxColumn = 0;
        for ( int r=0; r < sheet.getLastRowNum()+1; r++ ){
            Row row     = sheet.getRow(r);

            // if no row exists here; then nothing to do; next!
            if ( row == null )
                continue;

            // if the row doesn't have this many columns then we are good; next!
            int lastColumn = row.getLastCellNum();
            if ( lastColumn > maxColumn )
                maxColumn = lastColumn;

            if ( lastColumn < columnToDelete )
                continue;

            for ( int x=columnToDelete+1; x < lastColumn + 1; x++ ){
                Cell oldCell    = row.getCell(x-1);
                if ( oldCell != null )
                    row.removeCell( oldCell );

                Cell nextCell   = row.getCell( x );
                if ( nextCell != null ){
                    Cell newCell    = row.createCell( x-1, nextCell.getCellType() );
                    cloneCell(newCell, nextCell);
                }
            }
        }
    }

    private void cloneCell( Cell cNew, Cell cOld ){
        cNew.setCellComment( cOld.getCellComment() );
        cNew.setCellStyle( cOld.getCellStyle() );

        switch ( cNew.getCellType() ){
            case Cell.CELL_TYPE_BOOLEAN:{
                cNew.setCellValue( cOld.getBooleanCellValue() );
                break;
            }
            case Cell.CELL_TYPE_NUMERIC:{
                cNew.setCellValue( cOld.getNumericCellValue() );
                break;
            }
            case Cell.CELL_TYPE_STRING:{
                cNew.setCellValue( cOld.getStringCellValue() );
                break;
            }
            case Cell.CELL_TYPE_ERROR:{
                cNew.setCellValue( cOld.getErrorCellValue() );
                break;
            }
            case Cell.CELL_TYPE_FORMULA:{
                cNew.setCellFormula( cOld.getCellFormula() );
                break;
            }
        }

    }