I am trying to update an existing Excel file with many formulas.
I can't use evaluate-function ( Excel-file contains a function not
supported by Apache POI)
How can I delete the cached results from the file, before I save new file?
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;
public class POITestRB {
static String excelFileOrig = "C:/Test/1.xlsm";
static String excelFileNew = "C:/Test/excelFileNew.xlsm";
static FileInputStream fis;
static XSSFWorkbook workbook;
public static void main(String[] args) throws IOException {
fis = new FileInputStream(excelFileOrig);
workbook = new XSSFWorkbook(fis);
gettingCellContents(workbook, "D5");
updateCell(workbook, 10.0);
fis.close();
workbook.close();
fis = new FileInputStream(excelFileNew);
workbook = new XSSFWorkbook(fis);
gettingCellContents(workbook, "D5");
fis.close();
workbook.close();
}
public static void updateCell(XSSFWorkbook workbook, Double newData) {
try {
XSSFSheet sheet = workbook.getSheetAt(1);
CellReference ref = new CellReference("C8");
int row = ref.getRow();
int col = ref.getCol();
Cell cell = sheet.getRow(row).getCell(col);
if (cell != null) {
cell.setCellValue(newData);
}
workbook.getCreationHelper().createFormulaEvaluator().clearAllCachedResultValues();
//
workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();
OutputStream os = new FileOutputStream(excelFileNew);
workbook.write(os);
os.flush();
os.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
private static void gettingCellContents(XSSFWorkbook workbook, String
cellId) {
workbook.setForceFormulaRecalculation(true);
XSSFSheet sheet = workbook.getSheetAt(1);
CellReference ref = new CellReference(cellId);
int row = ref.getRow();
int col = ref.getCol();
Cell cell = sheet.getRow(row).getCell(col);
switch (cell.getCellTypeEnum()) {
case STRING:
System.out.println(cell.getRichStringCellValue().getString());
break;
case NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
System.out.println(cell.getDateCellValue());
} else {
System.out.println(cell.getNumericCellValue());
}
break;
case BOOLEAN:
System.out.println(cell.getBooleanCellValue());
break;
case FORMULA:
System.out.println("Formula is: " + cell.getCellFormula());
System.out.println("cell.getCachedFormulaResultType(): " +
cell.getCachedFormulaResultType());
switch(cell.getCachedFormulaResultType()) {
case Cell.CELL_TYPE_NUMERIC:
System.out.println("0. case Cell.CELL_TYPE_NUMERIC
--> Last evaluated as: " + cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING:
System.out.println("4. case Cell.CELL_TYPE_STRING
--> Last evaluated as \"" + cell.getRichStringCellValue() + "\"");
break;
case Cell.CELL_TYPE_ERROR:
System.out.println("5. case Cell.CELL_TYPE_ERROR -->
");
break;
}
break;
case BLANK:
System.out.println();
break;
default:
System.out.println("default");
}
}
}
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