基于范围的 Apache poi 公式评估

问题描述 投票：0回答：1

我们正在尝试在java maven项目中使用poi评估xlsx公式，但是如果公式具有范围或数组，则输出值是重复的。

以下是预期与 POI 输出：

预期产量

poi输出

J 和 K 列没有任何公式单元格。 L 和 M 列具有依赖于 J 和 K 数据的公式单元格。

这是在 J 和 K 列的 7 行中定义的公式：

Column J :
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J6)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J6))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J7)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J7))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J8)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J8))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J9)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J9))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J10)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J10))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J11)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J11))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J12)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J12))))

Column K :
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K6)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K6))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K7)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K7))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K8)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K8))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K9)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K9))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K10)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K10))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K11)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K11))))
=IF(COUNTIF($J$6:$J$62,"?*")<ROW(K12)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K12))))

如果我们比较上面的图像（预期与 poi 输出），那么我们会发现 poi 给出了错误的结果并重复 J 和 K 中的项目，而 MS excel 能够正确计算。

尝试过公式计算器 

evaluateAll
和 
evaluateFormulaCell
。不会产生正确的结果。
尝试过 
evaluator.clearAllCachedResultValues();
和 
evaluator.notifySetFormula(cell);
看来 poi 不支持这些公式。 使用XSSFWorkBook。

    FileInputStream fis = new FileInputStream(inputFile);
    Workbook workbook = new XSSFWorkbook(fis);
    FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
    // some code in between, loops etc
    if (cell.getCellType() == CellType.FORMULA) {
        evaluator.evaluateFormulaCell(cell);    
    }

    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>            
        <version>5.2.4</version>
    </dependency>       
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>5.2.4</version>
    </dependency>
java excel spring-boot apache-poi xlsx
1个回答
0
投票

这里的主要问题是 Apache POI 没有提供 

ArrayFunction
那样的所有功能。在这种特殊情况下，Excel 函数 ROW 由 
Java
函数 org.apache.poi.ss.formula.functions.RowFunc 表示，该函数尚未准备好在数组上下文中运行。

可以通过更改该 

Java
函数的代码来更改。该代码需要考虑“如果引用是单元格范围，并且如果 ROW 作为垂直数组输入，则 ROW 将引用的行号作为垂直数组返回。”。我的函数 
RowFuncArrayReady
就是这样做的。

import org.apache.poi.ss.formula.functions.*;

import org.apache.poi.ss.formula.eval.AreaEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.RefEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.CacheAreaEval;

/**
 * Implementation for the Excel function ROW ready for usage as ArrayFunction
 */
public final class RowFuncArrayReady implements Function, ArrayFunction {
    @Override
    public ValueEval evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        if (args.length > 1) {
            return ErrorEval.VALUE_INVALID;
        }
        if (args.length == 0) {
            return new NumberEval(srcRowIndex + 1.);
        } else {
            return evaluate(srcRowIndex, srcColumnIndex, args[0]);
        }
    }
        
    public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) {
        int rnum;
        if (arg0 instanceof AreaEval) {
            rnum = ((AreaEval)arg0).getFirstRow();
        } else if (arg0 instanceof RefEval) {
            rnum = ((RefEval)arg0).getRow();
        } else {
            // anything else is not valid argument
            return ErrorEval.VALUE_INVALID;
        }
        return new NumberEval(rnum + 1.);
    }
    
    @Override
    public ValueEval evaluateArray(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        if (args.length > 1) {
            return ErrorEval.VALUE_INVALID;
        }
        if (args.length == 0) {
            return new NumberEval(srcRowIndex + 1.);
        } else if (args[0] instanceof AreaEval) {
            return evaluateAreaEval((AreaEval)args[0], srcRowIndex, srcColumnIndex);
        } else if (args[0] instanceof RefEval) {
            return evaluate(srcRowIndex, srcColumnIndex, (RefEval)args[0]);
        } else {
            // anything else is not valid argument
            return ErrorEval.VALUE_INVALID;
        }
    }   
    
    private ValueEval evaluateAreaEval(AreaEval ae, int srcRowIndex, int srcColumnIndex) {
        int w1, w2, h1, h2;
        int a1FirstCol = 0, a1FirstRow = 0;
        w1 = ae.getWidth();
        h1 = ae.getHeight();
        a1FirstCol = ae.getFirstColumn();
        a1FirstRow = ae.getFirstRow();
        w2 = 1;
        h2 = 1;
        int width = Math.max(w1, w2);
        int height = Math.max(h1, h2);
        ValueEval[] vals = new ValueEval[height * width];
        int idx = 0;
        for(int i = 0; i < height; i++){
            for(int j = 0; j < width; j++){
                vals[idx++] = evaluate(srcRowIndex, srcColumnIndex, ae.offset(i, i, j, j));
            }
        }
        if (vals.length == 1) {
            return vals[0];
        }
        return new CacheAreaEval(srcRowIndex, srcColumnIndex, srcRowIndex + height - 1, srcColumnIndex + width - 1, vals);
    }
        
}

要使该新函数成为 Excel ROW 函数的默认表示形式，它需要位于索引 8 处的 

Function[] functions
org.apache.poi.ss.formula.eval.FunctionEval 数组中。在以下代码中，方法 
prepareFunctionEval
当被称为 
prepareFunctionEval(8, new RowFuncArrayReady());
时就会这样做。

import org.apache.poi.ss.usermodel.*;

import java.io.FileInputStream;

class ExcelEvaluateROWFormulaAsArray  {
     
 static void prepareFunctionEval(int pos, org.apache.poi.ss.formula.functions.Function function) throws Exception {
  java.lang.reflect.Field _functions = Class.forName("org.apache.poi.ss.formula.eval.FunctionEval").getDeclaredField("functions");
  _functions.setAccessible(true); 
  org.apache.poi.ss.formula.functions.Function[] functions = (org.apache.poi.ss.formula.functions.Function[])_functions.get(null); 
  functions[pos] = function;
 }

 public static void main(String[] args) throws Exception {
     
  prepareFunctionEval(8, new RowFuncArrayReady());
   
  Workbook workbook = WorkbookFactory.create(new FileInputStream("./ExcelUsingRowFormulaInArrayContext.xlsx"));
  FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator(); 
  
  evaluator.setDebugEvaluationOutputForNextEval(true);  
 
  Sheet sheet = workbook.getSheetAt(0);
  
  for (Row row : sheet) {
   for (Cell cell : row) {
    if (CellType.FORMULA == cell.getCellType()) {
     System.out.println(cell.getCellFormula());
     CellValue cellValue = evaluator.evaluate(cell);
     System.out.println(cellValue);
    }
   }
  }
  
  workbook.close();
 }
}

我的

ExcelUsingRowFormulaInArrayContext.xlsx
看起来像这样：

注意，公式

{=IF(COUNTIF($J$6:$J$62,"?*")<ROW(J6)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J6))))}
是使用CtrlShiftEnter输入的数组公式。 Apache POI 无法评估 Excel 365 的新动态数组公式和溢出数组行为。

我的

ExcelEvaluateROWFormulaAsArray
然后打印：

IF(COUNTIF($J$6:$J$62,"?*")<ROW(J6)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J6))))
org.apache.poi.ss.usermodel.CellValue ["Text 1"]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K6)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K6))))
org.apache.poi.ss.usermodel.CellValue [1.0]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J7)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J7))))
org.apache.poi.ss.usermodel.CellValue ["Text 2"]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K7)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K7))))
org.apache.poi.ss.usermodel.CellValue [2.0]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J8)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J8))))
org.apache.poi.ss.usermodel.CellValue ["Text 3"]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K8)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K8))))
org.apache.poi.ss.usermodel.CellValue [3.0]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J9)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J9))))
org.apache.poi.ss.usermodel.CellValue ["Text 4"]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K9)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K9))))
org.apache.poi.ss.usermodel.CellValue [4.0]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J10)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J10))))
org.apache.poi.ss.usermodel.CellValue ["Text 5"]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K10)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K10))))
org.apache.poi.ss.usermodel.CellValue [5.0]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J11)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J11))))
org.apache.poi.ss.usermodel.CellValue [""]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K11)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K11))))
org.apache.poi.ss.usermodel.CellValue [""]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(J12)-5,"",INDEX(J:J,SMALL(IF(J$6:J$62<>"",ROW(J$6:J$62)),ROWS(J$6:J12))))
org.apache.poi.ss.usermodel.CellValue [""]
IF(COUNTIF($J$6:$J$62,"?*")<ROW(K12)-5,"",INDEX(K:K,SMALL(IF(K$6:K$62<>"",ROW(K$6:K$62)),ROWS(K$6:K12))))
org.apache.poi.ss.usermodel.CellValue [""]

这与 Excel 的计算结果相同。

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