After a workbook is created, you can open the workbook to incorporate modifications, save the changes back to the workbook and protect it with a password in order to ensure security.

This topic includes the following tasks:

• Open a workbook
• Save a workbook

Open a workbook

You can open an existing workbook by calling the open method of the Workbook class.

While opening a workbook, you can also choose from several import options listed in the below table:

Refer to the following example code in order to open a workbook.

// Opening a workbook
workbook.open("OpenWorkbook.xlsx");
        
// Opening a workbook with Import options
        
// Import only data from .xlsx document
XlsxOpenOptions options = new XlsxOpenOptions();
options.setImportFlags(EnumSet.of(ImportFlags.Data));
workbook.open("OpenWorkbookWithOptions.xlsx", options);
        
// Don't recalculate after opened.
options.setDoNotRecalculateAfterOpened(true);

//Don't autofit row height
options.setDoNotAutoFitAfterOpened(true);

Apart from .xlsx files, you can also open the below file formats by using the overloads of open method in Workbook class:

• .xlsm
• .xltx
• .csv
• .json
• .ssjson
• .sjs

However, an exception is thrown when unsupported file formats are opened. While opening a JSON file, the DeserializationOptions are supported as well.

Refer to the following example code to open a JSON file with and without options.

//create a new workbook
Workbook workbook = new Workbook();
        
// Import JSON without options
workbook.open("spread_js_exported.json");

// Import JSON with options
DeserializationOptions options = new DeserializationOptions();
options.setIgnoreStyle(true);
workbook.open("spread_js_exported.json", options);

Save a workbook

You can save the changes made in the existing workbook by calling the save method of the Workbook class.

Refer to the following example code to save your workbook.

// Saving an excel file (.xlsx document)
workbook.save("SaveExcel.xlsx");
        
// Saving an excel file with saveFileFormat
workbook.save("SaveExcelWithFormat.xlsx", SaveFileFormat.Xlsx);
        
// Saving an excel file while setting password
XlsxSaveOptions options = new XlsxSaveOptions();
options.setPassword("123456");
workbook.save("SaveExcelWithPassword.xlsx", options);

Sometimes workbook may contain many unused styles, unused defined names, or empty cells with styles applied on it which increases the file size. The XlsxSaveOptions class provides you with options to save .xlsx files without these unnecessary items so that you can optimize the file size. The setExcludeEmptyRegionCells method of the class, when set to true, lets you exclude the empty cells outside the used data range. Similarly, you can exclude the unused names and styles of a workbook while exporting by setting the setExcludeUnusedNames and setExcludeUnusedStyles method to true. The class also provides setIgnoreFormula method which lets you save the formula cells as value cells in the saved .xlsx file. You can even save the workbook in compact mode if you want a smaller file size after saving it by using the setIsCompactMode method.

The sample code below shows how to save your workbook using various options:

        // Create a new workbook
        Workbook workbook = new Workbook();
InputStream fileStream = getResourceStream("xlsx/file needs to be optimized.xlsx");
workbook.open(fileStream);

XlsxSaveOptions options = new XlsxSaveOptions();
options.setExcludeEmptyRegionCells(true);
options.setExcludeUnusedStyles(true);
options.setExcludeUnusedNames(true);

workbook.save(outputStream, options);

Apart from saving files in .xlsx format, you can also save files in the below file formats by using the overloads of Save method in Workbook class:

• .xlsm
• .xltx
• .csv
• .html
• .pdf
• .json
• .ssjson
• .sjs

To view the feature in action, see Option to optimize file size demo.