Upload a file gwt

[Ousti Driss]

Hey guys,

While browsing on the internet I found a way to upload a file in a gwt app,

I managed to reimplement the code and it works just fine using formPanel,

It just happens that this file needs to be stored in a mysql database,

the problem is before the user selects the file he wants to upload, he needs to pick up two elements from 

2 combobox,

I need those informations so I can build my sql querry, How I can get those fields selected by the user 

in the  upload File servlet?

Thanks a lot,  

[Paul Robinson]

You can store the file on the server in a temporary area, returning a key to the UI. Then, when the user is ready to submit the lot, the UI sends the file's key to the server as well as the other data.

The server can then move the file data to a permanent home, or mark it as permanent.

Paul

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[Ousti Driss]

Thank you for your answer Paul,

Your solution seems logical,

but in my case these other data, I need it from the first submit,

these data are basically type of file ... 

I need it to store correctly the file in the database,

Moreover, on the client side a submit is not taken into account untill all the other data are filled.

On Wednesday, September 12, 2018 at 11:51:41 AM UTC+2, Paul Robinson wrote:

You can store the file on the server in a temporary area, returning a key to the UI. Then, when the user is ready to submit the lot, the UI sends the file's key to the server as well as the other data.

The server can then move the file data to a permanent home, or mark it as permanent.

Paul

On Wed, 12 Sep 2018, 10:06 Ousti Driss, <ousti...@gmail.com> wrote:

Hey guys,

While browsing on the internet I found a way to upload a file in a gwt app,

I managed to reimplement the code and it works just fine using formPanel,

It just happens that this file needs to be stored in a mysql database,

the problem is before the user selects the file he wants to upload, he needs to pick up two elements from 

2 combobox,

I need those informations so I can build my sql querry, How I can get those fields selected by the user 

in the  upload File servlet?

Thanks a lot,  

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[Josselin Bardet]

Hi

You can use the form input name to send informations for exemple 

Le mer. 12 sept. 2018 à 11:59, Ousti Driss <ousti...@gmail.com> a écrit :

Thank you for your answer Paul,

Your solution seems logical,

but in my case these other data, I need it from the first submit,

these data are basically type of file ... 

I need it to store correctly the file in the database,

Moreover, on the client side a submit is not taken into account untill all the other data are filled.

On Wednesday, September 12, 2018 at 11:51:41 AM UTC+2, Paul Robinson wrote:

You can store the file on the server in a temporary area, returning a key to the UI. Then, when the user is ready to submit the lot, the UI sends the file's key to the server as well as the other data.

The server can then move the file data to a permanent home, or mark it as permanent.

Paul

On Wed, 12 Sep 2018, 10:06 Ousti Driss, <ousti...@gmail.com> wrote:

Hey guys,

While browsing on the internet I found a way to upload a file in a gwt app,

I managed to reimplement the code and it works just fine using formPanel,

It just happens that this file needs to be stored in a mysql database,

the problem is before the user selects the file he wants to upload, he needs to pick up two elements from 

2 combobox,

I need those informations so I can build my sql querry, How I can get those fields selected by the user 

in the  upload File servlet?

Thanks a lot,  

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[Ousti Driss]

I founnd something similar, 

On the client side I instanciated hidden objects,

I gave them a name and for the value it's the one selected by the user,

now, on the server side, when the result is parsed, I've got a list of items, how can I check 

that an item is the hidden one ?

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[Maarten Daalder (ISAAC Software Solutions)]

In our case we place all elements to be 'uploaded' in the same FormPanel as the file input element.

Then in our servlet we first retrieve all parts (HttpServletRequest#getParts) after which we use getParameter to read out the filled in form inputs.

The file itself is retrieved via a getPart(name of input here).

[Ousti Driss]

let's say for example the user wants to upload a txt file, and he indicates that it's a data file type,

I'm interested in the keyword (String) "data", how can I add it to the formPanel?

can you give the java syntax ? 

thank you

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[Maarten Daalder (ISAAC Software Solutions)]

There is your basic

<g:FormPanel ui:field="formPanel" encoding="multipart/form-data" method="POST">

    <g:HTMLPanel>

        <g:FileUpload name="data" ui:field="dataUpload" visible="false" /><!-- not visible due to custom UI -->

        <g:RadioButton stylePrimaryName="radio-check clearfix" name="dataType" ui:field="textDataType" debugId="textDataType" text="Plain text"/>

        <g:RadioButton stylePrimaryName="radio-check clearfix" name="dataType" ui:field="binaryDataType" debugId="binaryDataType" text="Binary"/>
...

During setup/creation we programmatically assign the action via formPanel.setAction.

In the end we do a formPanel.submit() when the user clicks on the upload button.

On our servlet we have @MultipartConfig

Then our doPost:

Collection<Part> parts = request.getParts();
        try {

            checkXsrfToken(request);

            try {
                String dataType = request.getParameter("dataType");
                Part data = request.getPart("data");
                try (InputStream is = data.getInputStream()) {

                    Do your thing with the available data

                }
            } catch (... e) {
                your error handling
            }

        } finally {
            for (Part part : parts) {
                try {
                    part.delete();
                } catch (IOException e) {
                    logger.warn("Failed to delete part '{}' from server", part.getName(), e);
                }
            }
        }

[Ousti Driss]

Thank you Maarten,

I've got no more questions to ask!!