How to get the page count of a microsoft word document in java?

If the documents are modern Word 2007 format you can use direct XML-based manipulation, through OOXML. This is by far the better long term solution, though I realize it may not be realistic for an entire organization to change overnight.

If they are older Word formats, you're probably stuck with server-side Word/Excel/Powerpoint/Outlook programmable object models, although you're not supposed to do that on the server..

Regarding Office Open XML support, the latest beta of Java-POI is supposed to support it.

Haven't used it before but you could try Apache POI. Looks like it has a WordCount function.

//Open the Word Document

Document doc = new Document("C:\\Temp\\file.doc"); 

//Get page count

int pageCount = doc.getPageCount();

To read the page count of MS Office files you can use aspose libraries (aspose-words, aspose-cells, aspose-slides).

Examples:

Excel: number of pages of the printable version of the Woorkbook:

   import com.aspose.cells.*;
   public int getPageCount(String filePath) throws Exception {
        Workbook book = new Workbook(filePath);
        ImageOrPrintOptions imageOrPrintOptions = new ImageOrPrintOptions();
//        Default       0   Prints all pages.
//        IgnoreBlank   1   Don't print the pages which the cells are blank.
//        IgnoreStyle   2   Don't print the pages which cells only contain styles.
        imageOrPrintOptions.setPrintingPage(PrintingPageType.IGNORE_STYLE);

        int pageCount = 0;
        for (int i = 0; i < book.getWorksheets().getCount(); i++) {
            Worksheet sheet = book.getWorksheets().get(i);

            PageSetup pageSetup = sheet.getPageSetup();

            pageSetup.setOrientation(PageOrientationType.PORTRAIT);

            pageSetup.setPaperSize(PaperSizeType.PAPER_LETTER);

            pageSetup.setTopMarginInch(1);
            pageSetup.setBottomMarginInch(1);
            pageSetup.setRightMarginInch(1);
            pageSetup.setLeftMarginInch(1);

            SheetRender sheetRender = new SheetRender(sheet, imageOrPrintOptions);

            int sheetPageCount = sheetRender.getPageCount();
            pageCount += sheetPageCount;
        }
        return pageCount;
    }

Word: number of pages:

import com.aspose.words.Document;
public int getPageCount(String filePath) throws Exception {
     Document document = new Document(filePath);
     return document.getPageCount();
 }

PowerPoint: number of slides:

import com.aspose.slides.*;
public int getPageCount(String filePath) throws Exception {
     Presentation presentation = new Presentation(filePath);
     return presentation.getSlides().toArray().length;
 }