java - Apache POI 复制时更新公式引用

Question

在 Apache POI 中复制公式时是否可以更新公式引用？

假设在 Excel 中，第 1 行中有公式 =A1/B1。如果您复制粘贴它，例如在第 5 行，公式将变为 =A5/B5。

在 Apache POI 中，如果运行以下行

r5.getCell(2).setCellType(CellType.FORMULA);
r5.getCell(2).setCellFormula(r1.getCell(2).getCellFormula());

公式仍然是=A1/B1。

Answer 1

您的代码不是复制/粘贴某些内容，而是从一个单元格获取公式字符串，并将该公式字符串精确设置到另一个单元格。这不会改变公式字符串。到底应该怎样做呢？

因此需要从一个单元格中获取公式字符串，然后将此公式字符串调整到目标单元格。

既然apache poi能够计算公式，它也必须能够解析公式。解析类位于包 org.apache.poi.ss.formula 中和 org.apache.poi.ss.formula.ptg .

因此我们可以使用这些类将公式字符串调整为目标单元格。

示例:

以下 Excel 工作簿:

和以下代码:

import java.io.FileInputStream;

import org.apache.poi.ss.formula.*;
import org.apache.poi.ss.formula.ptg.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

import org.apache.poi.ss.util.CellAddress;

public class ExcelCopyFormula {

 private static String copyFormula(XSSFSheet sheet, String formula, int coldiff, int rowdiff) {

  XSSFEvaluationWorkbook workbookWrapper = 
   XSSFEvaluationWorkbook.create((XSSFWorkbook) sheet.getWorkbook());
  Ptg[] ptgs = FormulaParser.parse(formula, workbookWrapper, FormulaType.CELL
   , sheet.getWorkbook().getSheetIndex(sheet));

  for (int i = 0; i < ptgs.length; i++) {
   if (ptgs[i] instanceof RefPtgBase) { // base class for cell references
    RefPtgBase ref = (RefPtgBase) ptgs[i];
    if (ref.isColRelative())
     ref.setColumn(ref.getColumn() + coldiff);
    if (ref.isRowRelative())
     ref.setRow(ref.getRow() + rowdiff);
   }
   else if (ptgs[i] instanceof AreaPtgBase) { // base class for range references
    AreaPtgBase ref = (AreaPtgBase) ptgs[i];
    if (ref.isFirstColRelative())
     ref.setFirstColumn(ref.getFirstColumn() + coldiff);
    if (ref.isLastColRelative())
     ref.setLastColumn(ref.getLastColumn() + coldiff);
    if (ref.isFirstRowRelative())
     ref.setFirstRow(ref.getFirstRow() + rowdiff);
    if (ref.isLastRowRelative())
     ref.setLastRow(ref.getLastRow() + rowdiff);
   }
  }

  formula = FormulaRenderer.toFormulaString(workbookWrapper, ptgs);
  return formula;
 }

 public static void main(String[] args) throws Exception {

  XSSFWorkbook workbook = (XSSFWorkbook)WorkbookFactory.create(new FileInputStream("test.xlsx"));  
  XSSFSheet sheet = workbook.getSheetAt(0);
  for (Row row : sheet) {
   for (Cell cell : row) {
    //if (cell.getCellTypeEnum() == CellType.FORMULA) { // up to apache poi version 3
    if (cell.getCellType() == CellType.FORMULA) { // since apache poi version 4
     CellAddress source = cell.getAddress();
     String formula = cell.getCellFormula();
     System.out.print(source + "=" + formula);
     int rowdiff = 3;
     int coldiff = -2;
     CellAddress target = new CellAddress(source.getRow() + rowdiff, source.getColumn() + coldiff);
     String newformula = copyFormula(sheet, formula, coldiff, rowdiff);
     System.out.println("->" + target + "=" + newformula);
    }
   }
  }

  workbook.close();
 }
}

导致以下输出:

E3=C3/D3->C6=A6/B6
E4=$C4/D$4->C7=$C7/B$4
E5=SUM(C3:D5)->C8=SUM(A6:B8)
E6=SUM(C$3:$D6)->C9=SUM(A$3:$D9)
E7=C3+SUM(C3:D7)->C10=A6+SUM(A6:B10)
E8=C$3+SUM($C3:D$8)->C11=A$3+SUM($C6:B$8)

<小时/>

更新了 String copyFormula(Sheet Sheet, String Formula, int Coldiff, int rowdiff) 方法，该方法适用于 SS，适用于 HSSF以及XSSF:

 private static String copyFormula(Sheet sheet, String formula, int coldiff, int rowdiff) {

  Workbook workbook = sheet.getWorkbook();
  EvaluationWorkbook evaluationWorkbook = null;
  if (workbook instanceof HSSFWorkbook) {
   evaluationWorkbook = HSSFEvaluationWorkbook.create((HSSFWorkbook) workbook);
  } else if (workbook instanceof XSSFWorkbook) {
   evaluationWorkbook = XSSFEvaluationWorkbook.create((XSSFWorkbook) workbook);
  }

  Ptg[] ptgs = FormulaParser.parse(formula, (FormulaParsingWorkbook)evaluationWorkbook, 
   FormulaType.CELL, sheet.getWorkbook().getSheetIndex(sheet));

  for (int i = 0; i < ptgs.length; i++) {
   if (ptgs[i] instanceof RefPtgBase) { // base class for cell references
    RefPtgBase ref = (RefPtgBase) ptgs[i];
    if (ref.isColRelative())
     ref.setColumn(ref.getColumn() + coldiff);
    if (ref.isRowRelative())
     ref.setRow(ref.getRow() + rowdiff);
   }
   else if (ptgs[i] instanceof AreaPtgBase) { // base class for range references
    AreaPtgBase ref = (AreaPtgBase) ptgs[i];
    if (ref.isFirstColRelative())
     ref.setFirstColumn(ref.getFirstColumn() + coldiff);
    if (ref.isLastColRelative())
     ref.setLastColumn(ref.getLastColumn() + coldiff);
    if (ref.isFirstRowRelative())
     ref.setFirstRow(ref.getFirstRow() + rowdiff);
    if (ref.isLastRowRelative())
     ref.setLastRow(ref.getLastRow() + rowdiff);
   }
  }

  formula = FormulaRenderer.toFormulaString((FormulaRenderingWorkbook)evaluationWorkbook, ptgs);
  return formula;
 }