How to check is there any embedded object exist in .doc files?

Question

I have done for .docx files as below but for .doc file it is throwing InvalidFormatException.

public boolean checkForEmbeddedObj(File wordFile){

   InputStream inStream = new FileInputStream(wordFile);
   XWPFDocument xwDoc = new XWPFDocument(inStream );
   return xwDoc.getAllEmbedds().isEmpty();
}

Any idea How can I do the same for .doc files ?

Answer 1

DOCX and DOC file have different specs and they are implemented differently in Apache POI.

DOCX files:

• use poi-ooxml library and XWPFDocument class

DOC files

• use poi-scratchpad library and HWPFDocument class

OLD Doc files

• use poi-scratchpad library and HWPFOldDocument class

In order to extract embedded data from doc file, you can use OLE2ExtractorFactory.getEmbededDocsTextExtractors as following:

import org.apache.poi.extractor.OLE2ExtractorFactory;
import org.apache.poi.extractor.POITextExtractor;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.extractor.WordExtractor;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

    void hwpfExtractor(File wordFile) throws IOException {

        HWPFDocument doc = new HWPFDocument(new FileInputStream(wordFile));

        POITextExtractor[] embeddedExtractors = OLE2ExtractorFactory.getEmbededDocsTextExtractors(new WordExtractor(doc));

        for (POITextExtractor ext : embeddedExtractors) {

            //ext could be one of the instance of org.apache.poi.extractor.POITextExtractor
            if (ext instanceof XXX) {
                // do stuff

            }


        }
    }

See also:

• How to read doc and docx file in java with POI api
• https://poi.apache.org/text-extraction.html