Is there any java library (maybe poi?) which allows to merge docx files? [closed]

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I need to write a java application which can merge docx files. Any suggestions?

By "merge," do you mean some simple sort of concatenation? Or something fancier? Is the difficulty the merge part or the docx (rather than doc) part? — Matt Ball
Merge should give the same result as if we manually open in MS Office first document, press Ctrl+C, then open second document, go to its end and press Ctrl+V. — Roman

atott atott · Accepted Answer · 2013-12-22T17:28:20

With POI my solution is:

public static void merge(InputStream src1, InputStream src2, OutputStream dest) throws Exception {
    OPCPackage src1Package = OPCPackage.open(src1);
    OPCPackage src2Package = OPCPackage.open(src2);
    XWPFDocument src1Document = new XWPFDocument(src1Package);        
    CTBody src1Body = src1Document.getDocument().getBody();
    XWPFDocument src2Document = new XWPFDocument(src2Package);
    CTBody src2Body = src2Document.getDocument().getBody();        
    appendBody(src1Body, src2Body);
    src1Document.write(dest);
}

private static void appendBody(CTBody src, CTBody append) throws Exception {
    XmlOptions optionsOuter = new XmlOptions();
    optionsOuter.setSaveOuter();
    String appendString = append.xmlText(optionsOuter);
    String srcString = src.xmlText();
    String prefix = srcString.substring(0,srcString.indexOf(">")+1);
    String mainPart = srcString.substring(srcString.indexOf(">")+1,srcString.lastIndexOf("<"));
    String sufix = srcString.substring( srcString.lastIndexOf("<") );
    String addPart = appendString.substring(appendString.indexOf(">") + 1, appendString.lastIndexOf("<"));
    CTBody makeBody = CTBody.Factory.parse(prefix+mainPart+addPart+sufix);
    src.set(makeBody);
}

With Docx4j my solution is:

public class MergeDocx {
    private static long chunk = 0;
    private static final String CONTENT_TYPE = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";

    public void mergeDocx(InputStream s1, InputStream s2, OutputStream os) throws Exception {
        WordprocessingMLPackage target = WordprocessingMLPackage.load(s1);
        insertDocx(target.getMainDocumentPart(), IOUtils.toByteArray(s2));
        SaveToZipFile saver = new SaveToZipFile(target);
        saver.save(os);
    }

    private static void insertDocx(MainDocumentPart main, byte[] bytes) throws Exception {
            AlternativeFormatInputPart afiPart = new AlternativeFormatInputPart(new PartName("/part" + (chunk++) + ".docx"));
            afiPart.setContentType(new ContentType(CONTENT_TYPE));
            afiPart.setBinaryData(bytes);
            Relationship altChunkRel = main.addTargetPart(afiPart);

            CTAltChunk chunk = Context.getWmlObjectFactory().createCTAltChunk();
            chunk.setId(altChunkRel.getId());

            main.addObject(chunk);
    }
}

Is there any java library (maybe poi?) which allows to merge docx files? [closed]

4 Answers