File attachment using Adf faces, EJB3 and Oracle XE database Part IV

continued...
Downloading file


In download button, add FileDownloadActionListener and select fileDownloadActionListener from backingBean



The binding of attachment page should looks like above.

Following is the code in AttachmentBackingBean



public void downloadAction(FacesContext facesContext, OutputStream outputStream) {
    Attachment att = (Attachment)attachmentList.getSelectedRowData();
    ExternalContext ectx = facesContext.getExternalContext();
    String fileName = null;
    byte[] contents = null;
    if (att == null) {
        return;
    } else if (att.getAttachmentId() == null) {
      fileName = att.getFileName();
      contents = att.getFileContent();
    } else {
      OperationBinding oper = getBindings().getOperationBinding("findAttachmentById");
      oper.getParamsMap().put("attachmentId", att.getAttachmentId());
      Attachment attachment = (Attachment)oper.execute();
      fileName = attachment.getFileName();
      contents = attachment.getFileContent();
    }

    BlobDomain content = new BlobDomain();
    content.setBytes(contents);
    Long length = content.getLength();

    HttpServletResponse response = (HttpServletResponse)ectx.getResponse();
    response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\"");
    response.setContentLength(length.intValue());
    try {
        InputStream in = content.getBinaryStream();
        byte[] buf = new byte[1024];
        int count;
        while ((count = in.read(buf)) >= 0) {
            outputStream.write(buf, 0, count);
        }

        in.close();
        outputStream.flush();
        outputStream.close();
        facesContext.responseComplete();

    } catch (IOException ex) {
        System.out.println(ex.getMessage());
        ex.printStackTrace();
    }
  }

Your binding of attachment page should be like this.

Deleting File


On delete File button, provide the actionListener and bellow is the code for actionListener

public void deleteFile(ActionEvent actionEvent) {
     Attachment attachment = (Attachment)attachmentList.getSelectedRowData();
     if ( attachment != null ) {
       List  attachments = (List)AdfFacesContext.getCurrentInstance().getPageFlowScope().get("attachmentList");
       attachments.remove(attachment);
       AdfFacesContext.getCurrentInstance().addPartialTarget(attachmentList);
     }
  }

You can download the source from FileUploadDemoBlog.zip

I would like to say special thanks to my team members specially Pino and Owie for their support.

I will appreciate anyone who comments and let me know the more appropriate way for doing the same task.