Using File Download Control with Java Bean in XPages - xpages

Question

I would like to use the standard XPages xp:fileDownload control and bind it to a Java Bean rather than a document source.
I have an RTF field in my form - 'resourceAttachments' - along with several other fields in which in which I will be storing several attachments and nothing else.
Can anyone provide me with an example or point me to some documentation. I have a similar requirement for the xp:uploadControl, I can find samples which create a new document, but I am struggling to implement adding and saving to existing documents, I guess I should post another question for that though, but as the two go together I thought I would at least mention it here.
Many thanks.
Mark
public class TrainingModule implements Serializable {
private static final long serialVersionUID = -6998234266563204541L;
private String description;
private ???? resourceAttachments; --something here ??
private String unid;
public TrainingModule() {
String documentId = ExtLibUtil.readParameter(FacesContext.getCurrentInstance(), "key");
if (StringUtil.isNotEmpty(documentId)) {
load(documentId);
}
}
public String getUnid() {return unid;}
public void setUnid(final String unid) {this.unid = unid;}
public String getDescription() {return description;}
public void setDescription(final String description) {this.description = description;}
? Some attachment Getter & Setter here??
public void load(final String unid) {setUnid(unid);{
Document doc = null;
try {
doc = ExtLibUtil.getCurrentDatabase().getDocumentByUNID(getUnid());
setDescription(doc.getItemValueString("Description"));
??Some load here here??
} catch (Throwable t) { t.printStackTrace();
} finally {
try {
doc.recycle();
?some other recycle here?
} catch (Exception ) {
// Fail Silent
}
}
In my Custom Control amongst other things I have...
<xp:this.beforePageLoad><![CDATA[#{javascript:if(param.containsKey("key"))
{viewScope.put("docAttach",(param.get("key")));}}]]></xp:this.beforePageLoad>
.......
<xp:fileDownload rows="30" id="fileDownload2" displayLastModified="false"
value="#{TrainingModule.ResourceAttachments}" hideWhen="true" allowDelete="true">
</xp:fileDownload>

Answer 1

I have dealt a similar problem last year. I haven't looked for an appropriate binding for fileUpload. Instead, I used a different approach.
When you submit an XPage with a file upload, it will upload the file to the disk (regardless of any binding) and create an com.ibm.xsp.http.UploadedFile object in the requestMap. So you can grab it from a bean method and do the magic.
This is the IBM Connect 2014 demo and I have used this technique to upload file into the BaseCamp.
XSP code is simple (here is the Github repo)
<xp:fileUpload id="fileUpload1"></xp:fileUpload>
<xp:button id="button1"
value="Upload Local File">
<xp:eventHandler event="onclick"
submit="true" refreshMode="complete">
<xp:this.action>
<xp:executeScript
script="#{bcs.uploadLocalFile}">
</xp:executeScript>
</xp:this.action>
</xp:eventHandler>
</xp:button>
bcs is the managed bean and here is the code snippet for upload (from Github repo)
public void uploadLocalFile() {
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
String fileUploadID = ExtLibUtil.getClientId(facesContext, facesContext.getViewRoot(), "fileUpload1", false);
UploadedFile uploadedFile = ((UploadedFile) request.getParameterMap().get(fileUploadID));
if (uploadedFile == null) {
facesContext.addMessage("messages1", new FacesMessage(FacesMessage.SEVERITY_ERROR, "No file uploaded. Use the file upload button to upload a file.", ""));
return;
}
java.io.File file = uploadedFile.getServerFile();
String contentType=uploadedFile.getContentType();
String fileName = uploadedFile.getClientFileName();
// removed unrelated code...
}
So, basically, you get the requestMap. The UploadedFile object refers to a file object that has been uploaded to a temporary area on the server and it's mapped with the clientId of the fileUpload component.
After this point, you might create a stream and attach the file into a field. When you bind it to a field, document wrapper does the same thing, I guess.