Need help regarding array formulas implementation in apache poi api

问题

I got allocated updation of existing project. Previous developer used jcom api to export data to excel sheets. But jcom api don't work with 64 bit systems. I decided to change code and using apache poi api. I managed to done many methods. My problem is array formulas. I Need to implement array formulas using apache poi. Those formulas are posted below, any help will be more appreciable. Thanks in advance guys.

Formulas:

String  formula1 = "SUM(R[-2]C/1.200)";//net income  calculation from gross income
String  formula2 = "SUM(R[-1]C-R[1]C)";
String  formula3 = "SUM(R[-" + Integer.toString(listTypeTotals.size()+1) + "]C:R[-2]C)";

I tried to set that cell as formulatype and passing formula as string.

setCellFormulaStyle(sheet, 4, i+2, formula2);

 public static void setCellFormulaStyle(HSSFSheet sheet,int row, int column,String value)
  {
    HSSFRow temprow = null;
    temprow =getRow_CreateRow(sheet, row);
    temprow.createCell(column).setCellFormula(value);
  }

public static HSSFRow getRow_CreateRow(HSSFSheet sheet,int row)
{
  HSSFRow excelrow=null;
  excelrow = sheet.getRow(row);
  if(excelrow==null)
  {
    excelrow =sheet.createRow(row);
    return excelrow;
  }else
  return excelrow;
}

I am getting following exception

org.apache.poi.ss.formula.FormulaParseException: Specified named range 'R' does not exist in the current workbook.
at org.apache.poi.ss.formula.FormulaParser.parseNonRange(FormulaParser.java:569)
at org.apache.poi.ss.formula.FormulaParser.parseRangeable(FormulaParser.java:517)
at org.apache.poi.ss.formula.FormulaParser.parseRangeExpression(FormulaParser.java:268)
at org.apache.poi.ss.formula.FormulaParser.parseSimpleFactor(FormulaParser.java:1119)
at org.apache.poi.ss.formula.FormulaParser.percentFactor(FormulaParser.java:1079)
at org.apache.poi.ss.formula.FormulaParser.powerFactor(FormulaParser.java:1066)
at org.apache.poi.ss.formula.FormulaParser.Term(FormulaParser.java:1426)
at org.apache.poi.ss.formula.FormulaParser.additiveExpression(FormulaParser.java:1526)
at org.apache.poi.ss.formula.FormulaParser.concatExpression(FormulaParser.java:1510)
at org.apache.poi.ss.formula.FormulaParser.comparisonExpression(FormulaParser.java:1467)
at org.apache.poi.ss.formula.FormulaParser.Arguments(FormulaParser.java:1051)
at org.apache.poi.ss.formula.FormulaParser.function(FormulaParser.java:936)
at org.apache.poi.ss.formula.FormulaParser.parseNonRange(FormulaParser.java:558)
at org.apache.poi.ss.formula.FormulaParser.parseRangeable(FormulaParser.java:429)
at org.apache.poi.ss.formula.FormulaParser.parseRangeExpression(FormulaParser.java:268)
at org.apache.poi.ss.formula.FormulaParser.parseSimpleFactor(FormulaParser.java:1119)
at org.apache.poi.ss.formula.FormulaParser.percentFactor(FormulaParser.java:1079)
at org.apache.poi.ss.formula.FormulaParser.powerFactor(FormulaParser.java:1066)
at org.apache.poi.ss.formula.FormulaParser.Term(FormulaParser.java:1426)
at org.apache.poi.ss.formula.FormulaParser.additiveExpression(FormulaParser.java:1526)
at org.apache.poi.ss.formula.FormulaParser.concatExpression(FormulaParser.java:1510)
at org.apache.poi.ss.formula.FormulaParser.comparisonExpression(FormulaParser.java:1467)
at org.apache.poi.ss.formula.FormulaParser.unionExpression(FormulaParser.java:1447)
at org.apache.poi.ss.formula.FormulaParser.parse(FormulaParser.java:1568)
at org.apache.poi.ss.formula.FormulaParser.parse(FormulaParser.java:176)
at org.apache.poi.hssf.model.HSSFFormulaParser.parse(HSSFFormulaParser.java:72)
at org.apache.poi.hssf.usermodel.HSSFCell.setCellFormula(HSSFCell.java:594)`

回答1:

I am not sure how you have use the formula yet. However if your problem is regarding the dynamic cell reference based on rows and Columns, perhaps I can help you.

For any cell, say "B5", at runtime,

cell.getReference(); 

will give you cell reference (like in example... it will return you "B5"

cell.getReference().toString().charAt(0); 

will give you the Column Reference (will give you "B" if the current cell is B5). Now

cell.getRowIndex(); 

OR

 cell.getReference().toString().charAt(1);

will give you Row Index. I have used that multiple times to update/create the Named ranges and formula on my workbook.

Small Changes to include handling address like AZ89

For the cases of AZ99 we can use for this we can use small hacks like:

String str = cell.getReference();
    for(index = 0;index<str.length();index++){
        if((int)str.charAt(index)<65){
            break;
        }
    }
    String Col = str.substring(0, index);
    String Row = str.substring(index+1, str.length());

来源：https://stackoverflow.com/questions/17422881/need-help-regarding-array-formulas-implementation-in-apache-poi-api