Develop Reference

How can i change text orientation in XWPFDocument?

I am working right now in producing word documents in java and i am using XWPFDocument of POI Apache. The final document must looks like this
http://sk.uploads.im/t/rtwvm.png
till no everything works fine, I created table, managed to merge cells but i can not find a way to change the text orientation in table cells. I simply want "Type 1" to be upward.
I only found a solution using cellStyle which seems to work only in excel and not in word, which i am using.

You probably need to create two documents in Word, one with the normal orientation and one with the changed one, then unzip them (.docx is actually a Zip-File) and analyze which xml-structure is responsible for this.
Then you can check if POI already offers higher level APIs for these or if you need to access the low-level POI classes via the getCTxxx() methods, e.g. XWPFTableCell.getCTTc() returns the underlying XML structure and allows you to do things that are not possible via the normal POI interfaces.

You can use something like: cell.getCTTc().getTcPr().addNewTextDirection().setVal(STTextDirection.BT_LR),
where the parameters are found in: STTextDirection.
The problem I couldn't solve yet is that the row height does not update automatically to the vertical text length, then the text is not completely showed. If you solve it, please, post here.

Reading excel data from multiple related excel sheets and dumping in java classes

I have an excel file which contain multiple sheets. I want to relate these sheets with each other Ex.
Here master is the root table, I will read the last column, if the names in it matches with the any tab name I will read the tab .
and atlast I will dump the data in some java classes which will represent these excel sheets.
So when i will use the data in code it will be get by. Master.Polygon.Cord etc.
Please suggest a way for it using POI .

You can use a combination of getSheetIndex(name) and getSheetAt(index) using the HSSFWorkbook class
http://poi.apache.org/apidocs/index.html

You can use
if(workbook.getSheet(cell.toString())!=null){
sheet=wb.getSheet(cell.toString());
//code after getting the sheet
}

I think you gave up too early. Whenever you are doing development the documentation is your best friend. You can always look at few examples. Its a straight forward task you just have to load the excel file and extract sheet by sheet and perform you task. You can also look on some tutorials for jxl they are very similar for beginners.

Using Apache POI HSSF, how can I refresh all formula cells at once?

I am filling cells of an Excel file using Apache POI, and there are a lot of formula cells in the document. However, their values are not refreshed when I open the document in Excel.
It's my understanding that I need to use a FormulaEvaluator to refresh formula cells. Is there a way, though, to update all formula cells at once? There are a lot of them, and while making an exhaustive list is not out of question, it's certainly not something I'm very willing to do.

Sure. Refreshing all the formulas in a workbook is possibly the more typical use case anyway.
If you're using HSSF, call evaluatorAllFormulaCells:
HSSFFormulaEvaluator.evaluateAllFormulaCells(hssfWorkbook)
If you're using XSSF, call evaluatorAllFormulaCells:
XSSFFormulaEvaluator.evaluateAllFormulaCells(xssfWorkbook)
More details are available on the poi website

wb.setForceFormulaRecalculation(true);
// replace "wb" with your HSSFWorkbook/XSSFWorkbook object
https://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/HSSFWorkbook.html#setForceFormulaRecalculation-boolean-
https://poi.apache.org/apidocs/org/apache/poi/xssf/usermodel/XSSFWorkbook.html#setForceFormulaRecalculation-boolean-

Groovy - writing and formatting excel 2010

What are th options for working with an excel workbook from within a groovy (java) environment? We would like to be able to use the following features
add sheets
add cells: headings and data
format columns, rows, cells
and potentially
form pivot tables
copy the pivot table by value
paste clipboard by value on another screen
Essentially this will allow us to forma pivot table but remove the underlying data from the worksheet.
Thoughts? Thanks in advance.

Try apache poi. Can definitely perform your first list of requirements. I have used this api a good bit. If you have any questions, please feel free to ask.

Several Java libraries are available to handle the requirements you're looking for:
Apache POI
OpenOffice API
JExcelAPI
Jacob
...
Not sure which one can easily handle pivot tables.
Good luck with your project!
Wim

This page describes some more Groovy-specific options, but my recommendation would be to use Apache POI, either from Java or Groovy

POI and Excel Lists or Tables

There is a requirement to read multiple Excel "Lists" from one sheet in an Excel file.
I need to know if there is an inbuilt method/api to obtain the dimensions of a list or deal with list specific data. At the bare minimum, is there a way of knowing the "headers" of the list and the number of rows contained in the list data?
I want the POI wrapper that I am writing to be aware of the data elements on the excel, rather than being told through properties/constants or worse; hardcoding the names of the headers/size of the list.
Regards, Vinu
PS: No idea whether the question made any sense...but anyone who gets my drift...please!

I've just written something to do this. AFAIK, Poi itself doesn't understand lists/tables, but you can easily write a wrapper that does. Alternatively, there is the jxls project - this allows complex mappings from POJOs to spreadsheets, and has table reader functionality.
How to: Excel Files has a number of links to projects that might be useful, including an Excel JDBC driver.