Cannot upload file using web flow

[mcsenter]

I am having trouble getting files to upload using Spring Web Flow. (My background: Java - advanced, Spring - intermediate, Web Flow - novice.) Whenever I put

enctype="multipart/form-data"

into my form on my jsp, Web Flow isn't getting called. Here is my jsp:

<%@ include file="../includes/header.jsp" %>

<%@ include file="includes/menu.jsp" %>

<form name="uploadForm" action="memberPhotos.html" method="post" enctype="multipart/form-data">
	<input type="hidden" name="_flowExecutionId" value="$&#123;flowExecutionId&#125;" />
	<table>
		<tbody>
			<tr>
				<td colspan="2">
					<input type="hidden" name="isPrimary" value="$&#123;isPrimary&#125;" />
					<input type="file" name="photoFile" width="75" />
				</td>
			</tr>
			<tr>
				<td>
					<input type="submit" name="_eventId_cancel" value="Cancel" />
				</td>
				<td>
					<input type="submit" name="_eventId_upload" value="Upload Photo" />
				</td>
			</tr>
		</tbody>
	</table>
</form>

<%@ include file="../includes/footer.jsp" %>

Here are the pertinent parts of my flow.xml:

	<view-state id="upload.photo.view" view="member/member.Profile.photos.upload.view">
		<entry>
			<action bean="photos.formAction" method="setupForm" />
		</entry>
		<transition on="upload" to="uploadPhoto" />
		<transition on="cancel" to="photos.view" />
	</view-state>
	
	<action-state id="uploadPhoto">
		<action bean="photos.upload.formAction" method="uploadPhoto"/>
		<transition on="success" to="photos.view" />
		<transition on="error" to="upload.photo.view" />
	</action-state>

As you can see, I am not using the binding method because I want to check attributes of the file (such as contentType) and binding afaik will only put the content into a byte array, which tells me nothing about the file other than its size and content.

Here is my code for handling the upload:

public class UploadPhotoFormAction extends ServiceAwareWebFlowFormAction {
	public Event uploadPhoto(RequestContext context) throws Exception {
		System.err.println("uploading photo!");
		Object source = context.getLastEvent().getSource();
		System.err.println("source = " + source);
		if (!(source instanceof MultipartHttpServletRequest)) {
			System.err.println("returning error!");
			return error();
		}
		User user = (User) getFormObject(context);
		System.err.println("user = " + user);
		user = service.getUserByUsername(user.getUsername());
		Boolean isPrimary = Boolean.valueOf((String) context.getRequestScope().getRequiredAttribute("isPrimary"));
		System.err.println("isPrimary = " + isPrimary);
		MultipartHttpServletRequest request = (MultipartHttpServletRequest) source;
		Iterator fileNames = request.getFileNames();
		if (fileNames.hasNext()) {
			String fileName = (String) fileNames.next();
			System.err.println("fileName = " + fileName);
			MultipartFile file = request.getFile(fileName);
			Photo photo = new Photo();
			photo.setContent(file.getBytes());
			photo.setCroppedContent(file.getBytes());
			photo.setHeight(0);
			photo.setMimeType(file.getContentType());
			photo.setSize(file.getSize());
			photo.setUploadDate(GregorianCalendar.getInstance());
			photo.setWidth(0);
			photo.setPrimaryPhoto(isPrimary);
			user.getActiveProfile().addPhoto(photo);
		}
		getService().saveUser(user);
		return success();
	}

}

Also, it's a given, but here's my CommonsMultipartResolver config and viewlistener config:

	<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize"><value>1048576</value></property>
	</bean>

	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
		<property name="prefix"><value>/jsp/</value></property>
		<property name="suffix"><value>.jsp</value></property>
	</bean>

I find that as long as I submit with the "enctype="multipart/form-data"" attribute in the form element, the page does NOT get handled by the Web Flow controller. I know this because the debugging "System.err.println"s never show up in the logs. Now, if I removed the "enctype="multipart/form-data"" attribute, the form submits and is handled by Web Flow, but of course it knows nothing about the file since the form is no longer a multipart form.

So to conclude, having a "enctype" attribute in the form causes the Web Flow controller to be skipped. Removing "enctype" sends the post through Web Flow but does nothing with the file. Can anyone help?

[klr8]

Strange. I suggest you try to get the FileUpload sample application that comes with SWF PR5 up and running. That demonstrates a file upload scenario handled by SWF.

Erwin

[mcsenter]

Yes, I have the fileupload sample up and running, but again, it's binding the file to a byte array...which is not what I want to do. I'm trying to tinker with some of the eventIds and such to see if there's something causing a problem in there...

[klr8]

Okay, so in the case of the FileUpload sample the multipart form (with enctype) is posting correctly to the SWF controller and being processed by SWF. Maybe you can put a breakpoint in the SpringMVC DispatcherServlet to figure out why it is not delegating to the SWF FlowController for your multipart HTML form.

Erwin

[mcsenter]

Wow, my first post on the forum and I have to go an make a newbie mistake. :oops: After a lot of debugging I finally realized the problem was in my multipartResolver bean registration.... I left out this:

id="multipartResolver"

ugh...how stupid...

Thanks for taking a look klr8. So far, I like web flow!

[dinhdv]

Sorry but i can a question.
How can getRealPath of image when browse file in case?

Thank!