java - 如何使用 poi 更新 Excel 工作表链接

Question

我正在尝试在使用 setForceFormulaRecal 方法后获取更新的单元格值。但我仍然有旧的值(value)观。这不是实际结果。如果我通过单击打开原始文件，它将询问更新链接对话框。如果我单击“确定”按钮，则会更新所有单元格公式结果。所以我想在打开之前使用 poi 更新 excel 工作表链接。请在这种情况下提供帮助。

//设置值之前

HSSFCell cel2=row1.getCell(2);
HSSFCell cel4=row1.getCell(5);
cel2.setCellValue(690);
cel4.setCellValue(690);
wb.setForceFormulaRecalculation(true);
wb.write(stream);

//在评估我正在尝试的工作簿公式之后

 HSSFWorkbook wb = HSSFReadWrite.readFile("D://workspace//ExcelProject//other.xls");
   HSSFSheet sheet=wb.getSheetAt(14);
   HSSFRow row11=sheet.getRow(10);
   System.out.println("** cell val: "+row11.getCell(3).getNumericCellValue());

我也试过使用 Formula Evaluator 但它显示的错误如下

Could not resolve external workbook name '\Users\asus\Downloads\??? & ???? ?????_091230.xls'. Workbook environment has not been set up.
    at org.apache.poi.ss.formula.OperationEvaluationContext.createExternSheetRefEvaluator(OperationEvaluationContext.java:87)
    at org.apache.poi.ss.formula.OperationEvaluationContext.getArea3DEval(OperationEvaluationContext.java:273)
    at org.apache.poi.ss.formula.WorkbookEvaluator.getEvalForPtg(WorkbookEvaluator.java:660)
    at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:527)
    at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:288)
    at org.apache.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:230)
    at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateFormulaCellValue(HSSFFormulaEvaluator.java:351)
    at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateFormulaCell(HSSFFormulaEvaluator.java:213)
    at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateAllFormulaCells(HSSFFormulaEvaluator.java:324)
    at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateAll(HSSFFormulaEvaluator.java:343)
    at HSSFReadWrite.readSheetData(HSSFReadWrite.java:85)
    at HSSFReadWrite.main(HSSFReadWrite.java:346)
Caused by: org.apache.poi.ss.formula.CollaboratingWorkbooksEnvironment$WorkbookNotFoundException: Could not resolve external workbook name '\Users\asus\Downloads\??? & ???? ?????_091230.xls'. Workbook environment has not been set up.
    at org.apache.poi.ss.formula.CollaboratingWorkbooksEnvironment.getWorkbookEvaluator(CollaboratingWorkbooksEnvironment.java:161)
    at org.apache.poi.ss.formula.WorkbookEvaluator.getOtherWorkbookEvaluator(WorkbookEvaluator.java:181)
    at org.apache.poi.ss.formula.OperationEvaluationContext.createExternSheetRefEvaluator(OperationEvaluationContext.java:85)
    ... 11 more

Answer 1

好的，尝试回答:

首先:当前稳定版本 3.10 中不支持外部工作簿链接。因此，使用此版本无法直接评估此类链接。这就是为什么 evaluateAll() 对于带有外部工作簿链接的工作簿会失败。

有了 3.11 版，就可以做到这一点。但也只有在打开所有工作簿并且所有工作簿的评估程序都存在的情况下。请参阅:http://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/FormulaEvaluator.html#setupReferencedWorkbooks%28java.util.Map%29

我们可以使用稳定版 3.10 来评估所有包含没有链接到外部工作簿的公式的单元格。

例子:

工作簿“workbook.xlsx”包含一个带有指向 A2 中外部工作簿的链接的公式:

import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;

import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStream;

import java.util.Map;
import java.util.HashMap;

class ExternalReferenceTest {

 public static void main(String[] args) {
  try {

   InputStream inp = new FileInputStream("workbook.xlsx");
   Workbook wb = WorkbookFactory.create(inp);

   Sheet sheet = wb.getSheetAt(0);

   Row row = sheet.getRow(0);
   if (row == null) row = sheet.createRow(0);

   Cell cell = row.getCell(0);
   if (cell == null) cell = row.createCell(0);
   cell.setCellValue(123.45);

   cell = row.getCell(1);
   if (cell == null) cell = row.createCell(1);
   cell.setCellValue(678.90);

   cell = row.getCell(2);
   if (cell == null) cell = row.createCell(2);
   cell.setCellFormula("A1+B1");

   FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
   //evaluator.evaluateAll(); //will not work because external workbook for formula in A2 is not accessable
   System.out.println(sheet.getRow(1).getCell(0)); //[1]Sheet1!$A$1

   //but we surely can evaluate single cells:
   cell = wb.getSheetAt(0).getRow(0).getCell(2);
   System.out.println(evaluator.evaluate(cell).getNumberValue()); //802.35

   FileOutputStream fileOut = new FileOutputStream("workbook.xlsx");
   wb.write(fileOut);
   fileOut.flush();
   fileOut.close();

  } catch (InvalidFormatException ifex) {
  } catch (FileNotFoundException fnfex) {
  } catch (IOException ioex) {
  }
 }
}