the question is how can i use java to input a csv file and output an xls file
is there any specefic api or lib which can help question gonna help so why it s error on opening a sheet
FileOutputStream fos = new FileOutputStream(outputFile);
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
workbook.setMissingCellPolicy(Row.CREATE_NULL_AS_BLANK);
HSSFSheet sheet = workbook.getSheetAt(0);
after i tried i think it s due to a memor problem idk
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I would like to be able to open Excel file of arbotrary type. Is it possible to select between HSSFWorkbook and XSSFWorkbook automatically?
Currently I write
Workbook workbook = new HSSFWorkbook(excelFile);
Can I write universal?
Yes! All you need to do is use WorkbookFactory
As per this part of the docs, it's better to use a File than an InputStream. So, just do something like:
File file = new File("input.xls");
Workbook wb = WorkbookFactory.create(file);
That will create whichever of HSSFWorkbook or XSSFWorkbook your file needs
I have an excel file with over 1 million rows (about 60 MB) and I want to read them using java , I have the following code to read :
FileInputStream file = new FileInputStream(
new File(
"path/file.xlsx"));
XSSFWorkbook workbook = new XSSFWorkbook(file);
XSSFSheet sheet = workbook.getSheetAt(0);
at creating workbook line it takes forever I tried it on small files it work perfectly but with this file it takes more than an hour and nothing !
what is the best way to read file like this ?
I created an .xlsx file using selenium through File "fil.createNewFile()", the file got created in the location but when i try to open the file i am getting a message "Excel cannot open the file 'Example.xlsx' because the file format or file extension is not valid....". Why is this happening. Please guide me to over come this problem.
Thanks in advance...
What eltabo mentioned is correct. Below is a code sample from Apache POI which will create a blank excel file.
HSSFWorkbook workbook = new HSSFWorkbook();
FileOutputStream out = new FileOutputStream(new File("C:\\new.xls"));
workbook.write(out);
out.close();
I guess you are trying something like:
File fil = new File("Example.xlsx");
fil.createNewFile();
Well, it this is your case you're creating a file with xlsx extension, but it's not truly a Excel file (it's empty). If you try to create a new file using Excel or File Explorer, you can see that a new fresh xlsx file weight about 10kb. If you need to create a Excel file you need to use Apache POI, or another library.
You need to add a sheet at least:
XSSFWorkbook wb = new XSSFWorkbook();
Sheet sheet = wb.createSheet();
FileOutputStream fileOut = new FileOutputStream("Example.xlsx");
wb.write(fileOut);
fileOut.close();
PS: I use poi-ooxml, since you use a xlsx file.
Hope it helps.
I am using Apache poi for generating excel data.It works fine for all cell types except formula type cell.
The excel file with formula type cell when closed even without any changes throws a confirmatiorn like this.
For XLS fomat
http://i40.tinypic.com/126d9uw.jpg
For XLSX format:
http://i40.tinypic.com/126d9uw.jpg
Is there any way to suppress this confirmation.
I tried the below code but it didnt help.
//Workbook wb = WorkbookFactory.create(new FileInputStream(absolutexlsFileName));
FileInputStream fis = new FileInputStream(absolutexlsFileName);
Workbook wb = new XSSFWorkbook(fis);
FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
evaluator.evaluateAll();
OutputStream out = msg.getHttpServletResponse().getOutputStream();
msg.getHttpServletResponse().setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
msg.getHttpServletResponse().setHeader("Expires:", "0"); // eliminates browser caching
msg.getHttpServletResponse().setHeader("Content-Disposition", "attachment; filename="+absolutexlsFileName);
wb.write(out);
out.flush();
out.close();
Looks like your formula changes would cause a cell update somewhere but you don't calculate it (but excel does and thus the change confirmation). You have to evaluate your formulas in order to prevent that warning [1]
[1] http://poi.apache.org/spreadsheet/eval.html
I have file in type xls with xml extension, I want to read it like excel file.
I trying
HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(inputFile));
HSSFSheet sheet = wb.getSheetAt(0);
but it read only with xls extension.
someone know how??
thank
You have to use the XSSF* Classes.
XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
https://poi.apache.org/spreadsheet/index.html
XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(inputFile));
XSSFSheet sheet = wb.getSheetAt(0);