How to set formulas in cells using Apache POI?

问题

I am currently using Apache POI for Java to set formulas in cells.

But after I run the program and open the Excel file that I created and processed, the cells with the formula include the formula as a string, rather than the value the formula should have returned.

回答1:

The HSSFCell object has methods .setCellType and .setCellFormula which you need to call like this:

// "cell" object previously created or looked up
String strFormula= "SUM(A1:A10)";
cell.setCellType(HSSFCell.CELL_TYPE_FORMULA);
cell.setCellFormula(strFormula);

回答2:

The below code worked fine for me, hope this could be useful to someone.

cell.setCellType(Cell.CELL_TYPE_FORMULA);
cell.setCellFormula("SUM(C70:C76)");

回答3:

Cell Constants are deprecated and will be removed from version 4.0 instead of Cell Use

CellType.FORMULA

String formula= "SUM(B4:B20)";
cell.setCellType(CellType.FORMULA);
cell.setCellFormula(formula);

回答4:

Apache POI does not support user-defined functions.

From the documentation:

Note that user-defined functions are not supported, and is not likely to done any time soon... at least, not till there is a VB implementation in Java!

回答5:

You could use this to evaluate the formulas in the workbook:

        // Evaluate all formulas in the sheet, to update their value
    FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
    formulaEvaluator.evaluateAll();

回答6:

I was having the similar problem and "SUM(B4:B20)" does not work for me directly as the sheet was generated dynamically. The problem was with the cell reference.

On the basis of https://stackoverflow.com/a/2339262/2437655 and https://stackoverflow.com/a/33098060/2437655 I was able to generate the actual formula. e.g.

 val totalProductQtyPerUserCell = userDetailsRow.createCell(products.size + 1)
 totalProductQtyPerUserCell.cellType = HSSFCell.CELL_TYPE_FORMULA
 totalProductQtyPerUserCell.cellFormula = "SUM(${CellReference.convertNumToColString(1)}${totalProductQtyPerUserCell.row.rowNum + 1}:${CellReference.convertNumToColString(products.size)}${totalProductQtyPerUserCell.row.rowNum + 1})"

Hope that help.

来源：https://stackoverflow.com/questions/2339238/how-to-set-formulas-in-cells-using-apache-poi

标签

java

apache-poi