Apache POI xls 列刪除

Question

我找不到如何使用 Apache POI API 刪除列。
在這一點上，我將不勝感激示例代碼或幫助。

Answer 1

郵件列表上的 Alan Williamson寫了一個刪除列的小幫手

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;
            }
        }

    }
}

Answer 2

cporte 的答案非常好，但恕我直言有點難以閱讀。

---

理念：

對於每一行，刪除代表應刪除的列的單元格，並將該列右側的所有單元格向左移動一個。

---

簡化的實現：

//Variables for completeness
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.getCellType());
            cloneCell(cNew, cNext);
            sheet.setColumnWidth(cID, sheet.getColumnWidth(cID + 1));
        }
    }
}

---

為了完整性從其他答案復制的克隆細胞方法：

 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; } } }

Answer 3

codewing 的解決方案對我來說就像一個魅力，具有以下微小變化：

1. 當我們克隆單元格時，調用應該是 cloneCell(cNew, cNext)
2. 我們應該只為第一行設置列寬。
3. 我使用的是 3.17 版的 api，因此發生了一些變化（例如 CellType 從 int 更改為 enum）。

完整代碼如下（為清楚起見）：

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());
    }
}

Answer 4

我認為您必須在每個 HSSFRow 下調用 HSSFRow.getCell，然后調用 HSSFRow.removeCell。 API 面向行，而不是列，並且很少有操作在整個列級別進行。

示例代碼（未經測試）：

HSSFSheet sheet = ...
int colToRemove = 5;
Iterator rowIter = sheet.iterator();
while (rowIter.hasNext()) {
   HSSFRow row = (HSSFRow)rowIter.next();
   HSSFCell cell = row.getCell(colToRemove);
   row.removeCell(cell);
}

Answer 5

有一個術語混淆：作者作者想要實現的動作在 Apache POI 接口術語中稱為列移位。 org.apache.poi.ss.usermodel.Sheet接口提供了一個干凈的方法來做這樣的事情：

sheet.shiftColumns(startRangeIndex, endRangeIndex, directionQuantifier);

例如，將 B 列移動到左側一個位置很容易通過調用來實現：

Sheet sheet = loadRequiredSheet();
sheet.shiftColumns(2, 3, -1);

Column A        Column B                 Column C
Data here    to be removed   <- t should be moved to the left

Answer 6

上面的代碼運行良好，但我對我們正在使用的 POI 版本做了一些修改，以防您使用 POI 版本 4.0.0。 您可以參考下面的代碼，使用 java 和 POI 刪除 excel 中的列。

public static void deleteColumn(XSSFSheet 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.getCellType());
                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));

                }
            }
        }
    }
}


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

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