Spring file upload in a mixed form

Question

I want to upload a file to my spring 3.0 applicatoin (created with roo).

I already have the following entity:

@Entity
@RooJavaBean
@RooToString
@RooEntity
public class SelniumFile {

    @ManyToOne(targetEntity = ShowCase.class)
    @JoinColumn
    private ShowCase showcase;

    @Lob
    @Basic(fetch = FetchType.LAZY)
    private byte[] file;

    @NotNull
    private String name;
}

But I am not sure how to implement it on the view/controller side. Can I freely mix spring-form tags like <form:input> with normal tags like <input type=file ...>?

I have seen the nice multipart upload section in the MVC-Documentation but still need a little help to apply it to my specific case.

Answer 1

I don't believe you can mix-and-match file uploads with normal forms (in Spring MVC, at least), because file upload forms use the multipart/form-data encoding, rather than the usual application/x-www-form-urlencoded.

When you specify multipart/form-data, then in Spring you need to use a MultipartResolver implementation (as mentioned in the Spring docs you linked to), and all parameter decoding must go through that. Spring MVC will not be able to decode the normal form inputs, since all fields will be encoded along with the uploaded file.

It's almost certainly easier to use two separate forms, one for the normal stuff, one for the file upload.

Answer 2

If you are using Spring 3.0 then you can create a Converter and a Formatter(optional) And you won't have to use the initBinder method, and keep things more POJO, but your solution is still very valid and still quite clean.

Answer 3

See https://jira.springsource.org/browse/ROO-442 for the related Roo issue.

Answer 4

I also have the same problem as you. I will try to solve it with your problem but i still not clear that in the view, what do you choose to use in your code? input type="file" or spring form tag?

Because when i use input tag, spring roo can not pass the model. It shows the error like " Failed to invoke handler method [public void egat.spring.roo.ptu.io.web.ImportExcelController.post(java.lang.Long,org.springframework.ui.ModelMap,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [id] in @RequestMapping "

Could you please explain to me ?

Thank you very much.

Answer 5

I have a simple blog entry on how to handle Spring Multipart Form Upload, which might be helpful.