Apache POI xls-Spalte Entfernen

Alan Williamson auf der mailing-Liste schrieb ein kleiner Helfer für Spalte entfernen

package org.alanwilliamson.openbd.plugin.spreadsheet;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;


/*
 * Helper functions to aid in the management of sheets
 */
public class SheetUtility extends Object {


    /**
     * Given a sheet, this method deletes a column from a sheet and moves
     * all the columns to the right of it to the left one cell.
     * 
     * Note, this method will not update any formula references.
     * 
     * @param sheet
     * @param column
     */
    public static void deleteColumn( Sheet 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);
                }
            }
        }


        //Adjust the column widths
        for ( int c=0; c < maxColumn; c++ ){
            sheet.setColumnWidth( c, sheet.getColumnWidth(c+1) );
        }
    }


    /*
     * Takes an existing Cell and merges all the styles and forumla
     * into the new one
     */
    private static 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;
            }
        }

    }
}

codewing Lösung für mich arbeitete wie ein Charme mit folgenden geringfügigen änderungen:

1. Wenn wir duplizieren Sie die Zelle, wird der Anruf sollte cloneCell(cNew, cNext)
2. Müssen wir die Spaltenbreite nur für die erste Zeile.
3. Ich mit der version 3.17 der api, so dass ein paar Dinge geändert (wie CellType geändert von int, enum).

Vollständigen code weiter unten (für die übersichtlichkeit):

private void deleteColumn(Sheet sheet, int columnToDelete) {
    for (int rId = 0; rId < sheet.getLastRowNum(); rId++) {
        Row row = sheet.getRow(rId);
        for (int cID = columnToDelete; cID < row.getLastCellNum(); cID++) {
            Cell cOld = row.getCell(cID);
            if (cOld != null) {
                row.removeCell(cOld);
            }
            Cell cNext = row.getCell(cID + 1);
            if (cNext != null) {
                Cell cNew = row.createCell(cID, cNext.getCellTypeEnum());
                cloneCell(cNew, cNext);
                //Set the column width only on the first row.
                //Other wise the second row will overwrite the original column width set previously.
                if(rId == 0) {
                    sheet.setColumnWidth(cID, sheet.getColumnWidth(cID + 1));

                }
            }
        }
    }
}

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

    if (CellType.BOOLEAN == cNew.getCellTypeEnum()) {
        cNew.setCellValue(cOld.getBooleanCellValue());
    } else if (CellType.NUMERIC == cNew.getCellTypeEnum()) {
        cNew.setCellValue(cOld.getNumericCellValue());
    } else if (CellType.STRING == cNew.getCellTypeEnum()) {
        cNew.setCellValue(cOld.getStringCellValue());
    } else if (CellType.ERROR == cNew.getCellTypeEnum()) {
        cNew.setCellValue(cOld.getErrorCellValue());
    } else if (CellType.FORMULA == cNew.getCellTypeEnum()) {
        cNew.setCellValue(cOld.getCellFormula());
    }
}