change files location

2020-07-03 23:56:52 +02:00
parent be5c52bd3b
commit 8f22ea5d36
6 changed files with 4 additions and 120 deletions
@@ -0,0 +1,34 @@
+package com.baeldung.poi.excel.setFormula;
+
+import org.apache.poi.ss.usermodel.CellValue;
+import org.apache.poi.xssf.usermodel.XSSFCell;
+import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+
+import java.io.IOException;
+import java.util.List;
+
+public class ExcelFormula {
+    XSSFWorkbook excel;
+    public XSSFSheet inserData(List<Integer> dataList) {
+        excel = new XSSFWorkbook();
+        XSSFSheet sheet = excel.createSheet();
+        int rowNum =0 ;
+        for (Integer data : dataList){
+            sheet.createRow(rowNum++).createCell(0).setCellValue(data);
+        }
+        return sheet;
+    }
+    public double setFormula(String formula) throws IOException {
+        XSSFSheet sheet = excel.getSheetAt(0);
+        int lastCellNum = sheet.getRow(0).getLastCellNum();
+        XSSFCell formulaCell = sheet.getRow(0).createCell(lastCellNum + 1);
+        formulaCell.setCellFormula(formula);
+        XSSFFormulaEvaluator formulaEvaluator = excel.getCreationHelper().createFormulaEvaluator();
+        CellValue evaluate = formulaEvaluator.evaluate(formulaCell);
+        if(excel != null)
+            excel.close();
+        return evaluate.getNumberValue();
+    }
+}
@@ -0,0 +1,29 @@
+package com.baeldung.poi.excel.setFormula;
+
+import org.apache.poi.ss.util.CellReference;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+class ExcelFormulaUnitTest {
+    @Test
+    void givenExcelData_whenSetAndEvaluateFormula() throws IOException {
+        ExcelFormula excelFormula = new ExcelFormula();
+        List<Integer> data = Arrays.asList(2, 5, 10, 15, 7, 9);
+        XSSFSheet sheet = excelFormula.inserData(data);
+        int result = 0;
+        for (int row = 0; row <= sheet.getLastRowNum(); row++) {
+            result += sheet.getRow(row).getCell(0).getNumericCellValue();
+        }
+        String colName = CellReference.convertNumToColString(0);
+        String startCell = colName + 1;
+        String stopCell = colName + (sheet.getLastRowNum() + 1);
+        String sumFormula = String.format("SUM(%s:%s)", startCell, stopCell);
+        int resultValue = (int) excelFormula.setFormula(sumFormula);
+        Assert.assertEquals("The results are the same!", resultValue , result);
+    }
+}