How to get file name from CosMultipartResolver

I have been using the org.springframework.web.multipart.cos.CosMultipart Resolver and binding the file bytes to a command class with initBinder e.g. binder.registerCustomEditor(byte[].class, new ByteArrayMultipartFileEditor());

This gets me the file bytes, but I also need the file name. Is there are way to do this? I tried subclassing ByteArrayMultipartFileEditor and can reference the file name, but not sure how to make it accessible in onSubmit(Object command) method. Thanks

I use the commons multipart file resolver (make sure you have commons-fileupload.jar in your classpath):-

Code:

---

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

---

MyCommand object:-

Code:

---

import org.springframework.web.multipart.MultipartFile;

...snip...

/**
 * Sets the image
 *
 * @param image The image
 */
public void setImage(MultipartFile image)
{
    this.image = image;
}
   
/**
 * Retrieves the image
 *
 * @return The image
 */
public MultipartFile getImage()
{
    return (image);
}

---

MultipartFilePropertyEditor:-

Code:

---

/*
 * MPSC-Spring - A library of common code to use with the Spring framework
 *
 * Copyright 2005 Matt Parker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package uk.co.mpcontracting.modules.spring.support;

import java.beans.PropertyEditorSupport;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.web.multipart.MultipartFile;

/**
 * An implementation of <code>java.beans.PropertyEditor</code> that supports a Spring
 * multipart file
 *
 * @author Matt Parker (matt@mpcontracting.co.uk)
 */
public class MultipartFilePropertyEditor extends PropertyEditorSupport
{
    private static Log log = LogFactory.getLog(MultipartFilePropertyEditor.class);
   
    /**
    * Sets the multipart file into the property editor
    *
    * @param value The multipart file
    */
    public void setValue(Object value)
    {
        if (log.isDebugEnabled())
        {
            if (value != null)
            {
                log.debug("Object = " + value.getClass().getName());
            }
            else
            {
                log.debug("Object = null");
            }
        }
       
        if (value instanceof MultipartFile)
        {
            super.setValue(value);
        }
        else if (value != null)
        {
            log.error("Object is not a multipart file - " + value.getClass().getName());
        }
    }

    /**
    * Overrides the set as text method so no exceptions are thrown
    *
    * @param text The text
    * @throws IllegalArgumentException If either the String is
    * badly formatted or if this kind of property can't be expressed
    * as text
    */
    public void setAsText(String text) throws IllegalArgumentException
    {
        return;
    }
   
    /**
    * Retrieves a textual representation of the multipart file from the property editor
    *
    * @return A textual representation of the multipart file
    */
    public String getAsText()
    {
        Object value = getValue();
       
        if (value != null)
        {
            return (((MultipartFile)value).getOriginalFilename());
        }
       
        return ("");
    }
}

---

In initBinder:-

Code:

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binder.registerCustomEditor(MultipartFile.class, new MultipartFilePropertyEditor());

---

In my form controller:-

Code:

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MyCommand myCommand = (MyCommand)command;

MultipartFile image = myCommand.getImage();
String fileName = image.getOriginalFilename()

---

HTH,

Bob

Hi Bob,

when is the function setImage() of your command class called ???

4had

Quote:

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Originally Posted by 4had

Hi Bob,

when is the function setImage() of your command class called ???

4had

---

Spring will call it when the file is uploaded. The command class is registered as the command of the form controller.

So in my JSP I'd have an <input type="file" name="image"> and the file will end up in the command object - it's translated from the raw bytes by Spring because I've registered the MultipartFilePropertyEditor in initBinder.

Then in your validate method you'd have:-

Code:

---

public void validate(Object obj, Errors errors)
{
    MyCommand myCommand = (MyCommand)obj;

    MultipartFile image = myCommand.getImage();
    String fileName = image.getOriginalFilename();

    ...validate the filename here
}

---

Bob

Ok, now I understand.

Thank you.