使用Excel中的公式结果java jxl api

Question

我想在Excel中使用公式的结果来划分其他单元格。我的代码如下：

import java.io.File; 

import jxl.*; 
import jxl.write.*; 

public class CreateExcel 
{ 

public static void main(String[] args) throws Exception 
{ 
    Workbook workbook = Workbook.getWorkbook(new File("USA-IO-2005.xls")); 
    WritableWorkbook copy = Workbook.createWorkbook(new File("output.xls"), 
     workbook); 
    copy.removeSheet(0); 
    copy.removeSheet(2); 
    WritableSheet domesticSheet = copy.getSheet(1); 
    WritableSheet ASheet = copy.getSheet(0); 

    for (int i = 8; i < 68; i++) 
    { 
    Formula f = new Formula(59, i - 1, "SUM(AX" + i + ":BE" + i 
      + ") - BF" + i); 
    domesticSheet.addCell(f); 
    } 

    double x; 
    for (int i = 8; i < 68; i++) 
    { 
    NumberFormulaCell newCell = (NumberFormulaCell) domesticSheet.getCell(59, i); 
    x = newCell.getValue(); 
    ASheet.addCell(new Label(1, i, String.valueOf(Double 
      .valueOf(domesticSheet.getCell(1, i).getContents())/x))); 
    } 
    copy.write(); 
    copy.close(); 
} 
} 

很不幸，这是给我以下异常：在线程

异常“主要” java.lang.ClassCastException：jxl.write.Formula不能转换为jxl.NumberFormulaCell 在CreateExcel.main（CreateExcel.java:31）

有谁知道这是怎么应该做？

编辑：

这是我修改后的代码基本上没有我想要它做的只是在一个更长的路是什么。我计算什么公式f的输出将等于并保持，而不是直接访问公式的结果。

import java.io.File; 

import jxl.*; 
import jxl.write.*; 
import jxl.write.Number; 
import jxl.SheetSettings; 

public class CreateExcel 
{ 

public static void main(String[] args) throws Exception 
{ 
    Workbook workbook = Workbook.getWorkbook(new File("USA-IO-2005.xls")); 
    WritableWorkbook copy = Workbook.createWorkbook(new File("output.xls"), workbook); 
    copy.removeSheet(3); 
    WritableSheet domesticSheet = copy.getSheet(2); 
    WritableSheet ASheet = copy.getSheet(1); 
    WritableSheet RDSheet = copy.getSheet(0); 
    ASheet.setName("A Matrix"); 
    double x = 1; 
    double[] xVals = new double[60]; 



    //WritableCellFormat cellFormat = new WritableCellFormat(new NumberFormat("#.########")); 
    WritableCellFormat arial8format = new WritableCellFormat (new WritableFont(WritableFont.ARIAL, 8)); 
    ASheet.addCell(new Label(1, 3, "A Matrix", arial8format)); 

    for (int i = 8; i < 56; i++) 
    { 

    //Workaround: Gets the same result as formula f. Just wont update as numbers in excel are changed in the future 
    for (int j = 49; j < 57; j++) 
     xVals[i - 8] += Double.valueOf(domesticSheet.getCell(j, i - 1).getContents()); 
    xVals[i - 8] -= Double.valueOf(domesticSheet.getCell(57, i - 1).getContents()); 

    Number num = new Number(60, i - 1, xVals[i - 8], arial8format); 
    Formula f = new Formula(59, i - 1, "SUM(AX" + i + ":BE" + i + ") - BF" + i, arial8format); 
    domesticSheet.addCell(f); 
    domesticSheet.addCell(num); 

    for (int j = 1; j < 49; j++) 
    { 
     ASheet.setColumnView(j, 10); 
     if (xVals[i - 8] != 0) 
      x = Double.valueOf(domesticSheet.getCell(j, i - 1).getContents())/xVals[i - 8]; 
     else 
      x = 0; 
     ASheet.addCell(new Number(j, i - 1, x, arial8format)); 
    } 

    } 

    SheetSettings s = new SheetSettings(ASheet); 
    s.setVerticalFreeze(1); 
    s.setHorizontalFreeze(1); 

    ASheet.removeRow(55); 
    ASheet.removeRow(56); 
    for(int i = 0; i < 6; i ++) 
    ASheet.removeRow(0); 

    domesticSheet.removeRow(55); 
    domesticSheet.removeRow(56); 
    for(int i = 0; i < 6; i ++) 
    domesticSheet.removeRow(0); 

    copy.write(); 
    copy.close(); 
} 
} 

Answer 1

唯一的例外是明确的，你不能施放方法getCell()的回归NumberFormulaCell，它返回Cell接口。它们是不同的界面。我在下面有源代码更改，我没有你的Excel源文件，所以不能真正测试它，但该类抛出异常现在不应该是一个问题。在没有原始excel源文件的情况下，在下面的这些更改中，与Sheet.addCell相关的行会在我的工作站上发生异常，但这与您所报告的问题完全不同。希望它能在你的最终结果。

import java.io.File; 

import jxl.*; 
import jxl.write.*; 

public class CreateExcel 
{ 

    public static void main(String[] args) throws Exception 
    { 
     Workbook workbook = Workbook.getWorkbook(new File("USA-IO-2005.xls")); 
     WritableWorkbook copy = Workbook.createWorkbook(new File("output.xls"), workbook); 
     copy.removeSheet(0); 
     copy.removeSheet(2); 
     WritableSheet domesticSheet = copy.getSheet(1); 
     WritableSheet ASheet = copy.getSheet(0); 

     for (int i = 8; i < 68; i++) 
     { 
      Formula f = new Formula(59, i - 1, "SUM(AX" + i + ":BE" + i + ") - BF" + i); 
      domesticSheet.addCell(f); 
     } 

     double x = 1; 
     for (int i = 8; i < 68; i++) 
     { 
      Cell cell1 = domesticSheet.getCell(3, i); 

      if (cell1.getType() == CellType.ERROR) 
      { 
       System.out.println("this cell is not exist!"); 
      } 

      if (cell1.getType() == CellType.NUMBER) 
      { 
       NumberCell nc = (NumberCell)cell1; 
       x = nc.getValue(); 
       System.out.println(x); 
       ASheet.addCell(new Label(1, i, String.valueOf(Double.valueOf(domesticSheet.getCell(1, i).getContents())/x))); 
      }       
     } 
     copy.write(); 
     copy.close(); 
    } 
} 

Answer 2

那么，没有输入CellType.Number的情况下，原因是公式单元格不是数字单元格。这是一个公式单元格。它除了公式本身之外没有任何“价值”（解析函数名称来标记它们，但未评估）。它返回CellType.ERROR（至少在jxl 2.6.9中）。该库创建单元格的Excel文件，它不评估任何公式，甚至检查它的有效语法。它只是解析它们的函数名称（令牌），所以函数名称的I18N起作用。 当从Excel读取式细胞文件已经打开，计算并用Excel保存，则foumula电池具有CellType.NUMBER_FORMULA并实现接口读取二者，式和式结果（通过Excel作为评价）。

您不能创建公式单元格，将它添加到工作表，然后立即读取结果。