create MS Excel files using Java

add-addin-formula.java

// create a new workbook
Workbook workbook = new Workbook();

// Register macro enabled add-in along with the function name
int id = workbook.getWorksheets().registerAddInFunction("TESTUDF.xlam", "TEST_UDF", false);

// Register more functions in the file (if any)
workbook.getWorksheets().registerAddInFunction(id, "TEST_UDF1"); //in this way you can add more functions that are in the same file

// Access first worksheet
Worksheet worksheet = workbook.getWorksheets().get(0);

// Access first cell
Cell cell = worksheet.getCells().get("A1");

// Set formula name present in the add-in
cell.setFormula("=TEST_UDF()"); 

// Save as Excel XLSX file
workbook.save("Excel.xlsx"); 

add-builtin-formula.java

// Create a new workbook
Workbook workbook = new Workbook();

// Add value in the cell
workbook.getWorksheets().get(0).getCells().get(0).setFormula("=H7*(1+IF(P7 =$L$3,$M$3, (IF(P7=$L$4,$M$4,0))))");

// Save as Excel XLSX file
workbook.save("Excel.xlsx"); 

create-excel-file.java

// Create a new workbook
Workbook workbook = new Workbook();

// Add value in the cell
workbook.getWorksheets().get(0).getCells().get("A1").putValue("Hello World!");

// Save as Excel XLSX file
workbook.save("Excel.xlsx"); 

insert-chart-in-excel.java

// Create a new workbook
Workbook workbook = new Workbook("workbook.xlsx"); 

// Obtaining the reference of the first worksheet
WorksheetCollection worksheets = workbook.getWorksheets();
Worksheet sheet = worksheets.get(0);

// Adding some sample value to cells
Cells cells = sheet.getCells();
Cell cell = cells.get("A1");
cell.setValue(50);
cell = cells.get("A2");
cell.setValue(100);
cell = cells.get("A3");
cell.setValue(150);
cell = cells.get("B1");
cell.setValue(4);
cell = cells.get("B2");
cell.setValue(20);
cell = cells.get("B3");
cell.setValue(50);

// get charts in worksheet
ChartCollection charts = sheet.getCharts();

// Adding a chart to the worksheet
int chartIndex = charts.add(ChartType.PYRAMID, 5, 0, 15, 5);
Chart chart = charts.get(chartIndex);

// Adding NSeries (chart data source) to the chart ranging from "A1"
// cell to "B3"
SeriesCollection serieses = chart.getNSeries();
serieses.add("A1:B3", true);

// Write the Excel file 
workbook.save("Excel_with_Chart.xlsx");

insert-pivottable-in-excel.java

// Create a new workbook
Workbook workbook = new Workbook("workbook.xlsx"); 

// Get the first worksheet.
Worksheet sheet = workbook.getWorksheets().get(0);

// Obtaining Worksheet's cells collection
Cells cells = sheet.getCells();

// Setting the value to the cells
Cell cell = cells.get("A1");
cell.setValue("Sport");
cell = cells.get("B1");
cell.setValue("Quarter");
cell = cells.get("C1");
cell.setValue("Sales");

cell = cells.get("A2");
cell.setValue("Golf");
cell = cells.get("A3");
cell.setValue("Golf");
cell = cells.get("A4");
cell.setValue("Tennis");
cell = cells.get("A5");
cell.setValue("Tennis");
cell = cells.get("A6");
cell.setValue("Tennis");
cell = cells.get("A7");
cell.setValue("Tennis");
cell = cells.get("A8");
cell.setValue("Golf");

cell = cells.get("B2");
cell.setValue("Qtr3");
cell = cells.get("B3");
cell.setValue("Qtr4");
cell = cells.get("B4");
cell.setValue("Qtr3");
cell = cells.get("B5");
cell.setValue("Qtr4");
cell = cells.get("B6");
cell.setValue("Qtr3");
cell = cells.get("B7");
cell.setValue("Qtr4");
cell = cells.get("B8");
cell.setValue("Qtr3");

cell = cells.get("C2");
cell.setValue(1500);
cell = cells.get("C3");
cell.setValue(2000);
cell = cells.get("C4");
cell.setValue(600);
cell = cells.get("C5");
cell.setValue(1500);
cell = cells.get("C6");
cell.setValue(4070);
cell = cells.get("C7");
cell.setValue(5000);
cell = cells.get("C8");
cell.setValue(6430);


PivotTableCollection pivotTables = sheet.getPivotTables();

// Adding a PivotTable to the worksheet
int index = pivotTables.add("=A1:C8", "E3", "PivotTable2");

// Accessing the instance of the newly added PivotTable
PivotTable pivotTable = pivotTables.get(index);

// Unshowing grand totals for rows.
pivotTable.setRowGrand(false);

// Dragging the first field to the row area.
pivotTable.addFieldToArea(PivotFieldType.ROW, 0);

// Dragging the second field to the column area.
pivotTable.addFieldToArea(PivotFieldType.COLUMN, 1);

// Dragging the third field to the data area.
pivotTable.addFieldToArea(PivotFieldType.DATA, 2);

// Write the Excel file 
workbook.save("Excel_with_Chart.xlsx");

update-excel-file.java

// Create a new workbook
Workbook workbook = new Workbook("workbook.xls"); 

// Get the reference of "A1" cell from the cells of a worksheet
Cell cell = workbook.getWorksheets().get(0).getCells().get("A1");

// Set the "Hello World!" value into the "A1" cell
cell.setValue("updated cell value.");

// Write the Excel file
workbook.save("Excel.xls", FileFormatType.EXCEL_97_TO_2003);