PDF file downloading from server to client

Question

Hello,
I am a newbie to Oralce UCM. Writing a component to merge some PDF files and allow user to save/open it on client side.
The file downloaded is of 0 bytes and when opened it says -
Adobe Reader could not open the the file because it is either not a suppported file type or because the file is damaged(It was sent as an email attachment and was not correctly decoded)
this.m_binder.m_contentType = "application/pdf";
this.m_binder.m_clientEncoding = "utf-8";
DataStreamWrapper dataStreamWrapper = this.createNewDownloadStream();
dataStreamWrapper.m_clientFileName = "MergedPDF";
dataStreamWrapper.m_inStream = mergedPDF.getDocumentInputStream();
dataStreamWrapper.m_inStreamActive = true;
dataStreamWrapper.m_dataType = "application/pdf";
try {
this.m_httpImplementor.sendStreamResponse(this.m_binder, dataStreamWrapper);
} catch (ServiceException e) {
e.printStackTrace();
Some clue would really help :)
Thanks,
Fauzia

Answer 1

Hi Jiri,
I have created and HCSP page where data is being populated dynamically. User may select some of the files from this page through checkbox. Page also has a download button which when clicked will merge all the selected documents and let the user open/save it.
Information like Native URL, docName is passed on to the content server when the component is called (download button-click).
Merging the PDFs, I have used a custom utility which takes url as a parameter and returns back the inputstream of merged PDF.
And last, I have used DataStreamWrapper to send this inputstream back to the client as an attachment which can be read by IE.
Also, I thought at first to use HTTPHeader where parameters like content-disposition, content-type can be set. But UCM already provides a better way to achieve this i.e. through DataStreamWrapper.
public class MergePDF extends Service {
     public List<PdfDocumentSource> createPdfDocumentSourceList(
               String... urlStrings) throws MalformedURLException {
          List<PdfDocumentSource> sourceList = new ArrayList<PdfDocumentSource>(
                    urlStrings.length);
          for (String url : urlStrings) {
               URL urlDoc = new URL(url);
               PdfDocumentSource pdfSource = new UrlPdfDocumentSource(urlDoc);
               try {
                    System.out.println("URL in create method - "+urlDoc);
                    System.out.println("PDFSource input stream - "+pdfSource.getDocumentInputStream().available());
               } catch (IOException e) {
                    e.printStackTrace();
               sourceList.add(pdfSource);
          return sourceList;
     public void mergeAll() throws DataException, ServiceException {
          Properties property = this.m_binder.getLocalData();
          String urlStrings = "";
          List<PdfDocumentSource> sourceList;
          PdfDocumentSource mergedPDF = null;
          urlStrings = property.getProperty("webURL");
          String[] urls = urlStrings.split(";");
          try {
               sourceList = createPdfDocumentSourceList(urls);
               PdfMerge merge = new PdfMerge(sourceList, true);
               try {
                    mergedPDF = merge.createMergedPdf();
                    transferToClient(mergedPDF);
               } catch (PdfProcessingException e) {
                    e.printStackTrace();
          } catch (MalformedURLException e) {
               e.printStackTrace();
          System.out.println("hello123");
          System.out.println("URLS - "+urlStrings);
     public void transferToClient(PdfDocumentSource mergedPDF){
          this.m_binder.m_contentType = "application/pdf";
          this.m_binder.m_clientEncoding = "utf-8";
          DataStreamWrapper dataStreamWrapper = this.createNewDownloadStream();
          dataStreamWrapper.m_clientFileName = "MergedPDF.pdf";
          dataStreamWrapper.m_inStream = mergedPDF.getDocumentInputStream();
          //dataStreamWrapper.m_inStreamActive = true;
          dataStreamWrapper.m_dataType = "application/pdf";
          try {
               this.m_httpImplementor.sendStreamResponse(this.m_binder, dataStreamWrapper);
          } catch (ServiceException e) {
               e.printStackTrace();
          * StringBuffer sb = this.createHttpResponseHeader();
          sb.append("Content-Type: application/pdf");
          sb.append("Content-Disposition: attachment; filename=fname.ext");
          //m_headerStr
          this.m_headerStr = sb.toString();
}