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In this tutorial we will use Apache POI library to perform different functions on Microsoft Excel spreadsheet.
To read an excel file, Apache POI provides certain easy-to-use APIs.
If you’re looking to use Realm from Objective‑C, or from mixed Objective‑C & Swift apps, please see Realm Objective‑C instead.
The Realm Objective‑C and Realm Swift APIs are not interoperable and using them together is not supported.
However, please be mindful that tv OS can purge files in the “Caches” directory at any point, so we encourage you to rely on Realm as a rebuildable cache rather than storing important user data.
If you would like to share a Realm file between a tv OS app and a TV services extension (e.g.
File Input Stream file = new File Input Stream(new File("C:\test.xlsx")); //Get the workbook instance for XLS file XSSFWorkbook workbook = new XSSFWorkbook (file); //Get first sheet from the workbook XSSFSheet sheet = Sheet At(0); //Get iterator to all the rows in current sheet Iteratorimport org.hssf.usermodel. Open the excel using different API that we discussed above and set the cell’s value.
HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.create Sheet("Sample sheet"); //Create a new row in current sheet Row row = sheet.create Row(0); //Create a new cell in current row Cell cell = row.create Cell(0); //Set value to new value Cell Value("Blahblah"); Updating an existing excel file is straight forward.
The name POI was originally an acronym for Poor Obfuscation Implementation, referring humorously to the fact that the file formats seemed to be deliberately obfuscated, but poorly, since they were successfully reverse-engineered. File Input Stream file = new File Input Stream(new File("C:\test.xls")); //Get the workbook instance for XLS file HSSFWorkbook workbook = new HSSFWorkbook(file); //Get first sheet from the workbook HSSFSheet sheet = Sheet At(0); //Get iterator to all the rows in current sheet Iterator Notice how each class in POI library starts with HSSF prefix! In order to handle this, it is necessary to ensure that the file protection attributes applied to both the Realm file itself and its auxiliary files is downgraded to a less strict one that allows file access even when the device is locked, such as .If you choose to opt out of complete i OS file encryption in this way, we encourage you to use Realm’s own built-in encryption to ensure your data is still properly secured.No data is actually written to the files unless the operating system needs to swap to disk due to memory pressure.instance could sometimes fail if resources are constrained.