File upload - formBackingObject called before onSubmit!

[pir8ped]

Hi,

I am uploading image files in my webapp, but the images are not being displayed until I refresh the page. Looking at the debugger, I see that when the submit button is hit, formBackingObject in my controller is being called, then onSubmit.

Here's my JSP including the upload form:

<form name="form1" enctype="multipart/form-data" method="post" action="" >
        <p></p>
        <table width="75%" border="1">
          <tr> 
            <td><input name="file" type="file"> </td>
             <c&#58;if test="$&#123;photoInfo.numPhotos > 0&#125;">             
			<td> Replace&#58;  <select name="replace">
				<c&#58;if test="$&#123;!&#40;photoInfo.numPhotos == 3&#41;&#125;">
                	<option value="0">Don't replace</option> 
                </c&#58;if>
                <c&#58;forEach items="$&#123;photoInfo.photoList&#125;"  var="photo" varStatus="varStatus">              
                	<option  value="<c&#58;out value="$&#123;photo.photoID&#125;"/>" >$&#123;varStatus.index + 1&#125;</option> 
                </c&#58;forEach>                  
                </select>
            </td>
            </c&#58;if>
          </tr>
        </table>
        <p> 
          <input type="submit"  value="Upload Photo">
      </form>
      <c&#58;if test="$&#123;photoInfo.numPhotos > 0&#125;">    
      <table width="100%" border="1" cellpadding="5" cellspacing="5">
      	<tr> 
      	<c&#58;forEach items="$&#123;photoInfo.photoList&#125;"  var="photo" varStatus="varStatus"> 
      		<td> 
            <p><img src="<c&#58;out value="$&#123;photo.filePath&#125;"/>" width="<c&#58;out value="$&#123;photo.imageWidth&#125;"/>" height="<c&#58;out value="$&#123;photo.imageHeight&#125;"/>"> 
            </p>
            <p>Photo <c&#58;out value="$&#123;varStatus.index + 1&#125;"/></p>
          	</td> 
     	</c&#58;forEach>  
        </tr>
      </table>        
	  </c&#58;if>

My controller:

public class PhotoUploadController extends SimpleFormController{

      private PhotoHandler photoHandler;

    protected ModelAndView onSubmit(HttpServletRequest request,
            HttpServletResponse response, Object command, BindException errors)
            throws ServletException, IOException {

        // cast the bean
        PhotoInfo photoInfo = (PhotoInfo) command;
        String userName = (String) request.getSession(false).getAttribute(
                "userName");
    
        int photoIDOfPhotoToReplace = RequestUtils.getIntParameter(request,
        "replace", 0);
        String fileName = photoInfo.getFile().getOriginalFilename();
        byte[] file = photoInfo.getFile().getBytes();
        String newFileName = new String(PhotoHandler.getTempImageDirectory()+ "/"
                + userName + "_" + fileName);
        BufferedOutputStream bos = new BufferedOutputStream(
                new FileOutputStream(newFileName));
        bos.write(file);
        bos.flush();
        bos.close();
        boolean fileHandledOK = photoHandler.handleNewFile(userName,
                newFileName, photoIDOfPhotoToReplace);
        if (fileHandledOK)
            return new ModelAndView(getSuccessView());
        else {
            photoInfo.setActionMessage("Sorry, the upload failed, please try again.");
            return new ModelAndView(getFormView());
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.web.servlet.mvc.AbstractFormController#formBackingObject(javax.servlet.http.HttpServletRequest)
     */
    protected Object formBackingObject(HttpServletRequest request)
            throws Exception {
        String userName = (String) request.getSession(false).getAttribute(
                "userName");
        PhotoInfo photoInfo = new PhotoInfo();
        List photoList = photoHandler.getPhotosDAO().getAllPhotos(userName);
        photoInfo.setPhotoList(photoList);
        return photoInfo;
    }
...

Can anyone suggest what might be causing this strange behaviour?

Thanks,

John Pedersen

[katentim]

Take a look at the workflow for AbstractFormController and SimpleFormController

[pir8ped]

Thanks for the hint - don't know how I overlooked that.

John