Help with file upload

[dissectcode]

Hi - I have spent 8 days following tutorials and blogs and tried everything. I have this code below...but the command object in the onSubmit method is always null and I don't know why the file isn't being sent by Extjs... Please help

I am using extjs 3 :

createFileUpload = function()
{
    var URL = "filePreview.do";
        
        myuploadform= new Ext.FormPanel({
                fileUpload: true,
                width: 250,
                autoHeight: true,
                bodyStyle: 'padding: 10px 10px 10px 10px;',
                labelWidth: 50,
                items:[
                {
                    xtype: 'fileuploadfield',
                    id: 'filedata',
                    emptyText: 'Select a document to upload...',
                    fieldLabel: 'File',
                    buttonText: 'Browse'
                }],
                buttons: [{
                    text: 'Preview',
                    handler: function(){
               
                        if(myuploadform.getForm().isValid()){
                            form_action=1;
                            myuploadform.getForm().submit({
                                url: URL,
                                waitMsg: 'Uploading file...',
                                headers: {'Content-type':'multipart/form-data'},
                                success: function(form,action){
                                    alert('Success', 'Processed file on the server');
                                },
                                failure: function() { alert("this failed too."); }
                            });
                        }
                    }
                }]
            })
            
          return myuploadform;
}

I have a large form of ~50 items and I am trying to add this Extjs file upload field, with a "preview" button to open the file for verification (requested by the customer). So far I am just trying to save the file I select; I have not implemented the GET part of the preview yet.

I am using Java 6 with Spring 2.0.8.

Bean #1 :

package beans;


import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectOutputStream;


import org.springframework.web.multipart.MultipartFile;


public class FilePreviewBean
{        
    private MultipartFile file;
    
    public void setFile( MultipartFile file )
    {
        this.file = file;
    }
    
    public MultipartFile getFile()
    {
        return file;
    }
}

The controller bean :

package controller;

public class FilePreviewController extends SimpleFormController
{
    
    public FilePreviewController()
    {
    }
    
    protected ModelAndView onSubmit( HttpServletRequest request, HttpServletResponse response, Object command, BindException errors ) throws ServletException, IOException 
    {
// cast the bean
        FilePreviewBean fp = (FilePreviewBean)command;    
        MultipartFile file = fp.getFile();
        


        if( file == null )   // <------------- IT'S ALWAYS NULL ?!
        {
              System.out.println("The file was null.");
             return null;
        }
        else
        {
                // print/return an error
                return null;
         }
    }
    
    protected void initBinder( HttpServletRequest request, ServletRequestDataBinder binder ) throws ServletException
        {
//binder.registerCustomEditor( byte[].class, new ByteArrayMultipartFileEditor() );
        binder.registerCustomEditor(String.class, new StringMultipartFileEditor());
    }


}

And the bean definitions :

    <bean id="multiPartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
        
    <bean id="filePreviewController" class="controller.FilePreviewController"> 
        <property name="commandClass" value="cbeans.FilePreviewBean"/>
        <property name="formView" value="fileuploadform"/>
    </bean>

I can see that the bean is called from my preview button. The setFile() method should apparently be called automatically by Spring MVC but when I call getFile() it always returns null.

I was trying to follow this : http://static.springsource.org/sprin...#mvc-multipart

and it makes a lot of sense; but I have no idea what to do to make the file not equal null!? Please help

[mitchellsimoens]

So is the request being sent to upload?

[dissectcode]

So is the request being sent to upload?

by the time it go to onSubmit() the "Object command" is null. I don't know where the disconnect is.