Java program to evaluate formula in an excel file using Apache POI library. Similarly, we want to read a file with formula cells and use the following logic to evaluate formula cells. ("Excel with foumula cells written successfully") Header.createCell(3).setCellValue("Interest (P r t)") ĭataRow.createCell(0).setCellValue(14500d) ĭataRow.createCell(1).setCellValue(9.25) ĭataRow.createCell(3).setCellFormula("A2*B2*C2") įileOutputStream out = new FileOutputStream(new File("formulaDemo.xlsx")) Header.createCell(1).setCellValue("RoI") Header.createCell(0).setCellValue("Pricipal") XSSFSheet sheet = workbook.createSheet("Calculate Simple Interest") Java program to add formula in an excel file using Apache POI library. So the formula will be: A2*B2*C2 (in the second row) The sheet has four cells in a row and the fourth one in the multiplication of all the previous 3 rows. Let’s see one example of how to add formula cells in excel? Apache POI also has excellent support for adding formula cells and evaluating already present formula cells. When working on complex excel sheets, we encounter many cells with formulas to calculate their values. See Also: Apache POI – Read an Excel File using SAX Parser Check the cell type and format accordingly Iterator cellIterator = row.cellIterator() For each row, iterate through all the columns XSSFSheet sheet = workbook.getSheetAt(0) Get first/desired sheet from the workbook XSSFWorkbook workbook = new XSSFWorkbook(file) Create Workbook instance holding reference to. package įileInputStream file = new FileInputStream(new File("howtodoinjava_demo.xlsx")) Java program to read an excel file using Apache POI library. It will read all the column names and the values in it – cell by cell. I am writing the code to read the excel file created in the above example. repeat steps 3 and 4 until all data is read.Create workbook instance from an excel sheet.Reading an excel file using POI is also very simple if we divide this into steps. ("howtodoinjava_demo.xlsx written successfully on disk.") This data needs to be written (Object)ĭata.put("1", new Object ) įileOutputStream out = new FileOutputStream(new File("howtodoinjava_demo.xlsx")) XSSFSheet sheet = workbook.createSheet("Employee Data") XSSFWorkbook workbook = new XSSFWorkbook() Java program to write an excel file using Apache POI library. It seems very simple, right? Let’s have a look at the code doing these steps. Repeat steps 3 and 4 to write more data.Writing excel using POI is very simple and involves the following steps: I am taking this example first so we can reuse the excel sheet created by this code in further examples. are used when you have to add formatting to a sheet, primarily based on some rules.Īnother helpful class FormulaEvaluator is used to evaluate the formula cells in an excel sheet. SXSSF achieves its low memory footprint by limiting access to the rows within a sliding window, while XSSF gives access to all rows in the document.Īpart from the above classes, Row and Cell interact with a particular row and a particular cell in an excel sheet.Ī wide range of classes like CellStyle, BuiltinFormats, ComparisonOperator, ConditionalFormattingRule, FontFormatting, IndexedColors, PatternFormatting, SheetConditionalFormatting etc. SXSSF (since 3.8-beta3) – is an API-compatible streaming extension of XSSF to be used when huge spreadsheets have to be produced and heap space is limited.XSSF – is the POI Project’s pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.HSSF – is the POI Project’s pure Java implementation of the Excel 97(-2007) file format.Apache POI main classes usually start with either HSSF, XSSF or SXSSF.
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