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Using Assembler Service in AEM Forms

This article provides you the assets for demonstrating the ability to drag and drop multiple PDF files into the browser and save the assembled pdf file to your file system. The following is the code for the servlet which assembles the pdf files uploaded using the browser.
protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) {
        log.debug("In Assemble Uploaded Files");
 
        Map<String, Object> mapOfDocuments = new HashMap<String, Object>();
        final boolean isMultipart = org.apache.commons.fileupload.servlet.ServletFileUpload.isMultipartContent(request);
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = null;
        try {
            docBuilder = docFactory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        org.w3c.dom.Document ddx = docBuilder.newDocument();
        Element rootElement = ddx.createElementNS("http://ns.adobe.com/DDX/1.0/", "DDX");
 
        ddx.appendChild(rootElement);
        Element pdfResult = ddx.createElement("PDF");
        pdfResult.setAttribute("result", "GeneratedDocument.pdf");
        rootElement.appendChild(pdfResult);
        if (isMultipart) {
            final java.util.Map<String, org.apache.sling.api.request.RequestParameter[]> params = request
                    .getRequestParameterMap();
            for (final java.util.Map.Entry<String, org.apache.sling.api.request.RequestParameter[]> pairs : params
                    .entrySet()) {
                final String k = pairs.getKey();
 
                final org.apache.sling.api.request.RequestParameter[] pArr = pairs.getValue();
                final org.apache.sling.api.request.RequestParameter param = pArr[0];
 
                try {
                    if (!param.isFormField()) {
                        final InputStream stream = param.getInputStream();
                        log.debug("the file name is " + param.getFileName());
                        log.debug("Got input Stream inside my servlet####" + stream.available());
                        com.adobe.aemfd.docmanager.Document document = new Document(stream);
                        mapOfDocuments.put(param.getFileName(), document);
                        org.w3c.dom.Element pdfSourceElement = ddx.createElement("PDF");
                        pdfSourceElement.setAttribute("source", param.getFileName());
                        pdfSourceElement.setAttribute("bookmarkTitle", param.getFileName());
                        pdfResult.appendChild(pdfSourceElement);
                        log.debug("The map size is " + mapOfDocuments.size());
                    } else {
                        log.debug("The form field is" + param.getString());
 
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
 
            }
        }
 
        com.adobe.aemfd.docmanager.Document ddxDocument = documentServices.orgw3cDocumentToAEMFDDocument(ddx);
        Document assembledDocument = documentServices.assembleDocuments(mapOfDocuments, ddxDocument);
        String path = documentServices.saveDocumentInCrx("/content/ocrfiles", assembledDocument);
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("path", path);
            response.setContentType("application/json");
            response.setHeader("Cache-Control", "nocache");
            response.setCharacterEncoding("utf-8");
            PrintWriter out = null;
            out = response.getWriter();
            out.println(jsonObject.toString());
 
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
 
    }
 
}


To get this capability working on your AEM Server
Make sure your AEM Forms install is complete. All your bundles need to be in active state.
Make sure you have added - Boot delegate RSA and BouncyCastle libraries as mentioned in this Installing AEM Forms
Caveats for this Demo