Download Excel file through Web dynpro with no windows open?

Question

Can we have a web dynpro application that just returns an Excel file in the response with no open windows? Similar to a java servlet that is used to download a Excel file?
This basically means that I cannot use wdComponentAPI.getWindowManager().createNonModalExternalWindow()
Java Servlet Code
HttpSession session = request.getSession();      // get a handle on the session id
response.setContentType("application/download");
response.setHeader("Content-Disposition", "filename=RTIS_Report.xls");
PrintWriter out = null;
out = response.getWriter();
String report = request.getParameter("REPORT");
JCO.Table lines = download(request, session, report);
for (int i = 0; i < lines.getNumRows(); i++) {
     lines.setRow(i);
     String content = lines.getString("LINES") + "\n";
     out.write(content);
     out.flush();
out.flush();
out.close();

Answer 1

Hi,
I think you can use IWD Cached Web Resource to achieve this..
See the below code FYI..
public void downloadToExcel( )
    String fileName = "Customer" + ".xls";
     IWDCachedWebResource cachedExcelResource = null;
     try
          File f = new File("Customer.xls");
          WritableWorkbook workbook =   Workbook.createWorkbook(f);
          WritableFont black = new WritableFont(WritableFont.createFont("Trebuchet MS"),WritableFont.DEFAULT_POINT_SIZE,WritableFont.BOLD,false,UnderlineStyle.SINGLE,Colour.BLACK);
          WritableCellFormat blackFormat = new WritableCellFormat(black);
          WritableFont blue = new WritableFont(WritableFont.createFont("Trebuchet MS"),WritableFont.DEFAULT_POINT_SIZE,WritableFont.NO_BOLD,false,UnderlineStyle.NO_UNDERLINE,Colour.BLUE);
          WritableCellFormat blueFormat = new WritableCellFormat(blue);
          WritableSheet sheet = workbook.createSheet("Customer", 0);
               Label label;
               String[] header={"Corporate Code","Batch ID"};
               for (int i=0;i<2;i++)
                    label = new Label(i,0,header<i>.toString(),blackFormat);
                    sheet.addCell(label);
               WritableCellFormat integerFormat = new WritableCellFormat(NumberFormats.INTEGER);
               jxl.write.Number number;
               // Reading the contents
               for(int i=0;i<wdContext.nodeVn_DownloadToExcel().size();i++)
                    String strCorpName = wdContext.currentContextElement().getVa_CorpCode();
                    String strBatchID =     wdContext.nodeVn_DownloadToExcel().getVn_DownloadToExcelElementAt(i).getVa_BatchID();
                    label = new Label(0,i+1,strCorpName,blueFormat);
                    sheet.addCell(label);
                    label = new Label(1,i+1,strBatchID,blueFormat);
                    sheet.addCell(label);
               workbook.setColourRGB(Colour.LIME, 0xff, 0, 0);
               workbook.write();
               FileInputStream excelCSVFile = new FileInputStream(f);
               IWDCachedWebResource cachedWebResource = null;
               if (excelCSVFile!= null)
                    cachedWebResource = WDWebResource.getWebResource(excelCSVFile, WDWebResourceType.getWebResourceType("xls","application/ms-excel"));
               cachedWebResource.setResourceName(fileName);
          cachedExcelResource = cachedWebResource;
          wdContext.currentContextElement().setVa_DownloadToExcel(cachedExcelResource.getURL());
          workbook.close();
     catch (Exception ex)
          wdComponentAPI.getMessageManager().reportException("Error in Excel Download"+ex.getMessage(),false);
Regards,
Vijay